Metal fusion bonding – Process – Metal to nonmetal with separate metallic filler
Patent
1988-08-25
1990-07-24
Godici, Nicholas P.
Metal fusion bonding
Process
Metal to nonmetal with separate metallic filler
228118, 228215, 416241B, 428634, 428635, B23K 119, B23K10316
Patent
active
049429990
ABSTRACT:
Composite bodies comprise a metallic member and a ceramic member integrally joined together by joining a projection of the ceramic member to a recess of the metallic member. Their joining strength is improved by substantially limiting brazing metal to an interface between the outer peripheral surface of the projection of the ceramic member and the innner peripheral surface of the recess of the metallic member. The joining strength is also improved by forming a groove around the outer periphery of the metallic member at the joined end. The joining strength is also improved by providing a space or an intermediate member between a tip end surface of the projection and a bottom surface of the recess and attaining the relation: ##EQU1## in which G, L.sub.1, .alpha., .alpha.', T.sub.S and T.sub.R are the thickness of the space or the intermediate member, a distance from the bottom surface of the recess of the metallic member to the joining end, a coefficient of thermal expansion of the metallic member, a coefficient of thermal expansion of the ceramic member, a solidifying temperature of the brazing metal, and room temperature, respectively. The joining strength is also improved by radially enlarging the recess near the opening and thinning the brazing metal toward the opening of the recess.
REFERENCES:
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patent: 4747722 (1988-05-01), Kawaguchi et al.
patent: 4761117 (1988-08-01), Oda et al.
patent: 4778345 (1988-10-01), Ito et al.
patent: 4798320 (1989-01-01), Fang
Ando Takashi
Nakasuji Yoshizumi
Oda Isao
Soma Takao
Tsuno Nobuo
Godici Nicholas P.
Heinrich Samuel M.
NGK Insulators, Inc.
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