C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 33/28 (2006.01) C04B 35/593 (2006.01) C04B 35/645 (2006.01) C04B 35/71 (2006.01)
Patent
CA 2074516
2074516 9111407 PCTABS00006 A method of producing crack free ceramic parts having large cross-sections is disclosed. An initial mixture of ceramic powder containing a binder and from 0.1 v/o to 10 v/o of whiskers or fibers which are made of carbon, graphite or high temperature melting or decomposition point organic polymers. The mixture is either injection molded or slip cast to form a shaped article. The shaped article is heated in a nitrogen atmosphere to a temperature of 450 ·C and then in an atmosphere of air at a temperature of 450 ·C to 600 ·C to completely remove the binder. The resulting binderless shaped article is then heated at 800 ·C for a period of time sufficient to completely remove the whiskers or fibers from the shaped articles. The article is then encapsulated in glass and hot isostatically pressed at a pressure of 30,000 psi to densify the article to approximately 99 % of theoritical. The resulting article has a complex geometry and a large cross-section but without detrimental cracks.
Bandyopadhyay Gautam
French Kenneth
Lieberman Sheldon
Bandyopadhyay Gautam
French Kenneth
Gte Laboratories Incorporated
Lieberman Sheldon
R. William Wray & Associates
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