C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/58 (2006.01) B23B 27/00 (2006.01) C04B 35/14 (2006.01) C04B 35/50 (2006.01) C04B 35/593 (2006.01) C04B 35/645 (2006.01) C04B 35/80 (2006.01)
Patent
CA 2049204
ABSTRACT A process for preparing a self-reinforced sil- icon nitride ceramic body of high fracture toughness by hot-pressing a powder mixture containing silicon nitride and three other components under conditions such that densification and the in situ formation of .beta.-silicon nitride whiskers having a high aspect ratio occur. The other components are silicon dioxide as a densification aid, a conversion aid such as yttrium oxide and a compound, such as calcium oxide, which enhances growth of .beta.-silicon nitride whiskers. The resultant silicon ni- tride ceramic has a .beta.-silicon nitride crystalline phase, at least 20 volume percent of which is in the form of whiskers or elongated grains having an average aspect ratio of at least about 2.5, and a glassy second phase. The glassy phase contains the silicon dioxide, the conversion aid and the compound which enhances growth of .beta.-silicon nitride whiskers. The glassy phase may also include a minor amount of aluminum nitride or boron nitride. 38,880-F
Pyzik Aleksander J.
Pyzik Barbara M.
Smart & Biggar
The Dow Chemical Company
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