Method of making silicon nitride-silicon carbide composite filters
AssigneeCorning Incorporated
InventorKishor P. Gadkaree
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Abstract
A process for forming a porous silicon nitride-silicon carbide body, the process comprising (a) forming a plasticizable batch mixture comprising (1) powdered silicon metal; (2) a silicon-containing source selected from the group consisting of silicon carbide, silicon nitride and mixtures thereof; (3) a water soluble crosslinking thermoset resin having a viscosity of about 50-300 centipoise; and, (4) a water soluble thermoplastic temporary binder; (b) shaping the plasticizable batch mixture to form a green body; (c) drying the green body; (d) firing the green body in nitrogen at a temperature of 1400° C. to 1600° C. for a time sufficient to obtain a silicon nitride-silicon carbide structure.
Claims8
A process for forming a porous silicon nitride-silicon carbide body, the process comprising:
- (a) forming a plasticizable batch mixture comprising:
- (1) powdered silicon metal;
- (2) a silicon-containing source selected from the group consisting of silicon carbide, silicon nitride and mixtures thereof;
- (3) a water soluble crosslinking thermoset resin having a viscosity of about 50-300 centipoise;
- and,
- (4) a water soluble thermoplastic temporary binder;
- (b) shaping the plasticizable batch mixture to form a green body;
- (c) drying the green body;
- (d) firing the green body in nitrogen at a temperature of 1400° C. to 1600° C. for a time sufficient to obtain a silicon nitride-silicon carbide structure.
Dependencies are inferred from the claim text.