Hitachi Chemical Company, Ltd.

Nissan Motor Company Limited

Resonac Corporation

Japan Brake Industrial Co., Ltd.

Showa Denko Materials Co., Ltd.

Teruyuki Nagayoshi

Manabu Ono

Kazuya Baba

Mitsuhiro Inoue

Takahiro Mibe

Noboru Suzuki

Hiroki Morozumi

Takenori Abe

Yukio Takai

Yuichi Fukuzawa

There are provided a friction material composition containing no copper or having a reduced content of copper that can provide a friction material in which the stability of the friction coefficient after standing in a cold environment, the abrasion resistance, and the low rust fixation properties are excellent, and squeal (particularly low temperature squeal) is suppressed, and a friction material obtained by molding the friction material composition, and a friction member using the friction material. The friction material composition is specifically a friction material composition comprising a bonding material, an organic filler, an inorganic filler, and a fiber substrate, in which the friction material composition comprises no copper, or has a content of copper of less than 0.5% by mass in terms of a copper element even if comprising the copper, and comprises, as the organic filler, cashew particles to which a silicone resin adheres.

Friction material composition, friction material, and friction member

Provided is a friction material composition including: a binder; an organic filler; an inorganic filler; and a fiber substrate, in which a content of copper as an element is 0.5% by mass or less, the friction material composition contains at least one of phlogopite or biotite in a total of from 3% by mass to 9% by mass, and a graphite in an amount of from 2% by mass to 6% by mass, as the inorganic fillers, the at least one of phlogopite or biotite has an average particle size of from 340 &#x3bc;m to 1,500 &#x3bc;m, and the graphite has an average particle size of from 450 &#x3bc;m to 1,100 &#x3bc;m.

The present invention is to provide a friction material composition comprising a fibrous material except for asbestos, an inorganic friction regulating agent, an organic friction regulating agent and a binder, wherein active alumina is contained as the inorganic friction regulating agent, and a fluorine series polymer is contained as the organic friction regulating agent, and to provide a friction material using the friction material composition.

Friction material composition and friction material therefrom

There are disclosed a friction material composition which comprises a fibrous material except for asbestos, an inorganic friction regulator, an organic friction regulator and a binder, part of the inorganic friction regulator is &#x3b1; alumina and &#x3b3; alumina in combination, a weight ratio of the &#x3b1; alumina and the &#x3b3; alumina, &#x3b1; alumina:&#x3b3; alumina, is in the range of 1:20 to 1:5, and part or whole part of the binder is a silicon-containing phenol resin, and a friction material obtained by molding the friction material composition under heating and pressure.

Friction material composition and friction material using the same

A friction material composition containing a fibrous material, a binder and a friction adjusting agent, wherein the friction adjusting agent is secondary aggregates of an activated alumina being spherical and having a diameter of 10 to 300 &#x3bc;m, or an activated alumina having a specific surface area of 100 to 400 m/g and an average particle diameter of 1 to 200 &#x3bc;m. The composition can be used for producing a friction material which exhibits significant improvement with respect to fading phenomenon, without adversely affecting its characteristics of attacking to a disc rotor, which is the article mating therewith, and without marked reduction of the friction coefficient at an elevated temperature, and is capable of controlling the thickness of the sliding film formed on a frictionally sliding face and preventing a high frequency noise (grabbing chatter).

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Hitachi, Japan

Teruyuki Nagayoshi