Silicon nitride-ceramic and a manufacturing method therof

Details Silicon nitride-ceramic and a manufacturing method therof Silicon nitride-ceramic and a manufacturing method therof

1988-02-05

1989-12-12

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 48, 264 60, C04B 3558

Patent

active

048867675

ABSTRACT:
A silicon nitride-ceramic is composed of a sintered body including silicon nitride and an additive, and has a columnar crystal of .beta. type silicon nitride substantially parallel to one plane. A method for manufacturing a silicon nitride-ceramic comprises the steps of forming first powder including a needle-shaped crystal of .beta. type silicon nitride by mixing the needle-shaped crystal of the .beta. type silicon nitride with second silicon nitride powder mainly of .alpha. type including an additive, or by heating the second silicon nitride powder at temperature 1500.degree. to 1750 .degree. C. in advance; and sintering the first powder at a predetermined temperature under non-oxidation atmosphere.

REFERENCES:
patent: 3432295 (1969-03-01), Frank et al.
patent: 3442997 (1969-05-01), Parratt
patent: 4563433 (1986-01-01), Yeckley et al.
patent: 4696710 (1987-09-01), Minjolle et al.
Weston, "Origin of strength anisotropy in hot-pressed silicon nitride," Journal of Material Science 15, 1980, pp. 1568-1776.
Lange, "Relation Between Strength, Fracture Energy, and Microstructure of Hot-Pressed Si.sub.3 N.sub.4," Journal of the American Ceramic Society, vol. 56, No. 10, Oct. 1973, pp. 518-522.
Nuttall, et al., "Observations on the microstructure of Hot-pressure silicon nitride," Journal of Materials Science, 9, 1974, pp. 850-853.

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