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US 5,672,302 AGranted
In-situ surface nitridation of zirconia ceramics
AssigneeEastman Kodak Company
InventorsDilip K. Chatterjee, Syamal K. Ghosh, Gregory S. Jarrold
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Abstract
A method for preparing a ceramic article, the method comprising the steps of: 1) compacting a mixture of particulate zirconium diboride and a zirconium oxide or zirconium oxide alloy or composite thereof which results in the formation of a block and 2) sintering the block in a mixture of nitrogen and hydrogen to form a ceramic with a core comprising zirconia and a shell comprising zirconium nitride.
Claims12
A method for preparing a ceramic article comprising:
- compacting a mixture of zirconia alloy and zirconium diboride to form a block and;
- sintering said compact in an atmosphere of from 3 to 5 mole % hydrogen and 97 to 95 mole % nitrogen gas mixture at a temperature of 1200.degree. to 1600.degree. C.;
- whereby said prepared ceramic article has a core comprising sintered particles of zirconium oxide alloy and a shell consisting essentially of sintered particles of ZrN.
Dependencies are inferred from the claim text.