Method for producing high strength sintered silicon carbide
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsKatsuhiko Honma, Tsuneo Tatsuno, Hiroshi Okada
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Abstract
A method for producing a high strength sintered silicon carbide, the method comprising: molding a mixture of silicon carbide powder and a sintering aid into a green compact of a predetermined shape: preliminarily sintering the green compact to obtain a preliminarily sintered compact having a relative density higher than 80%; charging the preliminarily sintered compact in a HIP equipment without using a capsule; and subject the preliminarily sintered compact to a HIP treatment in a high-temperature and high-pressure N.sub.2 gas atmosphere maintaining a pressure higher than 500 atms and a temperature in the range of 1400.degree.-2300.degree. C.
Claims5
A method for producing a high strength sintered silicon carbide, the method comprising:
- molding a mixture of silicon carbide powder and at least one sintering aid into a green compact of a predetermined shape;
- preliminarily sintering said green compact to obtain a preliminarily sintered compact having a relative density higher than 80%;
- charging said preliminarily sintered compact in a hot isostatic pressing equipment without using a capsule;
- and
- subjecting said preliminarily sintered compact to a hot isostatic pressing treatment in a high-temperature and high-pressure N.sub.2 gas atmosphere maintaining a pressure higher than 500 atms and a temperature in the range of 1400.degree.-2300.degree. C. whereby said silicon carbide reacts with said N.sub.2 to form a layer of silicon nitride.
Dependencies are inferred from the claim text.