发明名称 |
WIRE DRAWING DIE |
摘要 |
One object of the present invention is to provide a wire drawing die excellent in strength and wear resistance. The wire drawing die has a core formed using highly hard diamond polycrystalline body made substantially only of diamond and produced by directly converting a raw material composition including a non-diamond type carbon material into diamond and sintering the diamond at an ultra high pressure and an ultra high temperature without adding a sintering aid or a catalyst, the polycrystalline body having a mixed construction including fine-grained diamond crystals with a maximum grain size of less than or equal to 100 nm and an average grain size of less than or equal to 50 nm and plate-like or particulate coarse-grained diamond crystals with a minimum grain size of greater than or equal to 50 nm and a maximum grain size of less than or equal to 10000 nm. |
申请公布号 |
EP2647444(B1) |
申请公布日期 |
2017.03.29 |
申请号 |
EP20130157166 |
申请日期 |
2008.01.18 |
申请人 |
Sumitomo Electric Industries, Ltd.;A.L.M.T. Corp.;Sumitomo Electric Hardmetal Corp. |
发明人 |
Sumiya, Hitoshi;Yukawa, Makoto |
分类号 |
B21C3/02;B01J3/06;B82Y30/00;C04B35/52;C04B35/645 |
主分类号 |
B21C3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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