Modified cordierite glass ceramic composite

Details Modified cordierite glass ceramic composite Modified cordierite glass ceramic composite

1986-03-12

1987-12-08

Lander, Ferris H.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 32, 501 56, 501 73, 501 95, 501 97, 65 33, C03C 1008

Patent

active

047118601

ABSTRACT:
A composite glass ceramic material which comprises silicon nitride (Si.sub.3 N.sub.4) whiskers in a glass ceramic material comprising nitrogen doped cordierite, which composite material has greatly increased strength at elevated temperatures, good microwave transparency, and good thermal shock resistance.
The invention further comprises a method for manufacturing the composite material by blending ground nitrogen doped cordierite glass with between about 5 and about 50 percent Si.sub.3 N.sub.4 whiskers by weight of glass. The blend is then formed into a desired shape and is sintered at an elevated temperature of from about 1000.degree. to 1400.degree. C.
The invention also includes the novel nitrogen doped cordierite glass and glass ceramic made therefrom.

REFERENCES:
patent: 4069058 (1978-01-01), Washburn
patent: 4101616 (1978-07-01), Buljan
patent: 4542109 (1985-09-01), Pasto

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