Compositions: ceramic – Ceramic compositions – Refractory
Patent
1994-03-17
1996-06-11
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 95, 264 60, 264136, 264DIG19, 428364, 428368, 428408, 428688, C04B 3552
Patent
active
055255582
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a 371 of international application number PCT/JP 93/00812, filed Jun. 16, 1993.
TECHNICAL FIELD
The present invention relates to a process for producing a carbon fiber reinforced carbon composite material (hereinafter referred to as "a C/C composite material"), and a C/C composite material, and a sliding material. According to the producing process of the present invention, frictional characteristic and mechanical characteristic of the C/C composite material can be easily controlled. The C/C composite material of the present invention is excellent, for example, in friction characteristic and mechanical characteristic and it is suitable to a sliding material.
BACKGROUND ART
Generally, C/C composite materials are produced by impregnating or mixing long or short carbon fibers such as polyacrylonitrile (PAN) type, pitch type and rayon type with a thermosetting resin such as a phenol resin and a furan resin or a thermoplastic resin such as pitches, followed by heating and then baking them in a non-oxidative atmosphere at a temperature of from 600.degree. to 2500.degree. C.
Various kinds of methods, however, have been known for producing C/C composite materials in which short fibers are used. For instance, a method comprising mixing a solvent and carbon fibers in a mixer, forming into a mat by a screen and then applying a pressure to produce a porous carbon electrode (Japanese Patent Application Laid-Open (KOKAI) Nos. 54-41295(1979) and 57-129814(1982)); a method comprising mixing a solvent and carbon fibers of different length in a molding by ultrasonic vibrations (Japanese Patent Application Laid-Open (KOKAI) No. 58-30537(1983)); a method comprising laminating short fibers into a mat and then impregnating with a resin or pitch and molding (Japanese Patent Application Laid-Open (KOKAI) No. 62-119288(1987)); a method comprising applying beating in a solvent, thereby homogeneously dispersing short fibrous carbon fibers, and then removing the solvent to obtain a carbon fiber mass oriented at random (Japanese Patent Application Laid-Open (KOKAI) No. 62-96364(1987)); and a method comprising supplying a mixture of short fibers and a solvent to a molding having a plurality of solvent drawing ports at the bottom and then drawing out the solvent to form a pre-form (Japanese Patent Application Laid-Open (KOKAI) No. 1-176173(1989)) may be mentioned.
The C/C composite materials produced by the methods described above have been used in recent years as sliding materials of brakes for use in aircrafts or cars or clutches for use in cars, instead of existent metal disc rotors. This is because the C/C composite material is excellent, as compared with the metal disc rotor, in characteristics such as reduced weight and heat resistance.
For using the C/C composite material as the sliding material, it is necessary to control the frictional characteristic or the mechanical strength thereof to appropriate values.
As a method for controlling the frictional characteristic of the C/C composite material, the following methods are known for instance. Namely, a method for controlling the frictional characteristic of the C/C composite material by impregnating with coal tar, pitch, furan resin or the like (Japanese Patent Publication (KOKOKU) No. 60-54270(1985)), a method comprising orienting relatively long fibers (4 to 6 cm) and short fibers (0.015 to 0.3 cm) at random (Japanese Patent Publication (KOKOKU) No. 1-59459(1989)) and a method comprising cutting a carbon fiber reinforced thermosetting resin composite material in which carbon fibers are oriented so as to transverse a plane perpendicular to an axis of a cylinder along a direction in perpendicular to the axis of the cylinder, baking and densifying it to orient the carbon fibers such that they have a certain angle relative to a sliding surface (Japanese Patent Publication (KOKOKU) No. 3-78498(1991)) may be mentioned.
As a method for controlling the mechanical strength of the C/C composite material, the following metho
REFERENCES:
patent: 4339021 (1982-07-01), Kosuda et al.
patent: 5202293 (1993-04-01), Okamoto et al.
patent: 5205888 (1993-09-01), Mochida et al.
patent: 5243746 (1993-09-01), Shinichi
Derwent WPI EP O 459 916 A1 WPI Acc No: 91-356144/49 Multilayer friction element etc. Bommier et al. Jun. 1991.
Database WPI Section Ch, Week 8727, Derwent, Class LO2, AN 87-189308, JP-A-62 119 288 May 30, 1987.
Database WPI Section CH, Week 8841, Derwent Class A81, AN 88-288680 & JP-A-63 210 065 Toray Aug. 31, 1988.
Fukagawa Toshihiro
Kawamata Yutaka
Matsui Takeo
Niwa Kazuo
Oonishi Nobuyuki
Group Karl
Marcheschi Michael
Mitsubishi Chemical Corporation
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