Brazing eutectic and method

Metal fusion bonding – Process – Metal to nonmetal with separate metallic filler

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Details

22826312, 73304R, 738665, 420502, H01B 1730, B23K 104

Patent

active

047141891

ABSTRACT:
A sensor for assessing conditions within a metallic high pressure boiler 10, has a sensitive tip section 12, which is insulated from the boiler by virtue of a ceramic spacing member 101. The joins between the member 101 and sensor body 15 and tip 12 respectively are subject to full boiler pressure. The present invention provides a pressure seal by virtue of forming a brazed seal between the parts by forming a ceramic component to be brazed in a ceramic of average gain size of substantially between 5 and 15 microns and of purity exceeding 99% with a maximum silica content of substantially 0.2%, introducing between components a eutectic of substantially the composition: 80% to 90% silver; 5% to 6% copper; less than 6% titantium; and sufficient in quantity to fill gap therebetween, and subjecting the components to a temperature in excess of eutectic liquids temperature while maintaining the components in a vacuum.

REFERENCES:
patent: 1977898 (1934-10-01), Seniff
patent: 2917140 (1959-12-01), Omley
patent: 3055465 (1962-09-01), Pulfrich et al.
patent: 4180700 (1979-12-01), Kraska et al.
patent: 4507521 (1985-03-01), Goellner
patent: 4540479 (1985-09-01), Sakurai et al.
patent: 4591535 (1986-05-01), Mizuhara
patent: 4623513 (1986-11-01), Mizuhara

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