WO2013045308A1 - Laser soldering of silicon carbide-based materials - Google Patents
Laser soldering of silicon carbide-based materials Download PDFInfo
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- WO2013045308A1 WO2013045308A1 PCT/EP2012/068302 EP2012068302W WO2013045308A1 WO 2013045308 A1 WO2013045308 A1 WO 2013045308A1 EP 2012068302 W EP2012068302 W EP 2012068302W WO 2013045308 A1 WO2013045308 A1 WO 2013045308A1
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- silicon carbide
- based materials
- sic
- laser
- critical defects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/005—Soldering by means of radiant energy
- B23K1/0056—Soldering by means of radiant energy soldering by means of beams, e.g. lasers, E.B.
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3607—Silica or silicates
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
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Definitions
- path energy should be varied depending on the gap size to get the best possible soldering result.
- the laser beam soldering is preferably carried out at a temperature of 1200 ° C to 1850 ° C.
- pretreatment for example, metallization
- mechanical tools for example degreasing or dedusting.
- Lotzusannnnener one with the constituents contained in the ceramic base material of compounds or elements SiC and / or Si and / or C is used.
- a powder of a solder composition is formed, worked up this powder with an organic binder in pasty form or as a suspension and the sections or parts or joining gaps of the molded body to be soldered coated over the entire surface with the resulting paste or suspension or inserted into the joint gap.
- the powder of a solder composition is processed into compacts and the compacts are locally melted on the portions or parts or joining gaps of the parts to be soldered by the action of a laser or lasers.
- a temperature of at least 1200 ° C. is preferably achieved by the laser light at the section edges and in the joint gap.
- the silicon carbide-based materials whose critical defects are to be corrected by laser beam soldering are preferably selected from silicon carbide ("PLS-SiC”) silicon-infiltrated silicon carbide (“SiSiC” or “RBSC”), porous recrystallized silicon carbide (“RSiC”). ); Graphite silicon (“C-SiC”), which consists of graphite and is coated with a layer of SiC; the SiC / SiC composites, for example with fibers or whiskers, the C / SiC composites, for example with fibers or Carbon and SiC whiskers, the SiC single crystals, the SiC composites with another ceramic, for example SiC / Si3N and SiC / TiN composites. It is preferable that the silicon carbide based materials have a
- the crack is milled along the crack course with a hand mill to a depth, depending on crack depth and size, from 1 -2 mm. In this milling groove, the solder is carefully filled to avoid blistering.
- the component is placed in an evacuated chamber and the solder pressed by briefly applying vacuum and pressure in the gap. Then the crack course is filled up to 1 mm supernatant with the solder.
- 2 laser of wavelength 10.6 ⁇ is under a protective gas atmosphere, and a maximum power of 700 W the crack path traced by means of a CO.
- the laser light reaches a temperature> 1420 ° C in the plate edges and in the gap and it comes to the melting of the silicon, the simultaneous onset of reaction of silicon with carbon in an exothermic reaction to form SiC. Due to the additional heat that is formed by the reaction, a heating also takes place in the depth of the gap and the plate edges.
- the crack is then
Abstract
Disclosed is a method for repairing critical flaws in silicon carbide-based materials, wherein a laser or two combined laser sources are used for reactively soldering in a bonding manner by feeding silicon carbide powder or a mixture of silicon, carbon and silicon carbide powder.
Description
Laserstrah Nöten von Materialien auf Siliciumkarbidbasis Laser beam needs of silicon carbide based materials
Gegenstand der Erfindung ist ein Verfahren zum Laserstrahllöten zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis. The invention relates to a method for laser beam soldering for the correction of critical defects of silicon carbide based materials.
Das technische Gebiet der Erfindung kann als Reaktivlöten bezeichnet werden, das heißt dass Temperaturen von mehr als 1200°C zur Anwendung kommen, was ermöglicht, den hergestellten Verbund dort einsetzen zu können, wo die The technical field of the invention can be referred to as reactive soldering, that is to say that temperatures of more than 1200 ° C. are used, which makes it possible to use the composite produced where the
Temperaturen zum Beispiel 900°C überschreiten und bis 1600°C oder sogar darüber hinaus gehen. Temperatures, for example, exceed 900 ° C and go up to 1600 ° C or even beyond.
Aufgrund der hohen Temperaturen - zum Beispiel um 1000°C - denen Keramiken wie beispielsweise das SiSiC ausgesetzt sein können, ist die Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis durch Klebung mit organischen Produkten ausgeschlossen. Due to the high temperatures - for example around 1000 ° C - which may be exposed to ceramics such as SiSiC, the elimination of critical defects of silicon carbide based materials by adhesion with organic products is excluded.
Stand der Technik ist es, SiSiC Keramiken mittels Laserschneiden zu bearbeiten. Thermisches Abtragen mit Laserstrahlen wird als Abtrennen von Werkstoffteilchen durch Wärmevorgänge definiert, wobei Wärme durch Energieumsetzung beim The state of the art is to process SiSiC ceramics by means of laser cutting. Thermal ablation with laser beams is defined as separation of material particles by heat processes, whereby heat is converted by energy conversion during the heat treatment
Auftreten eines Laserstrahls am Werkstück entsteht. Mit Lasern ist eine Bearbeitung unabhängig von der Werkstoffhärte möglich, wobei kein Verschleiß am Werkstoff entsteht. Der Schwerpunkt von Laseranwendungen bei der Bearbeitung von Occurrence of a laser beam on the workpiece arises. With lasers, a treatment is possible regardless of the material hardness, with no wear on the material. The focus of laser applications in the machining of
Keramiken liegt in der trennenden Bearbeitung von plattenformigen oder dünnwandig gekrümmten Werkstücken. Neben dieser trennenden Bearbeitung bietet die Ceramics is in the separating processing of plate-shaped or thin-walled curved workpieces. In addition to this separating processing, the
Laserbehandlung die Möglichkeit eines Materialabtrags von der Oberfläche ohne völliges Durchtrennen des Werkstückes. Laser treatment the possibility of material removal from the surface without complete cutting of the workpiece.
Da Siliciumkarbid keine eigene Schmelzphase bildet, sind die klassischen Since silicon carbide does not form its own melting phase, the classic
Verbindungstechniken, die mit oder ohne Schweißzusatzwerkstoff (WIG-, Elektronenoder Laserschweißen) arbeiten und ein partielles Schmelzen der zu verbindenden Teile implizieren, nicht benutzbar für die Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis, da man ein Substrat oder ein Teil aus Keramik nicht schmelzen lassen kann und insbesondere das SiC sich vor dem Schmelzen zersetzt.
Daher ist ein stoffschlüssiges Fügeverfahren wie bei den oxidischen Keramiken, bei denen die zu verbindenden Teile im Nahtbereich lokal aufgeschmolzen werden, nicht möglich. Bonding techniques that work with or without welding consumables (TIG, electron or laser welding) and imply a partial melting of the parts to be joined, not usable for the removal of critical defects of silicon carbide based materials because a ceramic substrate or part can not be melted can and in particular the SiC decomposes before melting. Therefore, a cohesive joining method as in the oxide ceramics, in which the parts to be joined are locally melted in the seam area, not possible.
Infolgedessen sind gegenwärtig das Diffusionsschweißen in der Feststoff Phase, die Sinterverbindungstechnik und das reaktive Löten die häufigsten Techniken zur feuerfesten Verbindung von Keramiken. As a result, solid-phase diffusion bonding, sintered bonding, and reactive soldering are currently the most common techniques for refractory bonding of ceramics.
Das Diffusionsschweißen in der Feststoff Phase sowie die Sinterverbindungstechnik haben den Nachteil, problematisch zu sein in Bezug auf ihre Durchführung. Diffusion bonding in the solid phase as well as the sintered joining technique have the disadvantage of being problematic in terms of their performance.
Im Laufe der Herstellung von beispielsweise Si-SiC Keramik mittels LSI-Prozess (Liquid Silicon Infiltration) entstehen in Folge von thermischen Spannungen in der Abkühlphase der thermischen Behandlung Risse im Bauteil. Andererseits zeichnet sich beispielsweise der LSI-Prozess durch kurze Prozesszeiten und niedrige In the course of the production of, for example, Si-SiC ceramics by means of the LSI process (liquid silicon infiltration), cracks in the component arise as a result of thermal stresses in the cooling phase of the thermal treatment. On the other hand, for example, the LSI process is characterized by short process times and low
Herstellungskosten aus. Production costs.
Es ist daher bei der Realisierung einer Verbindung zwischen Keramiken besonders wichtig, die Restspannungen zu begrenzen, die sich bei der Abkühlung aufgrund unterschiedlicher Wärmeausdehnungskoeffizienten der zu verbindenden Teile entwickeln, wenn sie von unterschiedlicher Art sind, aber auch zwischen der Keramik und dem Lot, wenn die beiden Keramiken von derselben Art sind. Aus diesem Grund muss der Wärmeausdehnungskoeffizient des Lots sehr genau dem der zu It is therefore particularly important in the realization of a connection between ceramics to limit the residual stresses that develop in the cooling due to different thermal expansion coefficients of the parts to be joined, if they are of different types, but also between the ceramic and the solder, if the both ceramics are of the same type. For this reason, the thermal expansion coefficient of the solder must be very close to that of
verbindenden Keramikteile entsprechen. Corresponding ceramic parts correspond.
Es stellt sich daher die Aufgabe, ein neues Verfahren zum stoffschlüssigen Löten von Rissen in Bauteilen zu finden. Dabei sollte eine mechanisch feste, korrosions- und hochtemperaturbeständige Verbindung aus ähnlichem oder identischem Material vom Lot zu dem umgebenden Gefüge bei lokal begrenztem Energieeintrag It is therefore the task of finding a new method for cohesive soldering of cracks in components. It should have a mechanically strong, corrosion and high temperature resistant compound of similar or identical material from the solder to the surrounding structure with a localized energy input
gewährleistet werden.
Gelöst wird diese Aufgabe durch reaktives Löten mit einem Laser oder zwei kombinierten Laserquellen stoffschlüssig unter Zufuhr von Siliciumkarbidpulver oder einer Mischung aus Silicium, Kohlenstoff und Siliciumkarbidpulver. be guaranteed. This object is achieved by reactive soldering with a laser or two combined laser sources cohesively with supply of silicon carbide powder or a mixture of silicon, carbon and silicon carbide powder.
Damit der Wärmeausdehnungskoeffizient des Lots fast gleich aber etwas höher als der des Materials auf Siliciumkarbidbasis ist, darf der Siliciumgehalt den Wert von 97%, angegeben als Atomprozentgehalt, möglichst nicht überschreiten. Ein In order for the coefficient of thermal expansion of the solder to be almost equal to but slightly higher than that of the silicon carbide-based material, the content of silicon should as far as possible not exceed 97%, expressed as atomic percentage. One
Verfahren, das Lote verwendet, deren Atomprozentgehalte innerhalb des oben genannten Bereichs liegen, ist einfach anzuwenden, denn diese Method using solders whose atomic percentages are within the above range is easy to use because these
Zusammensetzungen besitzen sehr gute Benetzungs- und Hafteigenschaften gegenüber SiC. Die Lotzusammensetzung selbst ist nicht teuer, da keine teuren Elemente enthalten sind. Bevorzugt wird beim reaktiven Löten als Spülgas Stickstoff, Druckluft oder als Schutzgas ein Edelgas wie beispielsweise Argon oder Helium eingesetzt. Compositions have very good wetting and adhesion properties towards SiC. The solder composition itself is not expensive, since no expensive elements are included. In the case of reactive brazing, preference is given to using nitrogen, compressed air or a protective gas as inert gas, for example argon or helium.
Es ist besonders bevorzugt, dass als Laser Nd:YAG-Laser, CO2-Laser oder eine Kombination der beiden Laserquellen eingesetzt werden. Vorzugsweise wird als Laser zur Beinflussung des zu lötenden Bereiches ein kurzgepulster Laser mit einer Pulszeit kleiner 10 ps und einem Fokusdurchmesser von 20 μιτι verwendet oder ein kontinuierlicher Laser oder eine Kombination aus kurzgepulsten und kontinuierlichen Lasern unterschiedlicher Wellenlänge. It is particularly preferred that the laser employed are Nd: YAG lasers, CO2 lasers or a combination of the two laser sources. Preferably, a short-pulse laser with a pulse duration of less than 10 ps and a focus diameter of 20 μm is used as the laser for influencing the area to be soldered, or a continuous laser or a combination of short-pulse and continuous lasers of different wavelengths.
Desweiteren sollte auch die Streckenenergie abhängig vom Spaltmaß variiert werden, um ein möglichst optimales Lötergebnis zu bekommen. Furthermore, the path energy should be varied depending on the gap size to get the best possible soldering result.
Das Laserstrahllöten erfolgt bevorzugt bei einer Temperatur von 1200°C bis 1850°C. The laser beam soldering is preferably carried out at a temperature of 1200 ° C to 1850 ° C.
Es ist bevorzugt, dass eine Vorbehandlung (beispielsweise Metallisierung) des Materials auf Siliciumkarbidbasis nicht erfolgt. Dies soll aber eine mechanische Vorbehandlung der Risse mit mechanischen Werkzeugen nicht ausschließen, zum Beispiel Entfetten oder Entstauben.
Als bevorzugte Lotzusannnnensetzung wird eine mit den im keramischen Grundmaterial enthaltenen Bestandteilen aus Verbindungen beziehungsweise Elementen SiC und/oder Si und/oder C eingesetzt. It is preferable that pretreatment (for example, metallization) of the silicon carbide-based material does not occur. However, this should not preclude mechanical pretreatment of the cracks with mechanical tools, for example degreasing or dedusting. As preferred Lotzusannnnensetzung one with the constituents contained in the ceramic base material of compounds or elements SiC and / or Si and / or C is used.
Die Lotzusammensetzung besteht aus SiC und/oder C und/oder Si in einer Menge von 5 bis 95 Gew.-% SiC und/oder C und/oder Si, bezogen auf das Gewicht der Lotzusammensetzung und liegt in einer Form vor, die aus einem Pulver The solder composition consists of SiC and / or C and / or Si in an amount of 5 to 95 wt .-% SiC and / or C and / or Si, based on the weight of the solder composition and is in a form consisting of a powder
verschiedener Korngrößen, textilen Flächengebilden oder einem Schaum bestehen kann. different grain sizes, textile fabrics or a foam can exist.
Bevorzugt wird ein Pulver einer Lotzusammensetzung gebildet, dieses Pulver mit einem organischen Bindemittel in pastöser Form oder als Suspension aufgearbeitet und die Abschnitte oder Teile oder Fügespalte der zu lötenden Formkörper vollflächig mit der erhaltenen Paste oder Suspension überzogen beziehungsweise in den Fügespalt eingefügt. Preferably, a powder of a solder composition is formed, worked up this powder with an organic binder in pasty form or as a suspension and the sections or parts or joining gaps of the molded body to be soldered coated over the entire surface with the resulting paste or suspension or inserted into the joint gap.
Vorzugsweise wird das Pulver einer Lotzusammensetzung zu Presslingen verarbeitet und die Presslinge werden auf die Abschnitte oder Teile oder Fügespalte der zu lötenden Teile durch Einwirkung von einem Laser oder Lasern lokal aufgeschmolzen. Preferably, the powder of a solder composition is processed into compacts and the compacts are locally melted on the portions or parts or joining gaps of the parts to be soldered by the action of a laser or lasers.
Beim reaktiven Löten wird bevorzugt eine Temperatur von mindestens 1200°C durch das Laserlicht an den Abschnittskanten und im Fügespalt erreicht. In reactive soldering, a temperature of at least 1200 ° C. is preferably achieved by the laser light at the section edges and in the joint gap.
Die Materialien auf Siliciumkarbidbasis, deren kritische Fehler durch Laserstrahllöten behoben werden sollen, werden vorzugsweise ausgewählt aus drucklos gesintertem Siliciumkarbid („PLS-SiC");silicium-infiltriertem Siliciumkarbid („SiSiC" oder„RBSC"); porösem rekristallisiertem Siliciumkarbid („RSiC"); Graphit-Silicium („C-SiC"), das aus Graphit besteht und mit einer Schicht aus SiC überzogen ist; den SiC/SiC- Verbundwerkstoffen, zum Beispiel mit Fasern oder Whiskern; den C/SiC- Verbundwerkstoffen, zum Beispiel mit Fasern oder Whiskern aus Kohlenstoff und mit einer SiC-Matrix; den SiC-Einkristallen; den Verbundwerkstoffen aus SiC mit einer anderen Keramik, zum Beispiel SiC/Si3N und SiC/TiN-Verbundwerkstoffen.
Es ist bevorzugt, dass die Materialien auf Siliciumkarbidbasis einen The silicon carbide-based materials whose critical defects are to be corrected by laser beam soldering are preferably selected from silicon carbide ("PLS-SiC") silicon-infiltrated silicon carbide ("SiSiC" or "RBSC"), porous recrystallized silicon carbide ("RSiC"). ); Graphite silicon ("C-SiC"), which consists of graphite and is coated with a layer of SiC; the SiC / SiC composites, for example with fibers or whiskers, the C / SiC composites, for example with fibers or Carbon and SiC whiskers, the SiC single crystals, the SiC composites with another ceramic, for example SiC / Si3N and SiC / TiN composites. It is preferable that the silicon carbide based materials have a
Siliciumkarbidgehalt größer oder gleich 80 Gew.-% aufweisen. Have silicon carbide content greater than or equal to 80 wt .-%.
Das erfindungsgemäße Verfahren wird bevorzugt verwendet zur Herstellung von keramischen Formkörpern für den Automobilbau, den Bau von Luft- und The inventive method is preferably used for the production of ceramic moldings for the automotive industry, the construction of air and
Raumfahrzeugen sowie für den Ofenbau. Spacecraft as well as for furnace construction.
Beispiel example
SiSiC Bauteil mit einem Riss SiSiC component with a crack
Der Riss wird entlang dem Rissverlauf mit einem Handfräser bis in eine Tiefe, abhängig von Risstiefe und Größe, von 1 -2 mm aufgefräßt. In diese Fräsnut wird das Lot vorsichtig eingefüllt um Blasenbildung zu vermeiden. Das Bauteil wird in eine evakuierbare Kammer gegeben und das Lot durch kurzes anlegen von Vakuum und Druck in den Spalt eingedrückt. Anschließend wird der Rissverlauf bis zu 1 mm Überstand mit dem Lot aufgefüllt. Nach dem Trocknen wird mittels eines CO2-Lasers der Wellenlänge 10,6 μιτι unter einer Schutzgasatmosphäre und einer maximalen Leistung von 700 W dem Rissverlauf nachgefahren. Durch das Laserlicht wird eine Temperatur >1420°C in den Plattenkanten und im Spalt erreicht und es kommt zum Aufschmelzen des Siliciums, die gleichzeitig einsetzende Reaktion des Siliciums mit Kohlenstoff führt in einer exothermen Reaktion zur Bildung von SiC. Durch die zusätzliche Wärme, die durch die Reaktion gebildet wird, erfolgt ein Aufheizen auch in die Tiefe des Spaltes und die Plattenkanten. Der Riss ist anschließend The crack is milled along the crack course with a hand mill to a depth, depending on crack depth and size, from 1 -2 mm. In this milling groove, the solder is carefully filled to avoid blistering. The component is placed in an evacuated chamber and the solder pressed by briefly applying vacuum and pressure in the gap. Then the crack course is filled up to 1 mm supernatant with the solder. After drying, 2 laser of wavelength 10.6 μιτι is under a protective gas atmosphere, and a maximum power of 700 W the crack path traced by means of a CO. The laser light reaches a temperature> 1420 ° C in the plate edges and in the gap and it comes to the melting of the silicon, the simultaneous onset of reaction of silicon with carbon in an exothermic reaction to form SiC. Due to the additional heat that is formed by the reaction, a heating also takes place in the depth of the gap and the plate edges. The crack is then
verschlossen und die Bauteilfestigkeit ist wieder hergestellt.
closed and the component strength is restored.
Claims
1 . Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciunnkarbidbasis, dadurch gekennzeichnet, dass mit einem Laser oder zwei kombinierten Laserquellen stoffschlüssig unter Zufuhr von Siliciumkarbidpulver oder einer Mischung aus Silicium, Kohlenstoff und Siliciumkarbidpulver reaktiv gelötet wird. 1 . Method for eliminating critical defects of silicon carbide-based materials, characterized in that it is reactively soldered with one laser or two combined laser sources in a materially bonded manner with supply of silicon carbide powder or a mixture of silicon, carbon and silicon carbide powder.
2. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach Anspruch 1 , dadurch gekennzeichnet, dass beim reaktiven Löten als Spülgas Stickstoff, Druckluft oder als Schutzgas ein Edelgas eingesetzt wird. 2. A method for the removal of critical defects of silicon carbide based materials according to claim 1, characterized in that in the reactive soldering as purge nitrogen, compressed air or inert gas as a noble gas is used.
3. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Laser Nd:YAG-Laser, CO2-Laser oder eine Kombination der beiden Laserquellen eingesetzt werden. 3. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that are used as the laser Nd: YAG laser, CO 2 laser or a combination of the two laser sources.
4. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Laser zur Beinflussung des zu lötenden Bereiches ein kurzgepulster Laser mit einer Pulszeit kleiner 10 ps und einem 4. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that as a laser for influencing the area to be soldered a short-pulse laser with a pulse time less than 10 ps and a
Fokusdurchmesser von 20 μιτι verwendet wird oder ein kontinuierlicher Laser, oder eine Kombination von kurzgepulsten und kontinuierlichen Lasern unterschiedlicher Wellenlänge eingesetzt wird. Focusing diameter of 20 μιτι is used or a continuous laser, or a combination of short-pulse and continuous lasers of different wavelengths is used.
5. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Laserstrahllöten bei einer Temperatur von 1200°C bis 1850°C erfolgt. 5. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that the laser beam soldering takes place at a temperature of 1200 ° C to 1850 ° C.
6. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass keine Vorbehandlung des Materials auf Siliciunnkarbidbasis erfolgt, abgesehen von einer mechanischen Vorbehandlung der Risse. 6. A method for the removal of critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that no pretreatment of the material Silicicarbarbidbasis takes place, apart from a mechanical pretreatment of the cracks.
7. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine Lotzusammensetzung mit im keramischen Grundmaterial enthaltenen Bestandteile aus Verbindungen beziehungsweise Elementen SiC und/oder Si und/oder C eingesetzt wird. 7. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that a solder composition is used with components contained in the ceramic base material of compounds or elements SiC and / or Si and / or C.
8. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Lotzusammensetzung aus SiC und/oder C und/oder Si in einer Menge von 5 bis 95 Gew.-% SiC und/oder C und/oder Si, bezogen auf das Gewicht der Lotzusammensetzung besteht und in einer Form vorliegt, die aus einem Pulver verschiedener Korngrößen, textilen Flächengebilden oder einem Schaum bestehen kann. 8. A method for eliminating critical defects of silicon carbide-based materials according to one or more of the preceding claims, characterized in that the solder composition of SiC and / or C and / or Si in an amount of 5 to 95 wt .-% SiC and / or C and / or Si, based on the weight of the solder composition and in a form which may consist of a powder of different particle sizes, textile fabrics or a foam.
9. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ein Pulver einer Lotzusammensetzung gebildet wird, dieses Pulver mit einem organischen Bindemittel in pastöser Form oder als 9. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that a powder of a solder composition is formed, this powder with an organic binder in pasty form or as
Suspension aufgearbeitet und die Abschnitte oder Teile oder Fügespalte der zu lötenden Formkörper vollflächig mit der erhaltenen Paste oder Suspension überzogen beziehungsweise in den Fügespalt eingefügt werden. Worked up the suspension and the sections or parts or joining gaps of the molded body to be soldered coated over the entire surface with the resulting paste or suspension or inserted into the joint gap.
10. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis, dadurch gekennzeichnet, dass das Pulver einer 10. A method for eliminating critical defects of silicon carbide-based materials, characterized in that the powder of a
Lotzusammensetzung zu Presslingen verarbeitet wird und die Presslinge auf die Abschnitte oder Teile oder Fügespalte der zu lötenden Teile durch Einwirkung von einem Laser oder Lasern lokal aufgeschmolzen werden. Solder composition is processed into compacts and the compacts are locally melted on the sections or parts or joining gaps of the parts to be soldered by the action of a laser or lasers.
1 1 . Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass beim reaktiven Löten eine Temperatur von mindestens 1200°C durch das Laserlicht an den Abschhnittskanten und im Fügespalt erreicht wird. 1 1. Method for eliminating critical defects of silicon carbide-based materials according to one or more of the preceding claims, characterized in that during reactive soldering a temperature of at least 1200 ° C is achieved by the laser light at Abschhnittskanten and in the joint gap.
12. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Materialien auf Siliciumkarbidbasis, deren kritische Fehler durch Laserstrahllöten behoben werden sollen, ausgewählt werden aus drucklos gesintertem Siliciumkarbid („PLS-SiC");silicium-infiltriertem 12. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that the silicon carbide based materials whose critical defects are to be corrected by laser beam soldering are selected from unpressurised silicon carbide ("PLS-SiC"). ); silicon-infiltrated
Siliciumkarbid („SiSiC" oder„RBSC"); porösem rekristallisiertem Siliciumkarbid („RSiC"); Graphit-Silicium („C-SiC"), das aus Graphit besteht und mit einer Schicht aus SiC überzogen ist; den SiC/SiC-Verbundwerkstoffen, zum Beispiel mit Fasern oder Whiskern; den C/SiC-Verbundwerkstoffen, zum Beispiel mit Fasern oder Whiskern aus Kohlenstoff und mit einer SiC-Matrix; den SiC-Einkristallen; den Verbundwerkstoffen aus SiC mit einer anderen Keramik, zum Beispiel SiC/Si3N und SiC/TiN-Verbundwerkstoffen. Silicon carbide ("SiSiC" or "RBSC"); porous recrystallized silicon carbide ("RSiC"), graphite silicon ("C-SiC"), which consists of graphite and is coated with a layer of SiC; the SiC / SiC composites, for example with fibers or whiskers; the C / SiC composites, for example with fibers or whiskers of carbon and with a SiC matrix; the SiC single crystals; SiC composites with another ceramic, such as SiC / Si3N and SiC / TiN composites.
13. Verfahren zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach einem oder mehrerer der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Materialien auf Siliciumkarbidbasis einen 13. A method for eliminating critical defects of silicon carbide based materials according to one or more of the preceding claims, characterized in that the silicon carbide based materials
Siliciumkarbidgehalt größer oder gleich 80 Gew.-% aufweisen. Have silicon carbide content greater than or equal to 80 wt .-%.
14. Verwendung des Verfahrens zur Behebung von kritischen Fehlern von Materialien auf Siliciumkarbidbasis nach Anspruch 1 zur Herstellung von 14. Use of the method for the removal of critical defects of silicon carbide based materials according to claim 1 for the production of
keramischen Formkörpern für den Automobilbau, den Bau von Luft- und Ceramic moldings for the automotive industry, the construction of air and
Raumfahrzeugen sowie für den Ofenbau. Spacecraft as well as for furnace construction.
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DE102011083864A DE102011083864A1 (en) | 2011-09-30 | 2011-09-30 | Laser beam brazing of silicon carbide based materials |
DE102011083864.3 | 2011-09-30 |
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Cited By (4)
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WO2016018507A3 (en) * | 2014-07-28 | 2016-03-03 | The Curators Of The University Of Missouri | Ceramic-ceramic welds |
CN106825999A (en) * | 2017-03-14 | 2017-06-13 | 武汉理工大学 | A kind of preparation method of foam metal Combined Welding tablet |
CN106884159A (en) * | 2017-01-16 | 2017-06-23 | 哈尔滨工业大学 | The preparation method and its assistant brazing C/C composites of carbon-coating cladding foam carbon/carbon-copper composite material and the method for metal |
CN115368141A (en) * | 2022-09-15 | 2022-11-22 | 湖南博云新材料股份有限公司 | alpha-SiC and amorphous silicon nitride complex phase ceramic brake material and preparation method thereof |
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JPH07187836A (en) * | 1993-12-24 | 1995-07-25 | Toshiba Ceramics Co Ltd | Method for joining si-containing ceramics with laser light |
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- 2011-09-30 DE DE102011083864A patent/DE102011083864A1/en not_active Withdrawn
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JPH01148761A (en) * | 1987-12-04 | 1989-06-12 | Isamu Miyamoto | Method for bonding ceramics |
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WO2016018507A3 (en) * | 2014-07-28 | 2016-03-03 | The Curators Of The University Of Missouri | Ceramic-ceramic welds |
CN106884159A (en) * | 2017-01-16 | 2017-06-23 | 哈尔滨工业大学 | The preparation method and its assistant brazing C/C composites of carbon-coating cladding foam carbon/carbon-copper composite material and the method for metal |
CN106825999A (en) * | 2017-03-14 | 2017-06-13 | 武汉理工大学 | A kind of preparation method of foam metal Combined Welding tablet |
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CN115368141B (en) * | 2022-09-15 | 2023-07-14 | 湖南博云新材料股份有限公司 | alpha-SiC and amorphous silicon nitride composite ceramic brake material and preparation method thereof |
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