C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/6
C04B 35/16 (2006.01) C04B 35/56 (2006.01) C04B 35/573 (2006.01)
Patent
CA 1067524
METHOD OF FORMING A SILICON CARBIDE ARTICLE - I ABSTRACT OF THE DISCLOSURE A method of forming a silicon carbide article is disclosed. Selected weight percentages of silicon carbide particles, graphite particles, if desired, and a thermosetting binder are mixed together and molded into an article by molding techniques which operate on the basis that the thermosetting binder forms a continuous medium about all the particles supported therein. The molded article is heated in the absence of oxygen and the thermosetting binder breaks down to form a low density, vitreous carbon phase. The article is heated in an oxygen containing environment to remove excess surface carbon. The article is heated in the absence of oxygen to a selected temperature at which the article is maintained for a period of time in a gaseous environment consisting of nitrogen preferably with a small amount of hydrogen therein. The hydrogen-nitrogen treatment is effective to cleanse the article and insure that there is a sufficient volume of pores throughout the article for a later siliciding operation to be carried out thereon. The article is silicided at an elevated temperature by penetration of the article through its pore structure with a reactable form of silicon. - 1 -
261710
Noakes Jack E.
Sato Hiroshi
Terner Leslie L.
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