公开(公告)号：US11616346B2

公开(公告)日：2023-03-28

申请号：US17792599

申请日：2021-08-19

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kazuki Ito ,  Hiroaki Izawa ,  Kengo Hattori

IPC: H01T13/39 ,  C22C5/04 ,  H01T13/32

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 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.