Osaka Gas Company Limited

Toyota Jidosha Kabushiki Kaisha

Unitika Ltd.

Sharp Corporation

Yoshiteru Nakagawa

Hirohisa Miura

Hirohumi Michioka

Shoichi Tsuchiya

Mamoru Okamoto

Satoru Nakatani

Kazuo Yamada

Takehito Mitate

Naoto Nishimura

Yoshio Fuwa

Tetsuya Yoneda

Keiichi Asami

Yoshiaki Iwaya

Norio Murakami

Hiroyuki Tajiri

Makihiko Mori

Toyohiro Maeda

Yoshio Huwa

Katsuyuki Touma

Hiroaki Matsuyoshi

Masatoshi Kubota

Yasuo Minamitani

Yasunori Goda

Hideki Tamamura

Takayuki Azuma

Katsumi Fujita

Noboru Mimura

Tadashi Murakami

Shinji Okumura

Yoshiharu Tanaka

Kazuaki Minato

Masamitsu Katsuura

Koichi Morita

Hiromi Fujiwara

Yoshihiro Tsukuda

A slurry containing a precursor fiber convertible to carbon fiber and/or a carbon fiber and, based on 100 parts by weight of the fiber, 10 to 300 parts by weight of a thermosetting resin, e.g. phenol resin, is processed into a random web. This web may contain a pitch or an organic granular material. The web is hot-pressed between a pair of belts while curing of the resin is inhibited to prepare a prepreg sheet. This sheet is disposed, leaving a clearance, in a mold having ribs on a molding surface and heated over the melting point of the resin for expansion and complete cure to provide a porous composite sheet equipped with grooves. This porous composite sheet is carbonized or graphitized to produce a porous carbonaceous material for use as a fuel cell electrode material and so on. This porous carbonaceous material has high homogeneity, gas permeability, electrical conductivity, heat conductivity and mechanical strength.

Porous carbonaceous material and a method for producing the same

Method of producing mesocarbon microbeads and method for quality control

A carbon fiber reinforced carbon of the present invention is composed of a sintered body comprising precursor carbonaceous fiber and self-sintering carbonaceous powder with the precursor carbonaceous fiber buried therein. Since the precursor carbonaceous fiber working as a reinforcement and the self-sintering carbonaceous powder working as a binder come to have substantially the same physical properties (strength, shrinkage rate and the like), the boudary adhesion between them improves, thereby giving the sintered body high strength and excellent abrasion resistance. When the precursor carbonaceous fiber is subjected to a surface treatment using a viscous material, the wettability of the surface of the precursor carbonaceous fiber increases, thereby further improving the boundary adhesion between the precursor carbonaceous fiber and the self-sintering precursor carbonaceous powder.

Carbon fiber reinforced carbon

Disclosed is a sliding member having a predetermined shape and including: a sintered body obtained by sintering a composite body including: preliminary carbonized carbonaceous fiber; inorganic powder or inorganic fiber; and self-sintering carbonaceous powder with the preliminarily carbonized carbonaceous fiber and the inorganic powder or the inorganic fiber buried therein. The sliding member has a high and stable friction coefficient (.mu.), high strength, excellent abrasion resistance, and is manufacturable at a low cost. Further, the friction coefficient (.mu.) and the other properties of the sliding member can be controlled depending on an application of a sliding member by selecting an optimum inorganic powder or inorganic fiber. Particularly, when boron compound powder is selected as the inorganic powder, the friction coefficient (.mu.) of the sliding member can be suppressed to 0.15 or less, and the load at seizure thereof can be improved to 100 kgf/cm.sup.2 or more.

Sliding member

Pitch substantially free from primary and secondary QI components and solids comprising secondary QI components are prepared by centrifuging coal tar or coal tar pitch at a high temperature, heat-treating the separated supernatant liquid and centrifuging again the liquid at a high temperature.

Process for treating coal tar or coal tar pitch

Growing community of inventors

Yamatokoriyama, Japan

Yoshiteru Nakagawa