4617232 Corrosion and wear resistant graphite material

Carbon Vol. 26, No. 1. pp. I-II, 1988 Printed in Great Bntain.

ooO8-6223/88 S3:W + .OO 0 1988 Pergamon Journals Ltd.

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4617232

CORROSION AND WEAR RESISTANT GRAPHITE

MATERIAL

Richard Chandler, Lutfi H Amra, Bedford Hts, OH, United Statee assigned to Kennecott Cor- poration

The invention provides a composite carbon or graphite having desirable properties such as cor- rosion and wear resistance. The invention com- bines a graphite substrate with a protective porous zone of silicon carbide. The whole body of graphite plus silicon carbide then is infiltrated with aluminum phosphate. An adhered barrier of silicon carbide, ranging in thickness between 0.015 and 0.050 inch thick is integrated with a graphite stratum to form a very hard surface, resistant to mechanical and chemical wear. The silicon carbide barrier is closely compatible to the graphite substrate, in resistance to thermal shock and in qualities of thermal expansion. In order to improve oxidation resistance further, a new composition was formed by infiltrating aluminum phosphate through the silicon carbide into the graphite to form a single body of com- posite graphite.

4618463

PROCESS FOR PRODUCING PITCH CARBON FIBERS

Seiich Uemura, Takao Hirose, Yoshio Shohda, Takayoshi Sakamoto, Kenji Katoh, Tokyo, Japan assigned to Nippon Oil Company

Provided is a process for producing pitch carbon fibers by subjecting pitch fibers obtained by melt-spinning a carbonaceous pitch to in-

fusibilization treatment and then to carboniza- tion treatment or both carbonization treatment and subsequent graphitization treatment, characterized in that a dimethyl polysiloxane having a viscosity at 25 degrees C. in the range of 12,000 to 1 ,OOO,OOO cSt is applied to the fibers af- ter the infusibilization treatment, and the in- fusibilized fibers with the dimethyl polysiloxane thus applied thereto are then subjected to the carbonization treatment or both the carboniza- tion treatment and the subsequent graphitiza- tion treatment.

4619796

PROCESS FOR PREPARATION OF POROUS CARBON PLATES

Yasuhir Awata, Osamu Iwaki, Tokyo, Japan as- signed to Oji Paper Company Ltd

Porous carbon plates are made by forming a sheet from a mixture comprising 65-90 weight parts of a carbon fiber-forming organic fiber and lo-35 weight parts of a pulp according to a paper-making method; impregnating the sheet with a solution of an organic polymeric sub- stance to prepare an impregnated sheet; sub- jecting the impregnated sheet to an oxidizing treatment; and then carbonizing the infusibilized sheet at a temperature of at least 800 degrees C. in an inert gas atmosphere.

4619812

CARBON BLACK PRODUCTION APPARATUS

Lawrence Murray assigned to Phillips Petro- leum Company

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