Sintered self-reinforced silicon nitride

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

1993-05-18

1994-05-17

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 95, 501 98, 264 65, C04B 3558

Patent

active

053127854

ABSTRACT:
A dense, self-reinforced silicon nitride ceramic body and a method of making such body. The body has a composition that includes: (a) silicon nitride; (b) a glassy grain boundary phase containing oxygen, nitrogen, magnesium, yttrium, silicon, zirconium, and at least one of titanium and aluminum; and (c) a second crystalline phase containing zirconium oxide; 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 percent of theoretical.

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