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ALUMINA-BASED SINTERED COMPACT AND SPARK PLUG
PROBLEM TO BE SOLVED: To provide an alumina-based sintered compact having high voltage resistance and a spark plug using the same.SOLUTION: There is provided a spark plug which comprises: an alumina-based sintered compact 1 having a main phase 2 composed of alumina crystals and crystal phases 3 dispersed in the main phase; and an insulator composed of the alumina-based sintered compact 1. The crystal phases 3 are composed of at least one compound selected from the group consisting of MgAlO, 2MgO 2AlO5SiO, 2MgO SiOand MgO SiO. In the cross section of the alumina-based sintered compact 1, the average particle diameter of the crystal phases 3 in an arbitrary region of 100 μm×100 μm is 0.4 to 5.3 μm and the number of crystal phases 3 having a crystal diameter of 1 to 5 μm in the region is 8 to 412 pieces.SELECTED DRAWING: Figure 1
【課題】耐電圧の高いアルミナ質焼結体及びこれを用いたスパークプラグの提供。【解決手段】アルミナ結晶からなる主相２と、これに分散された結晶相３とを有するアルミナ質焼結体１、及びアルミナ質焼結体１からなる絶縁碍子を備えるスパークプラグ。結晶相３は、ＭｇＡｌ2Ｏ4、２ＭｇＯ・２Ａｌ2Ｏ3・５ＳｉＯ2、２ＭｇＯ・ＳｉＯ2、及びＭｇＯ・ＳｉＯ2からなるグループから選ばれる少なくとも１種の化合物からなり、アルミナ質焼結体１の断面において、任意の１００μｍ?１００μｍの領域内における結晶相３の平均粒子径が０．４〜５．３μｍであり、領域内における粒径１〜５μｍの結晶相３の数が８〜４１２個であるアルミナ焼結体１からなる絶縁碍子を有するスパークプラグ。【選択図】図１
ALUMINA-BASED SINTERED COMPACT AND SPARK PLUG
PROBLEM TO BE SOLVED: To provide an alumina-based sintered compact having high voltage resistance and a spark plug using the same.SOLUTION: There is provided a spark plug which comprises: an alumina-based sintered compact 1 having a main phase 2 composed of alumina crystals and crystal phases 3 dispersed in the main phase; and an insulator composed of the alumina-based sintered compact 1. The crystal phases 3 are composed of at least one compound selected from the group consisting of MgAlO, 2MgO 2AlO5SiO, 2MgO SiOand MgO SiO. In the cross section of the alumina-based sintered compact 1, the average particle diameter of the crystal phases 3 in an arbitrary region of 100 μm×100 μm is 0.4 to 5.3 μm and the number of crystal phases 3 having a crystal diameter of 1 to 5 μm in the region is 8 to 412 pieces.SELECTED DRAWING: Figure 1
【課題】耐電圧の高いアルミナ質焼結体及びこれを用いたスパークプラグの提供。【解決手段】アルミナ結晶からなる主相２と、これに分散された結晶相３とを有するアルミナ質焼結体１、及びアルミナ質焼結体１からなる絶縁碍子を備えるスパークプラグ。結晶相３は、ＭｇＡｌ2Ｏ4、２ＭｇＯ・２Ａｌ2Ｏ3・５ＳｉＯ2、２ＭｇＯ・ＳｉＯ2、及びＭｇＯ・ＳｉＯ2からなるグループから選ばれる少なくとも１種の化合物からなり、アルミナ質焼結体１の断面において、任意の１００μｍ?１００μｍの領域内における結晶相３の平均粒子径が０．４〜５．３μｍであり、領域内における粒径１〜５μｍの結晶相３の数が８〜４１２個であるアルミナ焼結体１からなる絶縁碍子を有するスパークプラグ。【選択図】図１
ALUMINA-BASED SINTERED COMPACT AND SPARK PLUG
アルミナ質焼結体、及びスパークプラグ
IMADA SHOTA (author)
2016-02-08
Patent
Electronic Resource
Japanese
COMPACT PRODUCTION METHOD, INSULATOR FOR SPARK PLUG, AND SPARK PLUG
| European Patent Office | 2016