Self-reinforced silicon nitride ceramic of high fracture...

Details Self-reinforced silicon nitride ceramic of high fracture... Self-reinforced silicon nitride ceramic of high fracture...

C - Chemistry, Metallurgy

04

B

25/133, 57/22, 2

C04B 35/581 (2006.01) C04B 35/593 (2006.01) C04B 35/645 (2006.01) C04B 35/80 (2006.01)

Patent

CA 1336914

A process for preparing a self-reinforced sil- icon nitride ceramic body of high fracture toughness comprising hot-pressing a powder mixture containing silicon nitride, magnesium oxide, yttrium oxide and a compound which enhances growth of .beta.-silicon nitride whiskers-under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. A novel silicon nitride ceramic of high fracture toughness and high fracture strength is disclosed comprising a .beta.-silicon nitride crystalline phase wherein at least 20 volume percent of the phase is in the form of whiskers having an average aspect ratio of at least 2.5; a glassy second phase containing a source of magnesium, e.g., magnesium oxide, a source of yttrium, e.g.,yttrium oxide, a compound, such as titanium dioxide, niobium diboride or strontium oxide, which enhances growth of .beta.-silicon nitride whiskers, and silica in a total amount not greater than 35 weight percent; and not greater than 10 weight percent of the total weight as other phases. The glassy phase may also include up to 5.0 weight percent, based upon total weight of the ceramic, of aluminum nitride or boron nitride.

603562

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