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.

公开(公告)号：US10958045B2

公开(公告)日：2021-03-23

申请号：US16965752

申请日：2019-09-03

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Daisuke Sumoyama ,  Kazuki Ito

IPC: H01T13/39 ,  C22C5/04 ,  C22C19/05

Abstract: In a spark plug, a base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.01 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 5 mass % or less of Fe. A discharge member contains at least Pt of a P group (Pt, Rh, Ir, and Ru) and Ni. The atomic concentration K of the P group of the discharge member, the atomic concentration L of the P group of the base material, the atomic concentration M of Ni of the discharge member, and the atomic concentration N of Ni of the base material satisfy (K+L)/(M+N)≤1.14.

公开(公告)号：US09887519B1

公开(公告)日：2018-02-06

申请号：US15623817

申请日：2017-06-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kazuki Ito ,  Daisuke Sumoyama ,  Tsutomu Shibata

IPC: H01T13/39 ,  H01T13/16

CPC classification number: H01T13/39 ,  C22C19/058 ,  H01T13/16

Abstract: A spark plug having a center electrode and a ground electrode that form a gap therebetween. At least one of the center electrode and the ground electrode includes a portion formed of a nickel alloy containing nickel as a major component and 20% by mass or more of chromium. In the portion, formed of the nickel alloy, of the electrode, the content of silicon is 0.1% by mass or more, the total content of one or more particular elements selected from the group consisting of rare earth elements is 0.01% by mass or more, and the area percentage of voids in the total area of a cross-section parallel to a longitudinal direction is 1% or less.

公开(公告)号：US10965104B2

公开(公告)日：2021-03-30

申请号：US16966093

申请日：2019-09-03

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Daisuke Sumoyama ,  Kazuki Ito

IPC: H01T13/39 ,  C22C19/05

Abstract: A spark plug capable of avoiding a discharge member bonded to a base material from peeling off easily is provided. The spark plug includes: a first electrode including a base material and a discharge member having at least a portion thereof bonded to the base material with a diffusing layer interposed therebetween; and a second electrode facing the discharge member with a spark gap interposed therebetween. The base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.05 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 0.04 mass % or less of Fe.