Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1984-04-30
1986-10-07
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
252 12, 252 122, 264112, 264171, B27J 500
Patent
active
046158545
ABSTRACT:
The present invention relates to a method of making a tape suitable for impregnation into a porous metal matrix which generally comprises the steps of mixing a liquid dispersion of PTFE with a coagulant to form a paste, placing the paste between a layer of supporting material and a layer of filter paper to form a sandwich, compressing the sandwich, transferring the sandwich to a gauze-like material so that the filter paper layer of the sandwich is adjacent the gauze-like material, applying a vacuum to the gauze-like material and adjacent filter paper layer to remove some excess liquid from the paste, and removing the layer of filter paper from the sandwich to leave a tape comprising PTFE and liquid and a layer of supporting material adjacent the tape. The method of the present invention may be used to apply, by impregnation, a PTFE based composition, which may include various fillers therein, to a porous metal matrix or interlayer. In addition, some of the PTFE based composition may be left above the porous metal interlayer after the impregnation step. After sintering, a composite bearing material which may include a metal backing, a porous metal interlayer on the metal backing, and having the PTFE based composition substantially filling the pores of the porous metal interlayer and forming a surface layer on the bearing material may thereby be produced.
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Preliminary Information about Teflon-Fabrication of Sheeting and Tape by the HS-10 Process-E. I. du Pont de Nemours & Co., (10 pages), Date Unknown.
HS-10 Process (25 pages), Date Unknown.
Montpetit Michael C.
Pratt George C.
Czaja Donald
Federal-Mogul Corporation
Fertig Mary Lynn
Hess Robert F.
Shurupoff Lawrence J.
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