Abstract: There are provided a carbon fiber composite material having higher strength than conventional carbon fiber composite materials, and a brake member, a structural member for semiconductor, a heat resistant panel and a heat sink, all of which use this carbon fiber composite material. The carbon fiber composite material is obtained by mixing carbon fiber with a resin, subsequently molding the mixture and carbonizing the molded product, and subjecting the resultant carbonized product to melt impregnation with silicon, in which the lattice spacing d002 of the carbon (002) plane of the carbon fiber as measured by an X-ray diffraction method is 3.36 to 3.43. A brake member, a structural member for semiconductor, a heat resistant panel and a heat sink, all of which use this carbon fiber composite material, are provided. The carbon fiber is preferably a carbon fiber obtained by calcining a pitch-derived precursor.

Abstract: It is an object of the invention to provide a ceramic sintered body that has a dense structure and minimal cracking and that exhibits excellent sliding properties even in a non-lubricated state, as well as a process for its production and sliding parts that employ the same. According to a preferred mode, the sintered body of the invention comprises silicon carbide as the parent material and further contains a solid lubricant A with a mean particle size of no greater than 5 ?m and a solid lubricant B with a mean particle size of 10-70 ?m.

Abstract: There are provided a carbon fiber composite material having excellent mechanical properties such as toughness and strength, and a brake member, a structural member for semiconductor, a heat resistant panel and a heat sink, all of which use this carbon fiber composite material. The carbon fiber composite material is obtained by mixing carbon fiber with a resin, subsequently molding the mixture and carbonizing the molded product, and subjecting the resultant carbonized product to melt impregnation with silicon, in which the lattice spacing d002 of the carbon (002) plane of the carbon fiber as measured by an X-ray diffraction method is 3.46 to 3.51. A brake member, a structural member for semiconductor, a heat resistant panel and a heat sink, all of which use this carbon fiber composite material, are provided.

Abstract: It is an object of the invention to provide a ceramic sintered body that has a dense structure and minimal cracking and that exhibits excellent sliding properties even in a non-lubricated state, as well as a process for its production and sliding parts that employ the same. According to a preferred mode, the sintered body of the invention comprises silicon carbide as the parent material and further contains a solid lubricant A with a mean particle size of no greater than 5 ?m and a solid lubricant B with a mean particle size of 10-70 ?m.