Abstract: The present invention provides a wet friction member exhibiting excellent dynamic friction performance and a carbon fiber composite material for manufacturing the wet friction member. A carbon fiber composite material 10 of the present invention contains carbon fibers 11 and a matrix 12 joining the carbon fibers 11 with each other, and the matrix has fine pores having diameters of 3.5 nm to 100 nm. Since the fine pores having diameters of a nanometer (nm) order is formed in the matrix 12 of the carbon fiber composite material 10, the specific surface area of the carbon fiber composite material 10 is increased. As a result, a wet friction member made of the carbon fiber composite material 10 has an improved dynamic friction performance.

Abstract: A method for producing a silicon-carbide nanostructure, which includes steps of: irradiating a carbon-source supplied to a reaction chamber at a pressure of 1. Pa to 70 Pa with microwaves of 0.5 kW to 3 kW; generating plasma in a space above the silicon substrate at a temperature of 350° C. to 600° C.; and forming a silicon-carbide nanostructure having cone-shaped silicon-carbide aggregates which are scattered on and protruded from a surface of a silicon substrate. The silicon-carbide aggregates have a crystal structure of 2H ?-siC.

Abstract: A carbon fiber composite material (10) is provided which includes carbon fibers (11), a matrix (12) binding the carbon fibers (11) together, and pores (13), and a volume fraction of the carbon fibers (11) exclusive of the pores (13) is not less than 45% and up to 80%. The carbon fiber composite material (10) may preferably have a porous structure of which a porosity is not more than 20% and up to 70%. This carbon fiber composite material (10) has a high static friction coefficient (?S), and low ? ratio, and thus is suitable for a wet friction member (e.g., carbon disc 5) which is excellent in both of static friction performance and dynamic friction performance.

Abstract: A friction member for a frictional engagement device is provided in which weight is reduced, impact resistance is enhanced and sliding resistance is improved; and also provided is a method for producing the same. As a friction member (10) for a frictional engagement device, a friction member made of a carbon fiber/carbonaceous composite material is provided which is obtained by implementing a heat treatment on a precursor, the precursor comprising a matrix composed of a carbon binder and an additive and carbon fiber dispersed in the matrix, wherein a porosity of the friction member is 20-60%.

Abstract: The present invention provides a wet friction member exhibiting excellent dynamic friction performance and a carbon fiber composite material for manufacturing the wet friction member. A carbon fiber composite material 10 of the present invention contains carbon fibers 11 and a matrix 12 joining the carbon fibers 11 with each other, and the matrix has fine pores having diameters of 3.5 nm to 100 nm. Since the fine pores having diameters of a nanometer (nm) order is formed in the matrix 12 of the carbon fiber composite material 10, the specific surface area of the carbon fiber composite material 10 is increased. As a result, a wet friction member made of the carbon fiber composite material 10 has an improved dynamic friction performance.