Dispersion toughened ceramic composites and method for making sa

Stock material or miscellaneous articles – Composite – Of silicon containing

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427249, 427255, 4272551, 428450, 428698, B32B 904

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active

045980241

ABSTRACT:
Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa.sqroot.m which represents a significant increase over that of silicon carbide.

REFERENCES:
patent: 4039997 (1977-08-01), Huang et al.

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