Daido Metal Company Ltd.

Other

Satoru Kurimoto

Takayuki Shibayama

Koichi Yamamoto

Kenji Sakai

Naohisa Kawakami

Takashi Inaba

Kazuaki Toda

Eisaku Inoue

Ryo Sato

In a copper-based slide member in which needle-shaped Mn&#x2014;Si based compounds are dispersed in a brass structure, 50% or more of a total number of the needle-shaped Mn&#x2014;Si based compounds having lengths of 50 &#x3bc;m or more in a major axis direction are constituted of a plurality of small particles. Thereby, even if the needle-shaped Mn&#x2014;Si based compounds fall off during sliding, the small particles which constitute the needle-shaped Mn&#x2014;Si based compounds may fall off. Thus, the frequency of falling off of the coarse needle-shaped Mn&#x2014;Si based compound which damages a shaft and a bearing is decreased. Therefore, seizure hardly occurs.

Copper-based slide member

A thrust bearing for a turbocharger of an internal-combustion engine is made of a copper alloy including a brass matrix and a needle-like Mn&#x2014;Si-based compound dispersed in the brass matrix. Not less than 50% of the needle-like Mn&#x2014;Si-based compound dispersed in a region from a surface of a sliding portion of the thrust bearing to a depth of 50 &#x3bc;m have a major axis extending from the inside of the sliding portion to the surface. The major axis makes an angle of 30&#xb0; to 150&#xb0; with the surface of the sliding portion when observed in a sectional view perpendicular to the surface of the sliding portion.

Thrust bearing for turbocharger of internal-combustion engine

A copper-based sliding material comprising sintered copper or sintered copper alloy, and 0.1 to 5 vol. % hard substance particles harder in hardness than said copper or copper alloy, said hard substance particles being substantially evenly dispersed so that, when at least one, randomly selected surface portion or sectional portion of said sintered copper or sintered copper alloy is partitioned into squares each having a side of 20 &#x3bc;m, at least one particle exists in each of squares not less than 80% of the whole squares. The copper-based sliding material has good anti-seizure property and superior resistance to fatigue without containing any lead.

Sliding material made of copper alloy, method of producing same, sliding bearing material, and method of producing same

A copper-based sliding material produced by sintering, comprising at least two phases of copper and/or copper alloys which phases have hardness levels different form each other, and hard particles with an average particle size of 0.1 to 10 &mgr;m which are dispersed in at least one phase with the exception of a softest phase in an amount of 0.1 to 10 vol. % of the whole copper-based sliding material, said sliding material satisfying (H2/H1)&gE;1.2 in which H1 is the Vickers hardness of the softest phase and in which H2 is the Vickers hardness of a phase hardest in hardness including said hard particles.

Copper-based sliding material, method of manufacturing the same, and sliding bearing

Disclosed is a copper alloy sliding material having a metal structure wherein intermetallic compounds exist adjacently to Pb-phase islands and/or Bi-phase islands. Because intermetallic compounds exist between the matrix and the Pb phase and/or the Bi phase, the material can have improved anti-seizure property, since, under load or due to wear, the surface of the material has recessions at the soft Pb and/or Bi phase and the matrix with respect to the intermetallic compounds.

Copper alloy sliding material

Disclosed is a composite sliding material having a steel plate and a sintered copper alloy layer which is bonded to the steel plate. The copper alloy contains, 1.5 to 15 mass % Sn, 1.5 to 15 mass % Bi, 1.5 to 20 volume % of a solid lubricant, and balance of Cu and incidental impurities. The volume ratio of Bi to the solid lubricant is in a range of 0.5 to 2.0. Bi and the solid lubricant improves the copper alloy in sintering property, since Bi melts when sintering because of a low melting point resulting in improved sintering property, and the solid lubricant ensures good anti-seizure property, and deterioration of mechanical strength is prevented by virtue of a phenomenon that the solid lubricant is entrained in Bi.

Composite sliding material

A copper alloy sliding material which can bring about superior resistance to fatigue as well as good anti-seizure property without containing any Pb. The copper alloy sliding material is made to have the structure in which both of the hard copper alloy phase and the soft copper alloy phase coexist in a mixture state. On the surface of the sliding material, the soft copper alloy phase comes to have a shape more concave than that of the hard copper alloy phase when receiving a load or when being in a sliding wear relation, in which concave portions is retained lubricant with the result that the anti-seizure property is enhanced. Further, since the soft phase and the hard phase are made of the same copper alloy, the wettability thereof becomes good, and Ni and etc. contained in the hard copper alloy phase are diffused into the soft copper alloy phase, so that the hardness of the boundary portion defined between the phases come to be gradually varied. Thus, because of the unclear boundary, the load received in the hard phase comes to be spread in a wide range without being concentrated at the boundary, so that the fatigue strength is enhanced.

Sliding material made of copper alloy, method of producing same, and sliding bearing

Disclosed is a copper alloy sliding material comprising 0.5 to 15 mass % Sn and 0.1 to 10 vol % of hard particles consisting of one or more selected from WC, W C and Mo C. The hard particles have preferably an average particle size of 0.1 to 10 &mgr;m, whereby they are dispersed in the copper alloy matrix so as to make the sliding-contact surface uneven, from which the hard particles protrude partially. The sliding material comprises an amount or a total amount of not more than 40 mass % of one or more selected from Ni, Ag, Fe, Al, Zn, Mn, Co, Si and P, an amount or a total amount of not more than 10 mass % of Bi and/or Pb, and/or an amount or a total amount of not more than 10 vol % of a solid lubricant comprising BN, graphite, MoS and/or WS .

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Nagoya, Japan

Satoru Kurimoto