Composite powder comprising silicon nitride and silicon carbide

Details Composite powder comprising silicon nitride and silicon carbide Composite powder comprising silicon nitride and silicon carbide

1996-03-29

1998-06-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 971, 501 972, C04B 35565, C04B 35584

Patent

active

057670250

ABSTRACT:
A composite sintered body of silicon nitride and silicon carbide is manufactured by sintering a composite powder or green body of silicon nitride and silicon carbide in a nitrogen gas atmosphere. The composite powder having a percentage of .alpha.-silicon nitride which is at least 30% based on all silicon nitride is produced by mixing a silicon powder with a carbonaceous powder and a sintering aid powder, and heat-treating the resultant mixed powder in a nitrogen-containing atmosphere at a temperature of 1,450.degree. C. or lower thereby nitriding and carbonizing silicon contained in the mixed powder to produce a composite powder, a temperature elevation speed being less than 2.degree. C./minute. The composite green body having a percentage of .alpha.-silicon nitride which is at least 30% based on all silicon nitride is produced by mixing a silicon powder, a carbonaceous powder and a sintering aid powder, molding the resultant mixed powder into a green body, and heat-treating the resultant green body in a nitrogen-containing atmosphere at a temperature of 1,450.degree. C. or lower thereby nitriding and carbonizing silicon contained in the green body, a temperature elevation speed being less than 2.degree. C./minute.

REFERENCES:
patent: 4800182 (1989-01-01), Iazaki et al.
patent: 5352641 (1994-10-01), Matsui et al.
patent: 5525556 (1996-06-01), Dunmeead et al.
patent: 5559062 (1996-09-01), Okabe et al.
patent: 5618768 (1997-04-01), Higuchi et al.

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