The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 2019
Filed:
Aug. 04, 2017
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Yutaka Yokoyama, Kasugai, JP;
Kuniharu Tanaka, Komaki, JP;
Nobuyoshi Araki, Nagoya, JP;
Hirokazu Kurono, Nagoya, JP;
Toshimasa Saji, Konan, JP;
Yusuke Nomura, Niwa-gun, JP;
Jumpei Isasa, Iwakura, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
An alumina-based sintered body includes 92 mass % to 96 mass % of Al in terms of an oxide, and at least three elements selected from Group II elements, one of the at least three elements being 1.90 mass % or more of Ba in terms of an oxide. The alumina-based sintered body includes the following phases in a grain boundary phase present between alumina crystal grains: a first crystal phase containing Si and at least one of the Group II elements, and a second crystal phase containing Al and at least one of the Group II elements. In X-ray diffraction of the alumina-based sintered body, the maximum relative intensity of the first crystal phase and the maximum relative intensity of the second crystal phase are both 2 or above relative to the maximum diffraction intensity of the alumina crystal.