Nippon Tungsten Co., Ltd.

Kouki Minamoto

Mitsuyoshi Nagano

Shigeya Sakaguchi

Toyoshige Sasaki

Norimitsu Mukae

A WC-based composite ceramics sintered body consisting of 40 volume % to 90 volume % of WC including solid-solved oxygen represented by a chemical formula of WC O (where 0.005<y/x&plus;y<0.05), with the remainder being partially stabilized ZrO and inevitable impurities, wherein partially stabilized ZrO includes one or more of stabilizers selected from the group consisting of Y O , CeO and MgO. A prepared powder of raw material is held in an atmosphere containing oxygen in a temperature range of 200&deg; C. to 600&deg; C. for 0.1 hour to 3 hours to provide WC grains including solid-solved oxygen represented by a chemical formula of WC O (where 0.005<y/x&plus;y<0.05). Partially stabilized Zro including one or more of stabilizers selected from the group consisting of Y O , CeO and MgO is used as a phase for filling up the grain boundary of the WC grains. A ceramic sintered body capable of sufficiently fulfilling various properties, such as of Young's modulus, hardness, heat conductivity and electrical workability, which are required as materials for sliding parts, edged tools and dies can be obtained.

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Fukuoka, Japan

Kouki Minamoto