CN103276394A - Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure - Google Patents
Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure Download PDFInfo
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Abstract
The invention discloses a laser remelting one-step reinforcing processing method and device thereof for a plasma sprayed thermal barrier coating with a double-layer structure. A plasma spraying process is adopted to spray the thermal barrier coating with the double-layer structure on a matrix surface after purification and activating treatment; and an induction heating auxiliary laser remelting compound process is adopted to remelt the thermal barrier coating with the double-layer structure. With the adoption of the induction heating auxiliary laser remelting compound process, the defect of insufficient energy of pure laser remelting can be overcome, so that one-step laser remelting can melt a ceramic layer and a bonding layer in the thermal barrier coating with the double-layer structure simultaneously, and one-step reinforcement of metallurgical bonding between the ceramic layer and the bonding layer interface and between the bonding layer and the matrix interface is achieved simultaneously; and the laser remelting one-step reinforcing processing device has the advantages of simple process, good stability, good remelted coating quality and the like, and accordingly is expected to be applied to key hot-end part surfaces of air-turbine motor blades and the like.
Description
Technical field
The present invention relates to a kind of method and apparatus that thermal barrier coating is carried out the laser remolten reinforcement, one step of a kind of plasma spraying bilayer structure thermal barrier coating by laser remelting in particular reinforcing process method and device thereof.
Background technology
In order to reduce the fuel consumption of following space flight and aviation engine, improve thrust/mass ratio and work-ing life, many density are low, room temperature good toughness, advanced material that hot strength is high will be used in a large number, various functional coatings will be used widely simultaneously, and wherein thermal barrier coating plays important effect to improving engine operating temperature.
Thermal barrier coating mainly contains three kinds of structures: bilayer structure, multilayered structure and gradient-structure.Wherein double-deck surface layer is the surface ceramic layer, and the middle layer is metal bonding coating.Multilayered structure is to have added which floor layer of blockading on double-deck basis, generally has five layers, but that this structure is improved thermal shock resistance is little, and complex process, thereby is replaced by gradient cladding gradually.The gradient-structure coating is to adopt composition, a kind of structure of structure continually varying between ceramic layer and matrix metal, it can reduce the internal stress that ceramic layer and tack coat cause because linear expansivity is different, thereby improves Bond Strength of Coating and thermal shock resistance.Because preparation technology is simple, the bilayer structure thermal barrier coating becomes the structure formation that thermal barrier coating mainly adopts.
At present, the technology of preparation thermal barrier coating mainly contains plasma spraying and electro beam physics vapour deposition etc.It is low that plasma spraying has a cost, the production efficiency height, and advantage such as thickness is adjustable, and composition is easy to control, but coating is typical laminate structure, and pore is many, and heat shock resistance is poor; Coating and matrix are mechanical bond, anti-strain differential; And the columnar crystal structure perpendicular to matrix surface of electro beam physics vapour deposition technology preparation, the space is few, coating and matrix are metallurgical binding, heat shock resistance and peel-ability are strong, but the sedimentation rate of electro beam physics vapour deposition technology is lower, the equipment manufacturing cost costliness is subjected to the Composition Control that influences coating of element vapour pressure difficult, and the matrix part need heat and specimen size can not be too big.Therefore these two kinds of technologies of preparing have tangible deficiency, thereby have limited its range of application.
Laser remolten is the effective ways that improve plasma spraying thermal barrier coating performance.In the process of laser remolten, high-energy-density thermal source quick travel, the material rapid solidification produces even, fine and close microstructure, and the surface smoothness height, thereby improves coating quality, prolongs coating life.But because poor thermal shock resistance, the fracture toughness property value of thermal barrier coating surface ceramic material are low, therefore easily crack under the rapid heating in the laser remolten process, the cooling conditions, the fusing point of adding the surface ceramic material is much higher than tack coat and metallic matrix, and physical parameters such as the thermal expansivity between them, Young's modulus and thermal conductivity differ greatly, the thermograde in zone, formed molten bath is very big after laser irradiation, consequent thermal stresses causes coating to crack or peel off easily, has limited the further performance of coating performance to a certain extent.
At present, laser remolten plasma spraying bilayer structure thermal barrier coating has dual mode usually: a kind of bilayer structure thermal barrier coating that is the article on plasma spraying is preset carries out the one piece laser remolten and strengthens, another kind method is plasma spraying metal bonding coating at first, then it being carried out laser remolten strengthens, through sprayed surface ceramic layer again after the surface treatment, at last ceramic layer is carried out the substep reinforcing process of remelting hardening.
One time remelting process technology is simple, relevant report is also more, mainly laying particular emphasis on laser remolten at first handles researchs such as coating structure, Effect on Performance and process parameter optimizings, as Tsai(Tsai P C, Lee J H, Hsu C S.Hot corrosion behavior of laser-glazed plasma-sprayed yttria-stabilized zirconia thermal barrier coatings in the presence of V
2O
5[J] .Surface﹠amp; Coatings Technology, 2007,201:5134-5147.) and Lee(Lee J H, Tsai P C, Chang C L.Microstructure and thermal cyclic performance of laser-glazed plasma-sprayed ceria – yttria-stabilized zirconia thermal barrier coatings[J] .Surface﹠amp; Coatings Technology, 2008,202:5607-5612.) (Tsai P C, Lee J H, Hsu C S. laser remolten plasma spraying Y
2O
3Stablize ZrO
2Thermal barrier coating V
2O
5Molten salt hot corrosion behavior [J]. top coat technology, 2007,201:5134-5147. and Lee J H, Tsai P C, Chang C L. laser remolten plasma spraying CeO
2-Y
2O
3Stablize ZrO
2Thermal barrier coating tissue and thermal circulation performance [J]. the top coat technology, 2008,202:5607-5612.) etc. studied the influence of laser remolten article on plasma spraying thermal barrier coating tissue, hot corrosion resistance and thermal shock performance, and the contriver has studied laser remolten article on plasma spraying MCrAlY/ZrO
2-7%Y
2O
3Influence (the Wang Dongsheng of bilayer structure thermal barrier coating tissue, high temperature oxidation resistance and erosion property, Tian Zongjun, Shen Lida, Deng .TiAl alloy surface laser remolten thermal barrier coating tissue and high temperature oxidation resistance [J]. functional materials, 2009,40 (4): 578-581. Wang Dong gives birth to, Tian Zongjun, king river rising in Ningxia and flowing into central Shaanxi literary composition, Deng. laser remolten article on plasma spraying thermal barrier coating erosion behavioral implications [J]. welding journal, 2011,32 (2): 5-8.), the result shows: the plasma spraying heat barrier ceramic coating is typical stratiform stacking characteristic, certain hole is arranged and be distributed with tiny crack; After handling through laser remolten, ceramic coating sheet tissue is disappeared, and the compactness raising has obtained not have substantially the remelted layer of defective such as crackle; Whole remelted layer comprises that the interface does not have brilliant and top, the plane of obvious characteristic along columanar structure that direction of heat flow is grown; The plasma spraying thermal barrier coating has resistance to high temperature oxidation and erosion property preferably, can further improve its resistance to high temperature oxidation and erosion ability through behind the laser remolten; The erosive wear of plasma sprayed coating comes off based on sheet, and brittle ceramic grain breakage is to a certain degree arranged simultaneously, and the laser remolten sample is with crack initiation and the expansion on nearly surface, and it is main finally causing the fragmentation of remelted layer crystal grain, peeling off.But owing to be subjected to the combined influence of factors such as laser power, energy density, the distribution of temperature field, lasing district, ceramic thermal conductivity and coat-thickness, a remelting of laser often can only make ceramic surface obtain remelting hardening, and ceramic topcoats and metal bonding coating, tack coat and basal body interface and tack coat itself can not obtain effective reinforcement, thereby becomes the weak link of destroying in the whole thermal barrier coating working process.
With respect to remelting processing of laser, the substep enhancement method is remelting tack coat and ceramic layer successively, thereby make technology too complicated, and the stability of the repeatability of its preparation and coating quality is not high, the stress synergistic effect of adding secondary remelting makes coating more easy to crack and peel off, though thereby its strengthening effect is better than a laser remolten, this technology is not widely used.As (Gaoyang such as Gaoyang, Xie Lun, Tong Baiyun, etc. laser cladding Zirconium oxide heat barrier coating Study on Microstructure [J]. aeronautical material journal, 2003,23 (3): 1-4. Gaoyang, Pan Feng, beam is brave, etc. high-temperature alloy surface laser cladding thermal barrier coating weave construction and oxidation susceptibility [J]. the aeronautical material journal, 2003,21 (1): 4-7.) studied the influence of laser secondary remelting to thermal barrier coating weave construction and oxidation susceptibility.In test its to the matrix sandblasting after plasma spraying NiCoCrAlY alloy layer at first, adopt the continuous CO of 5KW then
2Laser apparatus carries out remelting; After the sandblasting of remelted alloy laminar surface, again with ZrO
2The ceramics powder plasma spray is applied to the surface, and the melanism of spraying paint is then carried out laser remolten again.The result shows: laser melts and solidifies the directed epitaxy of acquisition, closelypacked column crystal zirconia ceramic layer fast.There is alumina layer between NiCoCrAlY key coat and the column crystal, guaranteed the connection of column crystal and NiCoCrAlY layer, be metallurgical binding between zirconia layer and NiCoCrAlY key coat, key coat and matrix in addition.The high temperature oxidation resistance test draws laser remolten sample oxidation kinetics and observes the para-curve rate process approx.At 1200 ℃, laser remolten thermal barrier coating oxidation-resistance is apparently higher than the plasma spraying thermal barrier coating under the air.
Peeling off of numerous generations that studies show that crackle and coating is the laser remolten plasma spraying thermal barrier coating most thorny issue.In order to obtain the laser remolten thermal barrier coating of good quality, zero defect or few defective, should do deep research to rapid solidification theory and the compound coating interface fine structure on laser remolten technical know-how basis theoretically on the one hand, disclose the essence of laser remolten process; On the other hand, should on technology, control and improve formation and the quality of coating, with thermal stresses and the structural stress after the minimizing remelting.The method of currently used inhibition laser remolten (cladding) cracking mainly contains: adjust stressed condition, reduce tensile stress as far as possible; Optimize processing method and parameter; Appropriate design cladding layer and change lasing pattern etc.Adjusting the measure commonly used of cladding layer stressed condition is that sample is carried out preheating and/or slow cooling processing, as preheating and/or the slow cooling by insulation can, the contriver has proposed a kind of by changing the method (Wang Dongsheng that laser energy density distributes to control the cladding layer crackle, Tian Zongjun, king river rising in Ningxia and flowing into central Shaanxi literary composition, Deng. a kind of by changing the method [J] of laser energy density distribution control cladding layer crackle. Chinese laser, 2011,38 (1): 0103004.).The result shows: be the typical rapid heating of laser processing, quick air-circulation features with uniform hot spot cladding, and adopt the convex shape hot spot can play the effect of preheating, slow cooling to a certain extent, thereby reduce the thermograde of cladding area and non-cladding area, in addition, under the suitable prerequisite of cladding effect, its cladding layer thermal stresses is also less, thereby can effectively reduce the cracking trend of cladding layer.Adopt the method for induction heating auxiliary laser cladding, carry out laser melting coating when namely responding to pre-hot substrate, this method not only can make cladding efficient improve greatly but also can obtain flawless cladding layer.
(Grilloud R such as the Grilloud of the U.S., Gonseth D, Dekumbis R, et al.Apparatus for producing a surface layer on a metallic workpiece[P] .US Patent5224997,1993:l-16.) (Grilloud R, Gonseth D, Dekumbis R, Deng. a kind of device [P] of working metal surface preparation coating. United States Patent (USP) 5224997,1993:l-16.) people takes the lead in having proposed induction heating auxiliary laser melting and coating technique, the advantage of this technology is integrated laser melting coating and induction heating, can remedy simple laser melting coating energy shortage and the thermal source disadvantageous shortcoming that distributes, it is good to have technology stability, be easy to form metallurgical binding, obtain advantages such as flawless cladding coating easily, therefore have good development prospect.The Bernal technical study to the crackle behavior of induction boosting laser melting coating carried out studying (Zhang Y.Eliminating cladding cracks:pre-heating and stress analysis[C] .ICALEO 2001, Section D:1-10.) (Zhang Y. is coated with except the cladding crackle: preheating and stress distribution [C] .2001 laser and electron optics are used international conference, D:1-10.).Studies show that induction heating auxiliary laser cladding layer tensile stress reduces greatly, can obtain the cladding layer that high rigidity is exempted from crackle for cladding material MM10 (carbon content 2.45%), pre-heating technique has no significant effect microstructure and the wear resistance of cladding layer.Fourth waits eastwards that (fourth eastwards, connect and build, close center of percussion etc. and the compound novel process of the remelting of right cylinder Medium frequency induction and laser reinforcing [[J]. the welding journal, 2000,21 (4): 5-8.) to the thermally sprayed coating of homemade Ni60A self-fluxing alloy powder, carried out the experimental study of Medium frequency induction remelting and laser reinforcing Compound Machining.Experimental study shows that Compound Machining has the advantage of Medium frequency induction remelting, can obtain the coating of large-area any surface finish, and the coating homogeneous microstructure, and flawless exists excellent metallurgical to be combined with matrix; Simultaneously, Compound Machining has the advantage of laser remolten again, has not only reduced the porosity in the coating, and has improved cladding layer and high base strength, makes it to have antiwear property preferably.More research work has been done in related fields by the Central China University of Science and Technology, Zhou Shengfeng (Zhou S F, Huang Y J, Zeng X Y, et al.Microstructure characteristics of Ni-based WC composite coatings by laser induction hybrid rapid cladding[J] .Materials Science and Engineering A, 2008,480:564-572.) (Zhou S F, Huang Y J, Zeng X Y, Deng. the basic WC compound coating tissue signature [J] of laser induced compound quick cladding Ni. Materials Science and Engineering A, 2008,480:564-572.) induction heating auxiliary laser cladding Ni base WC composite bed is studied, and Huang Yongjun (Huang Y J, Y S F.Modeling the geometric formation and powder deposition mass in laser induction hybrid cladding[J] .Journal of Mechanical Science and Technology, 2012,26 (8): 2347-2351.) (Huang Y J, Yuan S F. laser induction composite covers macro-size and powder deposition rate model [J]. machine science and technical journal, 2012,26 (8): 2347-2351.) then primary study the mechanism of induction heating auxiliary laser cladding.
In sum, find by prior art documents, common article on plasma spraying bilayer structure thermal barrier coating enhancement method once laser remolten is strengthened and the substep remelting hardening, but a traditional laser remolten can only the strengthening surface ceramic layer, and substep is strengthened not only complex process, and coating easily cracks, and tangible deficiency is arranged.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, one step of a kind of plasma spraying bilayer structure thermal barrier coating by laser remelting reinforcing process method and device thereof are provided, reach the double effects that increases energy input and improve the remelted layer quality.The present invention is achieved by the following technical solutions, the present invention includes following steps:
(1) adopting plasma spray coating process to spray the bilayer structure thermal barrier coating successively through the matrix surface after purification and the activation treatment;
(2) adopt induction heating auxiliary laser remelting recombining process that the bilayer structure thermal barrier coating is carried out remelting.
In the described step (1), the surface layer of bilayer structure thermal barrier coating is the surface ceramic layer, and the middle layer is metal bonding coating.
As one of optimal way of the present invention, described plasma spray coating process is selected from a kind of in air plasma spraying, protective atmosphere plasma spraying, vacuum plasma spray coating, the steady plasma spraying of water.
As one of optimal way of the present invention, described matrix is nickel base superalloy, and described surface ceramic layer is ZrO
2Base ceramic material, metal bonding coating are the McrAlY alloy.
One step of a kind of plasma spraying bilayer structure thermal barrier coating by laser remelting is strengthened the device of processing, comprise load coil, laser head, high frequency induction heater, described high frequency induction heater links to each other with load coil, load coil is fixed on the laser head, and the laser of laser head emission is positioned at the heating region central authorities of load coil.
The present invention has the following advantages compared to existing technology: the present invention is at first through plasma spraying metal bonding coating and surface ceramic layer successively on the pretreated matrix surface, adopt induction heating auxiliary laser remelting recombining process that thermal barrier coating is handled then, can melt ceramic layer and tack coat in the bilayer structure thermal barrier coating simultaneously, make ceramic layer and tie-layer interface, tack coat and basal body interface reach metallurgical binding simultaneously; Adopt induction heating auxiliary laser remelting recombining process, can remedy the shortcoming of simple laser remolten energy shortage, thereby make a laser remolten can melt ceramic layer and tack coat in the bilayer structure thermal barrier coating simultaneously, make ceramic layer and tie-layer interface, tack coat and basal body interface reach a step enhancement purpose of metallurgical binding simultaneously; Laser beam is acted on middle part, induction heating zone, can remedy the disadvantageous deficiency of LASER HEAT source distribution, thereby reduce remelting zone and thermograde on every side, bigger in addition induction heating zone is equivalent to the gentle cold-working usefulness of preheating has been played in the molten bath, thereby can effectively reduce remelting thermal barrier coating cracking trend; Have that technology is simple, good stability, remelting coating quality advantages of higher, therefore be expected to be applied to crucial hot junction component surfaces such as aero-turbine blade.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, processing unit (plant) of the present invention, comprise load coil 2, laser head 3, high frequency induction heater 4, described high frequency induction heater 4 links to each other with load coil 2, load coil 2 is fixed on the laser head 3, and the laser of laser head 3 emissions is positioned at the heating region central authorities of load coil 2, and sample 5 is fixed on the worktable 7, this device also uses numerical control supervisory control desk 1 to control laser apparatus 6 and high frequency induction heater 4 respectively, and laser apparatus 6 links to each other with laser head 3.
Adopt one step of induction heating auxiliary laser remelting recombining process to strengthen plasma spraying MCrAlY/ZrO at the nickel base superalloy matrix surface
2The bilayer structure thermal barrier coating, concrete steps are as follows:
(1) Wire EDM to the GH4033 nickel base superalloy matrix surface of 40mm * 40mm * 8mm is polished, pre-treatment such as oil removing, sandblast and cleaning;
(2) spray MCrAlY metal bonding coating and ZrO at the nickel base superalloy matrix surface successively with the 3710 type air plasma spraying systems that U.S. Praxair company produces
2The surface ceramic layer, the nominal composition of MCrAlY metal bonding coating is: Ni-20Co-18Cr-15Al-2Y
2O
3, massfraction, %.Spraying parameter sees Table 1;
(3) SLCF-X12 * 25 type CO are adopted in the remelting of induction heating auxiliary laser
2Laser machine, Hac high frequency induction heater 4, laser spot size are realized by focusing, and laser power, sweep velocity and high frequency induction heater 4 power are regulated by numerical control supervisory control desk 1, and processing parameter sees Table 2.Make ZrO in the bilayer structure thermal barrier coating by the laser remolten processing
2Surface ceramic layer and MCrAlY metal bonding coating melt simultaneously, make ZrO
2Surface ceramic layer and MCrAlY metal bonding bed interface, MCrAlY metal bonding coating and GH4033 nickel base superalloy basal body interface reach metallurgical binding simultaneously, reach a step strengthening effect, the thermal barrier coating of remelting simultaneously surface has only a small amount of map cracking, has effectively reduced the cracking trend of thermal barrier coating in the laser remolten process.
Embodiment 2
Present embodiment adopts one step of induction heating auxiliary laser remelting recombining process to strengthen plasma spraying MCrAlY/ZrO at the nickel base superalloy matrix surface
2-MgO bilayer structure thermal barrier coating, concrete steps are as follows:
(1) GH4033 nickel base superalloy matrix surface is polished, pre-treatment such as oil removing, sandblast and cleaning;
(2) spray MCrAlY metal bonding coating and ZrO successively at the nickel base superalloy matrix surface
2-22%MgO(massfraction) surface ceramic layer, spraying parameter sees Table 1;
(3) make ZrO in the bilayer structure thermal barrier coating by the laser remolten processing
2-22%MgO surface ceramic layer and MCrAlY metal bonding coating melt simultaneously, make ZrO
2-22%MgO surface ceramic layer and MCrAlY metal bonding bed interface, MCrAlY metal bonding coating and GH4033 nickel base superalloy basal body interface reach metallurgical binding simultaneously, reach a step strengthening effect, remelting thermal barrier coating surface has only a small amount of map cracking in addition, has effectively reduced the cracking trend of thermal barrier coating in the laser remolten process.Processing parameter sees Table 2.
Other embodiments are identical with embodiment 1.
Embodiment 3
Present embodiment adopts one step of induction heating auxiliary laser remelting recombining process to strengthen plasma spraying MCrAlY/ZrO at the nickel base superalloy matrix surface
2-CaO bilayer structure thermal barrier coating, concrete steps are as follows:
(1) GH4033 nickel base superalloy matrix surface is polished, pre-treatment such as oil removing, sandblast and cleaning;
(2) spray MCrAlY metal bonding coating and ZrO successively at the nickel base superalloy matrix surface
2-15%CaO(massfraction) surface ceramic layer, spraying parameter sees Table 1;
(3) make ZrO in the bilayer structure thermal barrier coating by the laser remolten processing
2-22%MgO surface ceramic layer and MCrAlY metal bonding coating melt simultaneously, make ZrO
2-15%CaO surface ceramic layer and MCrAlY metal bonding bed interface, MCrAlY metal bonding coating and GH4033 nickel base superalloy basal body interface reach metallurgical binding simultaneously, reach a step strengthening effect, remelting thermal barrier coating surface has only a small amount of map cracking in addition, has effectively reduced the cracking trend of thermal barrier coating in the laser remolten process.Processing parameter sees Table 2.
Other embodiments are identical with embodiment 1.
Embodiment 4
Present embodiment adopts one step of induction heating auxiliary laser remelting recombining process to strengthen plasma spraying MCrAlY/ZrO at the nickel base superalloy matrix surface
2-Y
2O
3The bilayer structure thermal barrier coating, concrete steps are as follows:
(1) GH4033 nickel base superalloy matrix surface is polished, pre-treatment such as oil removing, sandblast and cleaning;
(2) spray MCrAlY metal bonding coating and Y successively at the nickel base superalloy matrix surface
2O
3-7%ZrO
2(massfraction) surface ceramic layer, spraying parameter sees Table 1;
(3) make Y in the bilayer structure thermal barrier coating by the laser remolten processing
2O
3-7%ZrO
2Surface ceramic layer and MCrAlY metal bonding coating melt simultaneously, make Y
2O
3-7%ZrO
2Surface ceramic layer and MCrAlY metal bonding bed interface, MCrAlY metal bonding coating and GH4033 nickel base superalloy basal body interface reach metallurgical binding simultaneously, reach a step strengthening effect, remelting thermal barrier coating surface has only a small amount of map cracking in addition, has effectively reduced the cracking trend of thermal barrier coating in the laser remolten process.Processing parameter sees Table 2.
Other embodiments are identical with embodiment 1.
Embodiment 5
Present embodiment adopts one step of induction heating auxiliary laser remelting recombining process to strengthen plasma spraying MCrAlY/ZrO at the nickel base superalloy matrix surface
2-CeO
2The bilayer structure thermal barrier coating, concrete steps are as follows:
(1) GH4033 nickel base superalloy matrix surface is polished, pre-treatment such as oil removing, sandblast and cleaning;
(2) spray MCrAlY metal bonding coating and ZrO successively at the nickel base superalloy matrix surface
2-10%CeO
2(massfraction) surface ceramic layer, spraying parameter sees Table 1;
(3) make ZrO in the bilayer structure thermal barrier coating by the laser remolten processing
2-10%CeO
2Surface ceramic layer and MCrAlY metal bonding coating melt simultaneously, make ZrO
2-10%CeO
2Surface ceramic layer and MCrAlY metal bonding bed interface, MCrAlY metal bonding coating and GH4033 nickel base superalloy basal body interface reach metallurgical binding simultaneously, reach a step strengthening effect, remelting thermal barrier coating surface has only a small amount of map cracking in addition, has effectively reduced the cracking trend of thermal barrier coating in the laser remolten process.Processing parameter sees Table 2.
Other embodiments are identical with embodiment 1.
Table 1 plasma spraying parameter
| Processing parameter | MCrAlY | ZrO 2 | ZrO 2-MgO | ZrO 2-CaO | ZrO 2-Y 2O 3 | ZrO 2-CeO 2 |
| Electric current/A | 710 | 920 | 920 | 920 | 920 | 920 |
| Voltage/V | 42 | 42 | 42 | 42 | 42 | 42 |
| Main gas, Ar/PSI | 65 | 45 | 45 | 45 | 45 | 45 |
| Auxilliary gas, He/PSI | 115 | 150 | 150 | 150 | 150 | 150 |
| Carrier gas, Ar/PSI | 45 | 45 | 45 | 45 | 45 | 45 |
| Powder feeding rate/(rmin -1) | 2 | 3 | 3 | 3 | 3 | 3 |
| Spray distance/mm | 110 | 100 | 100 | 100 | 100 | 100 |
| Spray gun translational speed/(mms -1) | 100 | 100 | 100 | 100 | 100 | 100 |
| Coat-thickness/μ m | 100 | 350 | 350 | 350 | 350 | 350 |
Table 2 induction heating auxiliary laser remelting recombining process parameter
Claims (5)
1. one step of plasma spraying bilayer structure thermal barrier coating by laser remelting reinforcing process method is characterized in that, may further comprise the steps:
(1) adopting plasma spray coating process to spray the bilayer structure thermal barrier coating successively through the matrix surface after purification and the activation treatment;
(2) adopt induction heating auxiliary laser remelting recombining process that the bilayer structure thermal barrier coating is carried out remelting.
2. one step of a kind of plasma spraying bilayer structure thermal barrier coating by laser according to claim 1 remelting reinforcing process method is characterized in that in the described step (1), the surface layer of bilayer structure thermal barrier coating is the surface ceramic layer, and the middle layer is metal bonding coating.
3. one step of a kind of plasma spraying bilayer structure thermal barrier coating by laser according to claim 1 remelting reinforcing process method is characterized in that described matrix is nickel base superalloy, and described surface ceramic layer is ZrO
2Base ceramic material, metal bonding coating are the McrAlY alloy.
4. a kind of plasma spraying bilayer structure thermal barrier coating by laser according to claim 1 remelting one goes on foot reinforcing process method; it is characterized in that described plasma spray coating process is selected from a kind of in air plasma spraying, protective atmosphere plasma spraying, vacuum plasma spray coating, the steady plasma spraying of water.
5. one step of a plasma spraying bilayer structure thermal barrier coating by laser as claimed in claim 1 remelting is strengthened the device of processing, it is characterized in that, comprise load coil, laser head, high frequency induction heater, described high frequency induction heater links to each other with load coil, load coil is fixed on the laser head, and the laser of laser head emission is positioned at the heating region central authorities of load coil.
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| CN104164643A (en) * | 2014-08-18 | 2014-11-26 | 南京理工大学 | Thermal barrier coating with bonding layer in net structure and preparation method of thermal barrier |
| EA027062B1 (en) * | 2014-12-15 | 2017-06-30 | Белорусский Национальный Технический Университет | Method for production of a heat-protection coating |
| CN104762586A (en) * | 2015-04-24 | 2015-07-08 | 安徽工程大学 | Workpiece hot spraying technology and spraying device thereof |
| CN104928675A (en) * | 2015-07-02 | 2015-09-23 | 江苏大学 | Special device for one-step remelting of turbine blade thermal barrier coating |
| CN107326318A (en) * | 2017-06-28 | 2017-11-07 | 西安交通大学 | A kind of laser remolten thermal barrier coating preparation technology for suppressing single crystal substrate recrystallization |
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| CN114807822A (en) * | 2022-03-03 | 2022-07-29 | 山东大学 | Laser microtexture modified thermal barrier coating for delaying growth of interface TGO and preparation process thereof |
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