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2. 发明授权

US5852340A Low-voltage type igniter plug having a semiconductor for use in jet and other internal combustion engines and a method of making the semiconductor 失效
标题翻译：具有用于喷射和其它内燃机的半导体的低压型点火器插头和制造该半导体的方法
公开(公告)号：US5852340A
公开(公告)日：1998-12-22
申请号：US665874
申请日：1996-06-19
申请人： Yukihiko Ito , Eigo Goto
发明人： Yukihiko Ito , Eigo Goto
IPC分类号： H01T13/20 , C04B35/575 , H01T13/32 , H01T13/38 , H01T13/52 , H01T21/02 , H01T13/39
CPC分类号： C04B35/575 , H01T13/52
摘要： An igniter plug is disclosed for use in jet and other internal combustion engines. The igniter plug has a center electrode having a firing tip, which is mounted within an insulator which in turn is mounted within an exterior metal shell. A ground electrode is integral with or in electrical contact relationship with the metal shell and is disposed in a spaced, spark gap relation with the firing tip of the center electrode. An electrically semiconducting surface is disposed adjacent the spark gap and in electrical contact with the center electrode and with the ground electrode. The electrically semiconducting surface is formed by a sintered ceramic body having an actual density of more than 95 percent of its theoretical maximum density, and consists essentially of 67-80 wt % of silicon carbide particles and 20-33 percent by weight of grain boundary phase of alumina particles, as well as one or more sintering aids selected from magnesia, silica or calcia. Not only is the density of the sintered ceramic body high, it is uniform. This uniform density provides for uniform electrical characteristics and increased resistance to erosion due to electrical discharges between the electrodes. The high and uniform density of the sintered ceramic body is obtained by applying pressure to the ceramic body only after reaching the sintering temperature.
摘要翻译：公开了用于喷气式和其它内燃机的点火塞。点火塞具有具有点火尖端的中心电极，该中心电极安装在绝缘体内，绝缘体又安装在外部金属外壳内。接地电极与金属外壳成一体或与电接触的关系，并与中心电极的点火尖端间隔开，火花隙关系。电气半导体表面设置在火花隙附近并与中心电极和接地电极电接触。电半导体表面由实际密度超过其理论最大密度的95％的烧结陶瓷体形成，并且基本上由67-80重量％的碳化硅颗粒和20-33重量％的晶界相组成的氧化铝颗粒，以及一种或多种选自氧化镁，二氧化硅或氧化钙的烧结助剂。不仅烧结陶瓷体的密度高，均匀。这种均匀的密度提供了均匀的电气特性，并且由于电极之间的放电而增加了对侵蚀的抵抗力。通过在达到烧结温度后对陶瓷体施加压力来获得烧结陶瓷体的高且均匀的密度。

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