Heat-resistant sealing materials

Details Heat-resistant sealing materials Heat-resistant sealing materials

C - Chemistry, Metallurgy

03

C

261/21, 261/24,

C03C 3/12 (2006.01) C03C 3/15 (2006.01) C03C 3/19 (2006.01) C03C 8/24 (2006.01) C04B 37/00 (2006.01) C04B 37/02 (2006.01) H01J 61/36 (2006.01)

Patent

CA 1110279

ABSTRACT Sealing materials for making heat-resistant seals in electrical discharge devices comprise a rare earth oxide, such as lanthanum oxide, and boric oxide, preferably together with minor amounts of phosphorus pentoxide, aluminium oxide and magnesium oxide. Preferred compositions comprise 55 to 95 % lanthanum or other oxide, 5 to 45% boric oxide and 0 to 5 % phos- phorus pentoxide, 0 to 5 % aluminium oxide and 0 to 5 % magnesium oxide. The compositions can be made by mixing the oxides, or appropriate salts, calcining the mixture at up to 1200°C and crushing it to a powder. They may be used as frits in a slurry or formed into pressed elements such as discs or washers. Sealing can be accomplished by heating the surfaces to be joined, together with the interposed sealing composi- tion, to a temperature between 1100 and 1650°C.

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