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: Provided is a photoelectric conversion device for outputting an output voltage according to incident light, including photoelectric conversion unit for holding an optical charge generated by the incident light, a signal processing circuit impressed with a reference voltage for outputting the output voltage according to the incident light by applying a predetermined process to an output signal of the photoelectric conversion unit, and a switch provided between a terminal externally supplied with the reference voltage, and the signal processing circuit.

Abstract: Provided is a photoelectric conversion device for outputting an output voltage according to incident light, including photoelectric conversion unit for holding an optical charge generated by the incident light, a signal processing circuit impressed with a reference voltage for outputting the output voltage according to the incident light by applying a predetermined process to an output signal of the photoelectric conversion unit, and a switch provided between a terminal externally supplied with the reference voltage, and the signal processing circuit.

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: A carbon-carbon composite plate (1) for stamping is provided, the carbon-carbon composite plate having a porosity P of 20% or greater, and the stamping being carried out in the absence of water, or the carbon-carbon composite plate having a porosity P of 10% or greater, and the stamping being carried out in the presence of water. This enables an intact plate-shaped member to be obtained by stamping.

Abstract: A fiber-composite material includes: 55-75 wt % of carbon, 1-10 wt % of silicon and 10-50 wt % of silicon carbide, and the matrices including Si—SiC-based materials formed integrally among assemblages of yarns include carbon fibers integrally formed and combined three-dimensionally so as not to separate from each other. The fiber-composite material has a coefficient of kinetic friction of 0.05-0.6 and a porosity of 0.5-10%.

Abstract: A fiber-composite material includes: 55-75 wt % of carbon, 1-10 wt % of silicon and 10-50 wt % of silicon carbide, and the matrices comprising Si—SiC-based materials formed integrally among assemblages of yarns comprising carbon fibers integrally formed being combined three-dimensionally so as not to separate from each other. The fiber-composite material has a coefficient of kinetic friction of 0.05-0.6 and a porosity of 0.5-10%.

Abstract: A clutch disk made of a C/C composite for a wet multi-plate clutch is comprised of a disk body, and a pair of friction layers integral with and on opposite sides of the disk body for sliding contact with clutch plates. A relationship of V.sub.2 >V.sub.1 is established between the porosity V.sub.1 of the disk body and the porosity V.sub.2 of the friction layer, and the porosity V.sub.2 of the friction layer 4 is set in a range of 20%.ltoreq.V.sub.2 .ltoreq.60%, which provides a clutch disk with sufficient strength and excellent sliding characteristics.

Abstract: A spring member made of a carbon fibers/carbon composite material in which carbon fibers are dispersed in a matrix of graphite, The spring member has a spring constant in a range of 0.1 to 25 kg/mm and a density of about 1.5 to 3.0 g/cm.sup.3. For use in high temperature severe conditions a ceramic material is incorporated into the surface of the spring member.

Abstract: A spring member made of a carbon fibers/carbon composite material in which carbon fibers are dispersed in a matrix of graphite, and a process for producing such a spring member. The process includes the steps of: (a) forming raw preformed yarns; (b) shaping the raw preformed yarns in a form of a yarn member, a taper member or a sheet member; (c) coiling the thus shaped member around a core rod together with a coiling spacer; (d) molding the coiled member by hot pressing at about 300.degree. C.-2000.degree. C. under a given pressurized pressure; and graphitizing the coiled member at 1500.degree. C.-3000.degree. C., after carbonizing at 700.degree.-1200.degree.C. if necessary.

Abstract: A preformed yarn useful for forming composite articles is disclosed which includes a core of a multiplicity of fibers, fine powder provided in the interstices between the fibers, and a flexible sleeve formed of a thermoplastic resin and surrounding the core. The fine powder is formed of a material which neither melts nor reacts with the thermoplastic resin at a temperature up to 450.degree. C. and at a temperature up to the melting point of the thermoplastic resin. The incorporation of the fine powder between the fibers is effected by injecting fine powder-containing air from a jet nozzle and blowing the air against a bundle of the fibers.

Abstract: A flexible composite material comprising a core composed of a blend of a thermoplastic resin fiber and a reinforcing fiber, and a flexible sleeve formed of a thermoplastic resin and surrounding the core is prepared by intermixing a thermoplastic resin fiber and a reinforcing fiber to obtain a core, and then extruding a thermoplastic resin over the core.

Abstract: A flexible composite material comprising a core composed of a blend of a thermoplastic resin fiber and a reinforcing fiber, and a flexible sleeve formed of a thermoplastic resin and surrounding the core. The composite material may be prepared by intermixing a thermoplastic resin fiber and a reinforcing fiber to obtain a core, and then extruding a thermoplastic resin over the core.