II New Patents

4778548 4780301

BONDING WOVEN CARBON FABRIC FRICTION MATERIALS

PROCESS FOR PRODUCING CARBON FIBER

Joseph Fox, David East

A porous, woven carbon fabric friction material is bonded to a solid substrate, such as a conical transmission synchronizer, with a high tempera- ture thermosetting adhesive, such as a synthetic rubber-phenolic resin base adhesive. Prior to ap- plying the adhesive, a thin layer of one surface of the friction material is removed, such as by con- tacting the surface with a band-type sander, to break through the pyrolytic carbon coating on the substantial portion of the carbon fibers. The adhesive is applied to the abraded surface of the friction material and/era roughened surface on the solid substrate, the friction material is clam- ped to the solid substrate and the thus-assembled parts are heated to at least substantially cure the adhesive. Improved bonds between the adhesive and friction material are produced and a ten- dency for the adhesive to bleed through the pores of the friction material and migrate to the fric- tion surface during curing is significantly reduced.

Munetsugu Nakatani, Toha Kobayashi, Yoshitaka Imai, Nobuyuki Yamamoto, Susumu Sasaki, Ohtake, Japan assigned to Mitsubishi Rayon Co Ltd

The invention relates to a process for producing carbon fibers which comprises a continuous flame-resisting treatment of acrylic fibers in bun- dle form containing at least 90% by weight of ac- rylonitrile in an oxidizing atmosphere at temperatures of 250 degrees to 350 degrees C. by using a plurality of flame-resisting furnace dif- ferent in heat treatment temperature under such conditions that the fiber density rhon after each stage of flame-resisting treatment may be main- tained on the level defined by a specific condi- tional expression and so that the fiber density rhok after completion of the flame-resisting treatment may be from 1.34 to 1.40 g/ml, and successively are subjected to carbonizing treat- ment in an inert atmosphere.

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