Is a
Patent attributes
Patent Applicant
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shun Kondo0
Yutaka Yokoyama0
Haruki Yoshida0
Kuniharu Tanaka0
Michitaka Yamada0
Yusuke Nomura0
Date of Patent
March 10, 2020
0Patent Application Number
160159670
Date Filed
June 22, 2018
0Patent Citations
Patent Citations Received
Patent Primary Examiner
Patent abstract
The spark plug includes an insulator made from an alumina-based sintered body, and the insulator contains 90 to 98 wt % of an Al component in oxide equivalent. The insulator contains 1 to 5 wt % of an Si component, 0.1 to 1 wt % of an Mg component, 2 wt % or less of a Ca component, 0.3 to 6 wt % of a Ba component, and 0.11 to 5 wt % of a rare earth component, in oxide equivalent. In analysis using a scanning transmission electron microscope with a probe diameter of an electron beam set at 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, and an alkaline earth metal at the crystal grain boundary is less than a detection limit.
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