Electrically insulating substrate and a method of making such a

Details Electrically insulating substrate and a method of making such a Electrically insulating substrate and a method of making such a

1980-11-05

1983-01-25

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

264 65, 501 89, 501 90, C04B 3556, C22C 2900

Patent

active

043704212

ABSTRACT:
From 0.1 to 3.5% by weight of beryllium oxide powder, calculated as beryllium, is added to silicon carbide powder containing up to 0.1% by weight of aluminum, up to 0.1% by weight of boron and up to 0.4% by weight of free carbon, and the mixed powder is pressure-molded. The resulting molded article is heated to a temperature of 1,850.degree. C. to 2,500.degree. C. till there is obtained a sintered body having at least 90% relative density of silicon carbide. Thus, the sintered body having thermal conductivity of at least 0.4 cal/cm.sec..degree. C. at 25.degree. C., electrical resistivity of at least 10.sup.7 Ohm.cm at 25.degree. C. and coefficient of thermal expansion of 3.3.about.4.times.10.sup.-6 /.degree.C. at 25.degree. C. to 300.degree. C. can be obtained.

REFERENCES:
patent: 3205080 (1965-09-01), Ryshkewitch
patent: 3993602 (1976-11-01), Prochazka
patent: 4023975 (1977-05-01), Prochazka
patent: 4123286 (1978-10-01), Coppola et al.
patent: 4141726 (1979-02-01), Yajima et al.
patent: 4172109 (1979-10-01), Smoak
Blodgett, A. J. et al., "Composite Structures for Modifying Coefficient of Expansion", IBM Technical Disclosure Bull. 11 (11), Apr. 1969.
Chem. Abstr. 94 (Feb. 23, 1981), p. 291, 51821s, "Silicon Carbide Sinter".
Jpn. Kokai Tokkyo Koho, 80, 85,469 patent application of Japan pub'd. 06/27/80.

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