C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/58 (2006.01) C04B 35/584 (2006.01) C04B 35/593 (2006.01) C04B 35/80 (2006.01)
Patent
CA 2100958
2100958 9214685 PCTABS00015 A dense, self-reinforced silicon nitride ceramic prepared by pressureless sintering or low pressure gas sintering. The composition comprises (a) silicon nitride, at least 20 percent of which is in the form of .beta.-silicon nitride whiskers having a high average aspect ratio, (b) from 2 to 10 weight percent of a glassy grain boundary phase containing magnesium oxide, yttrium oxide, silica, zirconia, and optionally, one oxide selected from the group consisting of calcium, gallium, indium and hafnium oxides, and (c) a second crystalline phase in an amount ranging from 0.5 to 5.0 weight percent comprising zirconium oxide, and (d) crystalline phases of metal zirconium silicide and/or metal zirconium silicon nitride in a combined amount from 0.1 to 3.0 weight percent, wherein the metal is tantalum, calcium, hafnium, gallium or indium, and wherein, when the metal is calcium, hafnium, gallium or indium, the same metal occurs as the metal oxide in glassy phase. The ceramic exhibits high fracture toughness and high fracture strength and has a density of at least 98 percent theoretical.
Smart & Biggar
The Dow Chemical Company
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