Thermal shock-resistant alumina-mullite composite material and p

Details Thermal shock-resistant alumina-mullite composite material and p Thermal shock-resistant alumina-mullite composite material and p

1997-06-10

1998-12-08

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501118, 501122, 501125, 501119, 501128, 501105, 428689, 428697, 428699, 264 66, C04B 3510, C04B 3514, C04B 3516

Patent

active

058468919

ABSTRACT:
A thermal shock-resistant alumina-mullite composite material and a preparation method thereof which are capable of concurrently obtaining the compactness of the material and a mullite formation. The material is comprised of 4.about.30 weight % of one aluminum silicate selected from the group consisting of kaolinite, silimanite, and kyanite, 75.about.94 weight % of Al.sub.2 O.sub.3 based on the total amount of Al.sub.2 O.sub.3, and 0.5.about.6 weight % of an alkaline earth metal oxide, wherein the weight ratio of the alkaline earth metal oxide to SiO.sub.2 is 1:2.about.1:3. The composition is first sintered at a temperature of 1450.degree..about.1650.degree. C. for 1.about.5 hours, then cooled down to 1000.degree. C., and then crystallized at a temperature of 1200.degree..about.1500.degree. C. for 1.about.20 hours. This composition is usable to a maximum temperature 300.degree. C. as indicated theraml- shock-resistant testing, and is well application to a part subject to wide thermal variation and for which a conventional 85%.about.96% alumina material is not usable.

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patent: 5344800 (1994-09-01), Jackson et al.
Powell-Dogan, C.A. et al., J. Am. Ceram. Soc., 73(12):3684-3691 (1990) (no month).
Travitzky, N.A. et al., Materials Science and Engineering 71:65-70 (1985) (no month).

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