Other

Nissan Motor Company Limited

Mitsui Minings & Melting Co., Ltd.

Takeshi Ojiro

Makoto Kano

Hidenobu Matsuyama

Ryuji Ninomiya

Kenji Suzuki

Kenji Tsushima

Koichi Miyake

A valve seat ( ) is formed by build-up cladding by irradiating a laser beam on a copper alloy powder ( ) provided in the rim of a port ( ) formed in an engine cylinder head ( ). The copper alloy powder ( ) consists of copper (Cu), 6-9 wt % nickel (Ni), 1-5 wt % silicon (Si), and 1-5 wt % of one of molybdenum (Mo), tungsten (W), tantalum (Ta), niobium (Nb) and vanadium (V). Due to this composition, the valve seat ( ) has few microcracks and excellent abrasion resistance.

Abrasion resistant copper alloy, copper alloy powder for build-up cladding, and engine cylinder head

An abrasion resistant copper alloy suitable for the material of an overlaid layer formed at the valve seat of an engine cylinder head formed of aluminum alloy. The copper alloy consists essentially of nickel in an amount ranging from 10 to 30% by weight; silicon in an amount ranging from 0.5 to 5.0% by weight; at least one element selected from the group consisting of molybdenum, tungsten, tantalum, niobium and vanadium, in an amount ranging from 2.0 to 15.0% by weight; and balance being copper and impurities.

Abrasion resistant copper alloy

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Ageo, Japan

Takeshi Ojiro