DE19741145C1 - Ceramic component granular structure visualisation method - Google Patents

Ceramic component granular structure visualisation method

Info

Publication number
DE19741145C1
DE19741145C1 DE1997141145 DE19741145A DE19741145C1 DE 19741145 C1 DE19741145 C1 DE 19741145C1 DE 1997141145 DE1997141145 DE 1997141145 DE 19741145 A DE19741145 A DE 19741145A DE 19741145 C1 DE19741145 C1 DE 19741145C1
Authority
DE
Germany
Prior art keywords
ceramic component
granules
granular structure
visualisation
batio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE1997141145
Other languages
German (de)
Inventor
Harald Schoepf
Thomas Trenkler
Lutz Kirsten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Siemens Matsushita Components GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Matsushita Components GmbH and Co KG filed Critical Siemens Matsushita Components GmbH and Co KG
Priority to DE1997141145 priority Critical patent/DE19741145C1/en
Application granted granted Critical
Publication of DE19741145C1 publication Critical patent/DE19741145C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; ceramics; glass; bricks
    • G01N33/388—Ceramics

Abstract

The visualisation method involves using an AgPd powder which is mixed with the BaTiO3 granules. This is done before compression and sintering of the granules for formation of the ceramic component. The spherical powder particles have a diameter of between 1 and 2 microns and allow the visualisation of the granular structure upon examination of the ceramic component by backscattering electron imaging or scanning electron microscopy.

Description

Die Erfindung betrifft ein Verfahren zur Sichtbarmachung von Granulatstrukturen in gepreßten und gesinterten keramischen Bauteilen aus BaTiO3.The invention relates to a method for making granulate structures visible in pressed and sintered ceramic components made of BaTiO 3 .

Die Analyse von Defektursachen in Grünkörpern bzw. gesinter­ ten keramischen Bauteilen ist von großem Interesse, um her­ stellungsbedingte Fehler zu vermeiden. Insbesondere handelt es sich dabei um die Analyse der Ursachen von Defekten im Grünling, der Ursachen von Defekten im gesinterten Bauteil, die Bestimmung der Verdichtung bzw. deren örtliche Variation im Grünling und Analysen zur Rekonstruktion des Sinterprozes­ ses.The analysis of defects in green bodies or sintered ten ceramic components is of great interest to get around to avoid positional errors. In particular acts it is the analysis of the causes of defects in the Green compact, the cause of defects in the sintered component, the determination of the compression or its local variation in the green compact and analyzes for the reconstruction of the sintering process ses.

Aus der US 4,414,844 ist ein Verfahren zur schnellen Bestim­ mung des Isolationswiderstandes von wismuthaltigen Keramik­ kondensatoren bekannt, wozu intergranulare bzw. transgranu­ lare Brüche im Keramikgefüge bestimmt werden.No. 4,414,844 describes a method for quick determination insulation resistance of bismuth-containing ceramics capacitors known, intergranular or transgranu Lare breaks in the ceramic structure can be determined.

Aus der JP 09-178736 A (veröffentlicht in "Patent Abstracts of Japan") ist eine Methode zur Inspektion von Betonober­ flächen bekannt, die Beschädigungen der Oberfläche erkennen läßt.From JP 09-178736 A (published in "Patent Abstracts of Japan ") is a method for inspection of concrete surfaces known areas that recognize damage to the surface leaves.

Aufgabe der vorliegenden Erfindung ist es daher, ein Verfah­ ren anzugeben, das die Entwicklung des Granulengefüges nach dem Pressen durch alle Herstellungsphasen hindurch (Binder­ ausbrand und Sintern) an ein und demselben Bauteil gestattet.The object of the present invention is therefore a method ren to indicate the development of the granule structure pressing through all production phases (Binder burnout and sintering) on one and the same component.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß einem BaTiO3-Granulat vor dem Verpressen ein Pulver aus AgPd zuge­ mischt wird.This object is achieved in that a BaTiO 3 granulate is mixed with a powder of AgPd before pressing.

Die Vorteile des Gegenstandes der Erfindung werden anhand der folgenden Ausführungsbeispiele näher erläutert.The advantages of the object of the invention will become apparent from the following exemplary embodiments explained in more detail.

Ein BaTiO3-Sprühgranulat wird mit einer adäquaten Menge eines AgPd-Pulvers (mittlerer Durchmesser 1-2 µm, sphärisch) gleichmäßig vermischt, so daß die Metallpartikel auf der Oberfläche der Granulen haften. Das so präparierte Granulat kann in die gewünschte Form gepreßt werden. A BaTiO 3 spray granulate is mixed uniformly with an adequate amount of an AgPd powder (average diameter 1-2 μm, spherical), so that the metal particles adhere to the surface of the granules. The granules prepared in this way can be pressed into the desired shape.

Im Schliffbild des Grünkörpers kann die Granulatstruktur im Lichtmikroskop dargestellt werden.In the micrograph of the green body, the granulate structure in the Light microscope are shown.

Ebenso kann im gesinterten Bauteil im BEI (Backscattering Electron Image) die Granulatstruktur dargestellt und der Sin­ terprozeß rekonstruiert werden.Likewise, in the sintered component in the BEI (backscattering Electron Image) the granulate structure and the Sin be reconstructed.

Bei Verwendung von monomodalen Granulaten bzw. Granulaten mit schmaler Verteilung kann relativ einfach von der Deformation der Granulen im Grünling auf die Verdichtung geschlossen wer­ den.When using monomodal granules or granules with Narrow distribution can be relatively easy from the deformation of the granules in the green compact on the compression the.

Das Verfahren nach der Erfindung ermöglicht es, Grünlinge und gesinterte Bauteile aus BaTiO3-Keramik zur erzeugen, bei de­ nen die ursprüngliche Granulatstruktur des Pulvers sowohl nach dem Verpressen als auch nach dem Sintern sichtbar ge­ macht werden kann. Da das AgPd-Pulver mit der BaTiO3-Keramik nicht reagiert, bleibt die Umrißstruktur der Granulen selbst nach dem Sintern erhalten und kann im BEI visualisiert wer­ den. Weiterhin ist es auch möglich, Schliffe von gesinterten Keramikkörpern mittels REM (Rasterelektronenmikroskop) zu un­ tersuchen.The method according to the invention makes it possible to produce green compacts and sintered components made of BaTiO 3 ceramic, in which the original granulate structure of the powder can be made visible both after pressing and after sintering. Since the AgPd powder does not react with the BaTiO 3 ceramic, the outline structure of the granules is retained even after sintering and can be visualized in the BEI. Furthermore, it is also possible to examine sections of sintered ceramic bodies using SEM (scanning electron microscope).

Claims (2)

1. Verfahren zur Sichtbarmachung von Granulatstrukturen in gepreßten und gesinterten keramischen Bauteilen aus BaTiO3, dadurch gekennzeichnet, daß einem BaTiO3-Granulat vor dem Verpressen ein Pulver aus AgPd zugemischt wird.1. A process for the visualization of granule structures in pressed and sintered ceramic components made of BaTiO 3 , characterized in that a powder of AgPd is added to a BaTiO 3 granulate before pressing. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß sphärische Pulverpartikel mit einem durchschnittlichen Durchmesser von 1-2 µm verwendet werden.2. The method according to claim 1, characterized, that spherical powder particles with an average Diameters of 1-2 µm can be used.
DE1997141145 1997-09-18 1997-09-18 Ceramic component granular structure visualisation method Expired - Fee Related DE19741145C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997141145 DE19741145C1 (en) 1997-09-18 1997-09-18 Ceramic component granular structure visualisation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997141145 DE19741145C1 (en) 1997-09-18 1997-09-18 Ceramic component granular structure visualisation method

Publications (1)

Publication Number Publication Date
DE19741145C1 true DE19741145C1 (en) 1999-05-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE1997141145 Expired - Fee Related DE19741145C1 (en) 1997-09-18 1997-09-18 Ceramic component granular structure visualisation method

Country Status (1)

Country Link
DE (1) DE19741145C1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414844A (en) * 1981-07-24 1983-11-15 Avx Corporation Rapid insulation resistance test for bismuth-containing ceramic capacitors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414844A (en) * 1981-07-24 1983-11-15 Avx Corporation Rapid insulation resistance test for bismuth-containing ceramic capacitors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 09178736 A In: Patent Abstr. of Japan *

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: EPCOS AG, 81541 MUENCHEN, DE

8339 Ceased/non-payment of the annual fee