Silicon nitride compositions in the Si.sub.3 N.sub.4 -Y.sub.2 O.

Details Silicon nitride compositions in the Si.sub.3 N.sub.4 -Y.sub.2 O. Silicon nitride compositions in the Si.sub.3 N.sub.4 -Y.sub.2 O.

1976-11-23

1978-07-25

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 55, 106 69, 106 732, 106 735, 264 65, C04B 3558

Patent

active

041026985

ABSTRACT:
Dense, ceramic compositions fabricated within the Si.sub.3 N.sub.4 -Si.sub.2 N.sub.2 O-Y.sub.2 Si.sub.2 O.sub.7 compatibility triangle in the Si.sub.3 N.sub.4 -SiO.sub.2 -Y.sub.2 O.sub.3 system are extremely stable in oxidizing environments and particularly suited for use as a high temperature structural material. In addition, the hot-pressed, densified articles fabricated from compositions within the compatibility triangle exhibit improved strength and creep resistance at elevated temperatures relative to commercial Si.sub.3 N.sub.4.

REFERENCES:
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Wills, R. R. - "Silicon Yttrium Oxynitrides", J. Am. Cer. Soc., Oct. 1974, p. 459.
Terwilliger, G. R. et al. - "Hot-Pressing Behavior of Si.sub.3 N.sub.4 " J. Am. Cer. Soc., Jan. 1974, pp. 25-29, (p. 28).
Colquhoun, I. et al., "The Determination of Surface Silica and its Effect on the Hot-Pressing Behavior of Alpha-Silicon Nitride Powder" - Prog. of Brit. Cer. Soc.-No. 22 (1973), pp. 181-195.

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