| 摘要 |
PROBLEM TO BE SOLVED: To provide super hard semiconductive polycrystal diamond (PCD) material improving cutting property in electrical discharge machining (EDM) and electrical discharge grinding (EDG). SOLUTION: Super hard semiconductive PCD material formed of semiconductive diamond particles having Li, Be and Al doped and/or insulating diamond particles having semiconductive surfaces is provided and a tool taking the material therein and a method for manufacturing the material are provided. The super hard PCD material can be manufactured by sintering a plurality of diamond crystals to transform to contain semiconductive surfaces with using insulating diamond particle raw material layer containing additives. Or, the super hard PCD material can be manufactured by sintering semiconductive diamond particle raw material composed of diamond crystal having Li, Al or Be doped. COPYRIGHT: (C)2004,JPO
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