Process for producing a non-dense sintered ceramic molded body having at least two layers

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United States of America Patent

PATENT NO 10391671
APP PUB NO 20150246459A1
SERIAL NO

14391042

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Abstract

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A process for producing a non-dense sintered ceramic molded body having at least two layers, wherein a first powdery ceramic material forming a layer is contacted with at least a second powdery material forming at least a second layer; said first powdery material has a presintering temperature T1 that is higher than the presintering temperature Ts of said at least second powdery ceramic material; the course of a curve of shrinkage S1 of said at least first powdery ceramic material differs from the course of a curve of shrinkage S2 of said at least second powdery material, wherein curve of shrinkage S1 is shifted towards higher temperatures as compared to curve of shrinkage S2; and the layers are subjected to a common temperature treatment at a presintering temperature Ts that is lower than the presintering temperature T1 and at least equal to T3 to cause sintering that remains in a stage of sintering that has not proceeded to the theoretical density; wherein the curve of shrinkage S1 is modified by admixing at least one component having a curve of shrinkage S3 which material is compatible with said powdery ceramic material into said first powdery ceramic material, i. e. has a grain size smaller than the first powdery ceramic material, to equalize the curves of shrinkage S1 and S2 in the region of the presintering temperature Ts.

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Patent Owner(s)

Patent OwnerAddress
VITA ZAHNFABRIK H RAUTER GMBH & CO KG79713 BAD SÄCKINGEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dorn, Michael Bad Sackingen, DE 17 90
Godiker, Michael Bad Sackingen, DE 3 38
Thiel, Norbert Bad Sackingen, DE 36 414
Tholey, Michael Bad Sackingen, DE 9 38

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