Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a sintered compact where a sintered compact having excellent characteristics (such as dimensional precision, mechanical properties and appearance) can be safely, easily and inexpensively produced, and to provide a sintered compact obtained by the method for producing a sintered compact, and having excellent characteristics. SOLUTION: The method for producing a sintered compact comprises: a molded body forming stage where a composition comprising inorganic material powders, and a binder including an aliphatic carbonic ester based resin and a second resin whose thermal decomposition temperature is higher than the melting point of the aliphatic carbonic ester based resin is molded, so as to obtain a molded body; a first degreasing stage where the molded body is exposed to an alkaline gas-containing atmosphere, thus the aliphatic carbonic ester based resin is decomposed away from the molded body, so as to obtain a first degreased body; an intermediate stage where the first degreased body is exposed to a low alkaline gas-containing atmosphere whose alkaline gas concentration is lower than that in the alkaline gas-containing atmosphere, so as to obtain an intermediate degreased body; a second degreasing stage where the intermediate degreased body is heated, so as to obtain a second degreased body; and a sintering stage where the second degreased body is sintered, so as to obtain a sintered compact. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide metallic particles which have a nanometric average diameter, have sufficient electroconductivity, have high stability, and can be suitably used for a catalyst material, an electroconductive paste and an ink material. SOLUTION: The method for producing the metallic nanoparticles includes reacting a solution containing a metal salt of an organic acid and an amine with a reducing agent. The colloid of the particle is prepared by dispersing the obtained particles in an organic solvent. The paste and powder of the particle are also prepared by using the particles obtained through the method. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a friction material which is free from the problems that a friction coefficient is low at a slow speed and susceptible to moisture, which is a drawback of a C/C composite, and with which a stable performance is obtainable from the friction against even a cast-iron rotor used in general on-road traffics besides a C/C composite rotor or a ceramic-based composite rotor, and is inexpensive. SOLUTION: The friction material whose binding material is prepared by calcining to carbonize an organic material is characterized in that the compressive deformation at room temperature when at 4 MPa load is 0.3-2.5% and when at 10 MPa load is 1.0-4.5%, that the compressive deformation ratio of the compressive deformation at room temperature to that at 300°C is in the range of 1.0-1.5 when in 4-10 MPa load range and that the calcining carbonization is conducted by carbonizing the organic material in the atmosphere of a vacuum, a reductive gas or an inert gas at a temperature of 550-1,300°C. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
A self-lubricating composite material excellent in strength and high-temperature oxidation resistance and usable in the air and in vacuo. It is a composite Cu-Ni-Sn sinter containing 20-70 vol. % of a mixture of graphite particles and WS2 particles as the solid lubricant component and having a porosity of 25 vol. % or less. It has a structure wherein the solid lubricant particles are surrounded by a matrix comprising a two-phase alloy composed of Cu-Ni alloy particles and a single Sn phase or an intermetallic Sn-Ni compound dispersed uniformly in the grain boundary of the alloy particles to bond the particles to each other firmly. The matrix has an alloy composition comprising 5-40 wt. % of Ni, 4-15 wt. % of Cu and the balance consisting of Cu and unavoidable impurities.