Alkali metal oxide free backers for energy beam drilling

Details Alkali metal oxide free backers for energy beam drilling Alkali metal oxide free backers for energy beam drilling

1981-03-02

1983-05-31

Albritton, C. L.

Electric heating

Metal heating

By arc

B23K 2700

Patent

active

043862578

ABSTRACT:
To prevent corrosion in subsequent high temperature exposure, backers for electron beam hole drilling of nickel base superalloys contain glass particulates of the borosilicate and aluminosilicate types, having an alkali metal oxide content of less than 1 weight percent and a heavy metal (Pb, Bi, Sn, Sb, As) content of less than 25 ppm. Preferably the binder is a soluble inorganic material, such as magnesium dichromate or a polymer, also free of alkali metal content.

REFERENCES:
patent: 3640907 (1972-02-01), Bizzarri
patent: 3649806 (1972-03-01), Konig
patent: 3974107 (1976-08-01), Carcia
patent: 4156807 (1979-05-01), Howard et al.
patent: 4239954 (1980-12-01), Howard et al.
patent: 4273822 (1981-06-01), Bube

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