Metal fusion bonding – Process – Using bond inhibiting separating material
Patent
1978-08-25
1980-09-02
Husar, Francis S.
Metal fusion bonding
Process
Using bond inhibiting separating material
228157, 228193, 164 14, B23K 2018, B23K 2022
Patent
active
042202760
ABSTRACT:
A method for fabricating superplastically formed/diffusion bonded structures wherein metal blanks of a titanium alloy are joined at selected areas by diffusion bonding and expanded superplastically to form a desired sandwich or integrally stiffened structure. In such method, the metal blanks are treated in selected areas with a "stopoff" material to prevent bonding at those areas during diffusion bonding and to permit forming or shaping at the same areas during superplastic forming. An improved stopoff compound is provided for this purpose, in the form of yttria of relatively coarse particle size, coarser than 5 microns, in a suitable volatilizable vehicle. Such stopoff compound is inert to reactive metals such as titanium at the high diffusion bonding temperatures, and permits relatively low breakthrough pressure-time product during superplastic forming, thereby preventing excessive strain or rupture of the metal through non-superplastic deformation.
REFERENCES:
patent: 3638298 (1972-02-01), Sinizer et al.
patent: 3834000 (1974-09-01), Miller
patent: 3906617 (1975-09-01), Behringer et al.
patent: 3927817 (1975-12-01), Hamilton et al.
patent: 4040845 (1977-08-01), Richerson et al.
Agrawal Suphal P.
Weisert Edward D.
Dachs Louis L.
Geldin Max
Husar Francis S.
Ramsey K. J.
Rockwell International Corporation
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