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US 4,784,818 AGranted
Method for molding superplastic ceramic
AssigneesAgency of Industrial Science and Technology, Ministry of International Trade & Industry
InventorsFumihiro Wakai, Shuzo Kanzaki, Shuji Sakaguchi
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Abstract
A shaped article of superplastic ceramic composed of zirconia toughened ceramic containing, or not containing, fine alumina powder is produced by deforming the ceramic under the action of stress at a temperature in the range of superplastic temperatures thereof.
Claims6
A method for the production of a shaped ceramic article, comprising:
- subjecting a preliminarily sintered shaped article of a zirconia-toughened ceramic, which exhibits an elongation of not less than 100%, as determined by the uniaxial tensile test, and which contains not less than 20% by volume of zirconia grains, to a stretching stress at a strain rate of not more than 10.sup.-2 sec..sup.-1 over the temperature range of 1200.degree. to 1600.degree. C., thereby superplastically deforming the zirconia-toughened ceramic and obtaining a shaped article of improved surface roughness and dimensional accuracy.
Dependencies are inferred from the claim text.