Backers having glass particulates for electron beam hole drillin

Details Backers having glass particulates for electron beam hole drillin Backers having glass particulates for electron beam hole drillin

1981-03-02

1983-03-29

Albritton, C. L.

Electric heating

Metal heating

By arc

B23K 1500

Patent

active

043784810

ABSTRACT:
Backers for electron beam hole drilling contain glass particulates with a binder. For nickel base alloys, the glass particulates have at least 7 weight percent low temperature constituent, with a melting point less than 1500.degree. C., and a balance of high temperature constituent having a vaporization point of greater than 2000.degree. C. at 1 atmosphere. Softening points of the glasses exceed 700.degree. C. and preferably are in the range 800.degree.-1000.degree. C. A useful glass will have a viscosity of at least about 10 Pa.multidot.s when it melts. More preferred silicate glasses contain by weight percent at least 8Al.sub.2 O.sub.3, 9CaO, and 3B.sub.2 O.sub.3.

REFERENCES:
patent: 3527649 (1970-09-01), Sullivan
patent: 3649806 (1972-03-01), Konig
patent: 4147835 (1979-04-01), Nishino et al.
patent: 4156807 (1979-05-01), Howard et al.
patent: 4193808 (1980-03-01), Khodsky et al.
patent: 4239954 (1980-12-01), Howard et al.
patent: 4273822 (1981-06-01), Bube

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