Sintered self-reinforced silicon nitride

Details Sintered self-reinforced silicon nitride Sintered self-reinforced silicon nitride

C - Chemistry, Metallurgy

03

C

C03C 10/02 (2006.01) C04B 35/58 (2006.01) C04B 35/584 (2006.01) C04B 35/591 (2006.01) C04B 35/593 (2006.01) C04B 35/80 (2006.01)

Patent

CA 2162379

A dense, self-reinforced Si3N4 ceramic body and a method of making such body. The body has a composition that includes: (a) Si3N4; (b) a glassy grain boundary phase containing oxygen, nitrogen, Mg, Y, Si, Zr, and at least one of Ti and Al; and (c) a second crystalline phase containing ZrO2; and (d) crystalline phases of metal zirconium silicide and/or metal zirconium silicon nitride. The ceramic exhibits high fracture toughness and high fracture strength and has a density at least 98 % of theoretical.

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