发明名称 |
SPARK PLUG AND PROCESS FOR PRODUCING THE SPARK PLUG |
摘要 |
This invention has an object to provide a spark plug exhibiting high withstand voltage characteristics and high strength at high temperature, formed by an alumina-based sintered body prepared with excellent processability and high productivity, and a method for manufacturing the spark plug. This invention relates to a spark plug 1 including an insulator 3, wherein the insulator 3 includes a dense alumina-based sintered body having an average crystal particle diameter of 1.50 µm or more, and the alumina-based sintered body contains Si, a Group 2 element component containing Ba and a Group 2 element other than those, and a rare earth element component, such that a ratio of a content S of the Si component to a total content of the content S and a content A of the Group 2 element component is 0.60 or more, and a method for manufacturing the spark plug 1 prepared through a grinding-shaping process in which the insulator 3 is ground before burning to shape the same. |
申请公布号 |
EP2259394(A4) |
申请公布日期 |
2016.11.30 |
申请号 |
EP20090723991 |
申请日期 |
2009.03.26 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
KURONO, HIROKAZU;HONDA, TOSHITAKA;TAKEUCHI, HIROKI;MITSUOKA, TAKESHI;TANAKA, KUNIHARU;MIYATA, KAZUNARI;TAKAOKA, KATSUYA |
分类号 |
H01T13/38;C04B35/111;H01T13/20;H01T13/36 |
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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