Metal fusion bonding – Process – Metal to nonmetal with separate metallic filler
Patent
1995-10-27
1997-09-09
Heinrich, Samuel M.
Metal fusion bonding
Process
Metal to nonmetal with separate metallic filler
228208, 2282332, 428621, 148528, 403272, B23K 3100
Patent
active
056647239
ABSTRACT:
A method of braze joining a copper member to a substrate of metal or ceramic material is disclosed according to which a diffusion barrier coating as defined is applied to the substrate alone, and a selected brazing alloy is interposed between copper member and substrate, followed by a two-step heating treatment. In the first step the assembly is heated at a temperature and for a time sufficient to melt the brazing alloy and cause a bond to form between the brazing alloy and the copper member and between the brazing alloy and the substrate. In the second step the temperature is raised and maintained in the range from about 600.degree. C. to about 950.degree. C. in a "solutionizing heat treatment" (as defined) for a time sufficient to allow the brazing alloy to form an "extended solid solution" (as defined) with copper in a controlled fashion to convert the bond to a strong joint which is resistant to thermal stress.
REFERENCES:
patent: 4506822 (1985-03-01), Hammersand et al.
patent: 4890783 (1990-01-01), Li
patent: 5490627 (1996-02-01), Krum et al.
Heinrich Samuel M.
Slater Mandel E.
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