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公开(公告)号：US20230119721A1
公开(公告)日：2023-04-20
申请号：US17793826
申请日：2021-02-02
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Osamu YOSHIMOTO , Tomoo TANAKA , Kengo HATTORI
Abstract: A noble metal tip for a spark plug according to the present invention contains iridium (Jr) in an amount of 50 mass % or more and aluminum (Al) in an amount of 0.1 mass % or more and 5 mass % or less, and further contains rhodium (Rh), wherein a metallographic structure comprised of fiber-like elements R is observed, and the fiber-like elements R of the metallographic structure have an average aspect ratio of 150 or more and have an average length of 25 μm or less in a minor axis direction.
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公开(公告)号：US20230064238A1
公开(公告)日：2023-03-02
申请号：US17792599
申请日：2021-08-19
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kazuki ITO , Hiroaki IZAWA , Kengo HATTORI
Abstract: A spark plug having a center electrode that includes a columnar noble metal tip at one end thereof, and a ground electrode that forms a spark gap between the ground electrode and a circular discharge surface of the tip. In the tip, a mass % of Pt is largest and a content percentage of Ni is more than or equal to 0 mass % and less than or equal to 40 mass %. In each of both a cross-section of the noble metal tip parallel to the discharge surface and a cross-section of the tip perpendicular to the discharge surface, particles each having an aspect ratio of more than or equal to 1 and less than or equal to 10 occupy more than or equal to 70% of observed particles in an area extending from an outline of the cross-section by a distance of 10% of a diameter of the discharge surface.
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