Honda Motor Co., Ltd.

Sanyo Special Steel Co., Ltd.

Hondo Motor Co., Ltd.

Shogo Matsuki

Yositaka Tsujii

Toshiyuki Sawada

Akihiko Yanagitani

Shingo Fukumoto

Tomoki Okita

Yoshitaka Tsujii

Nobuki Matsuo

Takashi Tsuyumu

Makoto Asami

Toshiyuki Sanyo Special Steel Co Ltd Sawada

Hard phase particles including Co alloy particles, carbide alloy particles, and silicide particles are dispersed substantially uniformly throughout a matrix composed of Cu self-fluxing alloy of a cladded portion. The cladded portion contains 6 to 15% by weight of Co, 3 to 8% by weight of one of Cr and Mo, 0.3 to 1% by weight of W, 0.5 to 1.8% by weight of Fe, 8 to 15% by weight of Ni, 0.08 to 0.2% by weight of C, 1.5 to 4% by weight of Si, 0.5 to 0.8% by weight of Al, and 0.1 to 0.3% by weight of P, and inevitable impurities and Cu as a balance. The hard phase particles have an average particle diameter of 8 to 20 &#x3bc;m and a particle size distribution width of 0.1 to 100 &#x3bc;m, and to occupy 10 to 20% in an arbitrary cross section of the cladded portion.

Particle dispersion copper alloy and method for producing the same

There are disclosed a laser clad valve seat raw-material powder superior in productivity, cladding property, wear resistance and finishing property, and a laser clad valve seat using the same superior in wear resistance. The row-material powder comprises a powder mixture comprising: 80 to 99% by weight of a Cu-based alloy powder comprising 0.5 to 5% by weight of B, 0 to 20% by weight of Ni, 0 to 10% by weight of Fe plus Co, 0 to 5% by weight of Si, 0 to 3% by weight of Al, and the balance Cu and unavoidable impurities; and 1-20% by weight of an Fe or Co based alloy powder having a Vickers hardness of 500 HV or higher and an average particle diameter of 50 to 200 &#x3bc;m of and comprising 5 to 40% by weight of Mo, 0 to 25% by weight of Cr, 0 to 5% by weight of Si, and the balance Fe or Co and unavoidable impurities.

Raw material powder for laser clad valve seat and valve seat using the same

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Utsunomiya, Japan

Shogo Matsuki