Abstract:
PROBLEM TO BE SOLVED: To provide a thrust bearing of a turbocharger for an internal combustion engine excellent in seizure resistance by controlling the major axis direction of a needle Mn-Si based compound dispersed in the brass ground of a copper alloy.SOLUTION: The major axis direction of the needle Mn-Si based compound 4 dispersed in a region from the surface 2 of the sliding part 3 of the thrust bearing to a depth of 50 μm is subjected to process control at angles of 30° to 150° to the surface 2 of the sliding part 3, and hence the surface area of grains of the needle Mn-Si based compound 4 is mostly restricted in the brass ground. Thus, since the falling due to sliding is suppressed, seizure can be prevented without damaging the bearing surface 2 and the shaft surface during sliding.
Abstract:
PROBLEM TO BE SOLVED: To provide a sliding bearing excellent in anti-seizure property, which is used in a turbocharger of an internal combustion engine, and in which an inter-grain distance of an Mn-Si compound dispersed in a matrix of a copper alloy is controlled. SOLUTION: If the crystallized Mn-Si compound dispersed in the matrix of the copper alloy has an average inter-grain distance of 20-80 μm, a uniformly active state is achieved since the whole of the copper alloy matrix in the sliding surface of the sliding bearing is affected by a difference in a thermal expansion amount with the crystallized Mn-Si compound, and a non-metal sulfide film can be formed in an early stage on the surface of the copper alloy matrix. Therefore, sliding between a mating shaft surface and a metal surface can be prevented and the anti-seizure property of the sliding bearing can be improved. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve the characteristics of a copper alloy which is based on Cu-Zn-Sn and contains no lead, and to provide a method for using the copper alloy. SOLUTION: The copper alloy is mainly constituted by copper, zinc and tin while excluding toxic additives, and comprises 60-70% Cu, 0.5-3.5% Sn, and other matrix-activating elements, namely, 0.01-0.5% Fe and/or Co, 0.01-0.5% Ni, 0.01-0.5% Mn and/or Si, and the balance Zn with unavoidable impurities; and optionally further less than 3% Mg, less than 0.2% P, and less than 0.5% each of Ag, Al, As, Sb, Ti and Zr. Thereby, a requirement for compatibility with health and ecology is necessarily satisfied. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a copper-based sliding material which has excellent seize resistance by controlling a dispersed state of needle-shaped Mn-Si-based compounds crystallized in a brass structure.SOLUTION: In the copper-based sliding material 1 having the needle-shaped Mn-Si-based compounds 3 dispersed in the brass structure 2, 50% or more of the total number of the needle-shaped Mn-Si-based compounds 3 having a length in the long axis direction of 50 μm or more are composed of a plurality of small particles 4. Thereby, even if the needle-shaped Mn-Si-based compounds 3 fall off during sliding, the small particles 4 which constitute the needle-shaped Mn-Si-based compounds 3 may fall off. Thus, the frequency of falling off of the coarse needle-shaped Mn-Si-based compound 3, which damages a shaft and a bearing, is decreased. Therefore, seizure hardly occurs.
Abstract:
PROBLEM TO BE SOLVED: To provide a copper-zinc alloy having improved cold formability, high hardness and temperature stability. SOLUTION: The invention relates to a copper-zinc alloy, consisting of (in wt.%): from 28.0 to 36.0% Zn, from 0.5 to 2.3% Si, from 1.5 to 2.5% Mn, from 0.2 to 3.0% Ni, from 0.5 to 1.5% Al, from 0.1 to 1.0% Fe, optionally also up to at most 0.1% P, optionally also up to at most 0.2% Sn, optionally also up to at most 0.1% P, optionally also up to at most 0.08% S, remainder Cu and inevitable impurities, with mixed silicides of iron-nickel-manganese incorporated in the matrix. COPYRIGHT: (C)2009,JPO&INPIT