Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1980-02-22
1981-12-01
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 328R, 260 336UA, 260 4252, C08K 510
Patent
active
043035701
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: 3906617 (1975-09-01), Behringer et al.
Chemical Abstracts, vol. 83, 1975, 107639f.
Agrawal Suphal P.
Weisert Edward D.
Geldin Max
Jacobs Lewis T.
Rockwell International Corporation
Silberberg Charles T.
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