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Insulator for spark plug and spark plug
An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40≰Y/X≰2.00 0.10≰Z/X≰0.40.
Insulator for spark plug and spark plug
An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40≰Y/X≰2.00 0.10≰Z/X≰0.40.
Insulator for spark plug and spark plug
TAKAOKA KATSUYA (author) / YOKOYAMA YUTAKA (author) / FUJIMURA KENGO (author) / UEGAKI HIRONORI (author) / TAKEUCHI HIROKI (author) / KURONO HIROKAZU (author) / HONDA TOSHITAKA (author) / TANAKA KUNIHARU (author) / MITSUOKA TAKESHI (author)
2015-10-13
Patent
Electronic Resource
English
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