Oxidation resistant silicon nitride containing rare earth oxide

Details Oxidation resistant silicon nitride containing rare earth oxide Oxidation resistant silicon nitride containing rare earth oxide

1981-09-18

1982-09-21

Bell, M. L.

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3550, C04B 3558

Patent

active

043507719

ABSTRACT:
Si.sub.3 N.sub.4 polycrystalline ceramic bodies formed from starting materials containing about 2 to 4 weight percent SiO.sub.2, less than 0.1 weight percent cation impurities and Y.sub.2 O.sub.3 in critical amounts exhibit optimum oxidation resistance. Such bodies are useful as engine parts or components or as regenerator structures for waste heat recovery.

REFERENCES:
patent: 3830652 (1974-08-01), Gazza
patent: 4099979 (1978-07-01), Lange et al.
patent: 4102698 (1978-07-01), Lange et al.
Priest, H. F. et al.; "Sintering of Si.sub.3 N.sub.4 Under Nitrogen Pressure," Journal American Ceramic Society, vol. 60, Nos. 1-2, p. 81 (1977).
Rice et al., "Hot Pressed Si.sub.3 N.sub.4 with Zr Based Additions," Journal American Ceramic Society, vol. 58, Nos. 5-6, p. 264 (1975).

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