Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1972-10-10
1976-08-10
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 66, F27B 904, F27B 910
Patent
active
039742490
ABSTRACT:
The present invention provides a high heat resistant, light transmitting, thermal shock resistant and high strength sintered ceramic body containing at least about 98% by weight magnesia-alumina spinel and a method of manufacturing the same which comprises forming a uniform mixture containing approximately equal molar amounts of magnesia and alumina plus lithium fluoride in an amount of about 2% by weight of the mixture, the alumina in the mixture having an average particle size of less than 0.5 microns; calcining the mixture at such a temperature and under such conditions as will result in substantially less than total reaction to form spinel during calcining, i.e. less than 80% and preferably less than 50%; pressing the mixture into a self-sustaining compact having a density of at least about 2 grams per cubic centimeter; and then firing the compact, preferably in a wet hydrogen atmosphere, to a temperature of from about 1600.degree. to 1900.degree.C.
REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 3212401 (1965-10-01), Navias
patent: 3530209 (1970-09-01), Ho
patent: 3531308 (1970-09-01), Bagley
patent: 3768990 (1973-10-01), Sellers et al.
patent: 3862846 (1975-01-01), Smoak et al.
W. T. Bakker et al., "Reactor Magnesia Spinel, Preparation and Properties," Ceramic Bulletin, Nov. 1967, pp. 1094-1097.
P. E. Hart et al., "Densification Mechanisms in Hot Pressing of Magnesia with a Fugitive Liquid," Jour. Amer. Cer. Soc., Feb. '70 pp. 83-86.
Roy Donald W.
Stermole Franklin J.
Arnold Donald J.
Coors Porcelain Company
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