发明名称 |
SPARK PLUG AND PROCESS FOR PRODUCING SPARK PLUG |
摘要 |
<p>Provided is a spark plug which has high withstand voltage characteristics at high temperatures and is less apt to decrease in withstand voltage characteristics at high temperatures. The spark plug is equipped with a center electrode, an insulator, and a metal shell, and is characterized in that the insulator comprises an alumina-based sintered object containing a silicon component, a Group-2- element component, and a rare-earth element component, that the alumina-based sintered object comprises a glass phase and an alumina crystal phase, the two phases being determined by X-ray diffractometry, and that when a grain boundary phase of the alumina-based sintered object is examined with a transition electron microscope and the weight ratio of an alkali metal component to the rare-earth element component in terms of oxide amount [alkali metal/rare-earth element] in each of 30 circular spots having a diameter of 0.3 nm is calculated, then the average of the values thereof is 0.01-1.0.</p> |
申请公布号 |
WO2011001656(A1) |
申请公布日期 |
2011.01.06 |
申请号 |
WO2010JP04263 |
申请日期 |
2010.06.28 |
申请人 |
NGK SPARK PLUG CO.,LTD.;TAKAOKA, KATSUYA;UEGAKI, HIRONORI;KURONO, HIROKAZU;HONDA, TOSHITAKA |
发明人 |
TAKAOKA, KATSUYA;UEGAKI, HIRONORI;KURONO, HIROKAZU;HONDA, TOSHITAKA |
分类号 |
H01T13/38;C04B35/111;C04B35/64;H01T21/02 |
主分类号 |
H01T13/38 |
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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