Graphite-loaded silicon carbide
AssigneeAlumina Ceramics Co. (ACI)
InventorsLloyd G. Talbert, Stephen M. Brazil
Life of this patent
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Abstract
A silicon carbide ceramic body having a high degree of lubricity as a result of large graphite inclusions in the body. The graphite inclusions have an average size of at least about 100 micrometers. The graphite-loaded silicon carbide component is preferably formed by spray drying graphite particles independent of the silicon carbide, blending the graphite agglomerates and silicon carbide to form a raw batch, forming the raw batch into a green body, and sintering the green body to produce a graphite-loaded silicon carbide ceramic body having good density and good strength.
Claims13
A sintered ceramic body, comprising:
- (a) at least about 5 weight percent graphite inclusions having an average size of at least about 100 micrometers;
- (b) at least about 80 weight percent silicon carbide;
- and
- (c) less than about 0.5 weight percent unreacted silicon metal.
A sintered ceramic body, comprising:
- (a) from about 5 weight percent to about 10 weight percent graphite inclusions having an average size of from about 100 micrometers to about 150 micrometers;
- (b) at least about 85 weight percent silicon carbide;
- and
- (c) less than about 0.5 weight percent unreacted silicon metal;
- wherein the density of said sintered ceramic body is at least about 2.6 g/cc.
A sintered ceramic body, comprising:
- (a) at least about 85 weight percent silicon carbide;
- (b) at least about 5 weight percent graphite inclusions having an average size of at least about 100 micrometers;
- and
- (c) less than about 0.5 weight percent unreacted silicon metal;
- wherein said sintered ceramic body has a density of at least about 2.8 g/cc and a tensile strength of at least about 100 MPa.
Dependencies are inferred from the claim text.