发明名称 |
Edged ceramic member, a punch for manufacturing a lead frame, a method of manufacturing lead frames and a method of manufacturing an edged ceramic member |
摘要 |
<p>A ceramic member is constituted with a zirconia-containing ceramic material containing 20% by volume or more of a zirconia series ceramic phase mainly composed of a zirconium oxide. The zirconia-containing ceramic material satisfies: <DF>KC/(d<A>)≥5 </DF> by using an exponential value A set within a range from -0.41 to -0.37 width, d being an average grain size (unit: mu m) and KC being a fracture toughness value (unit: MPa . m<1/2>). An edge portion appearing in the form of a ridge is formed at an intersection between two edge forming surfaces 4a and 5 to the outer surface of the member, and the edge portion is formed as a sharp edge portion E having a width w of 0.15 mm or less for the top end of the edge appearing on a cross section taken along an arbitrary plane in perpendicular to the direction of the ridge. <IMAGE></p> |
申请公布号 |
EP1057799(A2) |
申请公布日期 |
2000.12.06 |
申请号 |
EP20000300392 |
申请日期 |
2000.01.20 |
申请人 |
NGK SPARK PLUG COMPANY LIMITED |
发明人 |
SUZUKI, KEIJI |
分类号 |
B21D28/14;B21D28/00;B21D37/01;C04B35/48;C04B35/486;H01L21/48;(IPC1-7):C04B35/486 |
主分类号 |
B21D28/14 |
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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