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公开(公告)号：US20190214794A1
公开(公告)日：2019-07-11
申请号：US15863427
申请日：2018-01-05
Applicant: FRAM GROUP IP LLC
Inventor： Jing ZHENG , Ronald P. Rohrbach , Peter D. UNGER , Jeffrey T. BOEHLER
Abstract: A spark plug includes an insulative sleeve. A glaze coating is disposed on an exterior surface of the insulative sleeve. The glaze coating includes a boric acid, a borosilicate glass, a barium borate glass, a phosphorous glass, a silicate glass, or a combination thereof. The glasses are independently modified with a modifier selected from the group consisting of alkali group metals, alkali earth group metals, aluminum, silicon, a halogen, or a combination thereof. The glaze coating has a softening point between about 650° C. and about 1100° C.
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