公开(公告)号：US20220170136A1

公开(公告)日：2022-06-02

申请号：US17538320

申请日：2021-11-30

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Kenta TERAI ,  Hayato YASUHARA ,  Ryohei AKIYOSHI ,  Ken HANASHI ,  Ikuya ANDO

IPC: C22C5/04 ,  B22F5/12

Abstract: Provided is an Ir alloy wire, which is further improved in oxidation wear resistance while ensuring a Vickers hardness. The Ir alloy wire includes: 5 mass % to 30 mass % of Rh; and 0.5 mass % to 5 mass % of Ta, wherein an average value A for an aspect ratio (crystal grain length/crystal grain width) of a structure of the alloy wire in a range of a depth of 0.05 mm or less from a surface of the alloy wire satisfies 1≤A

公开(公告)号：US20220282358A1

公开(公告)日：2022-09-08

申请号：US17412661

申请日：2021-08-26

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Yoshinori DOI ,  Ryohei AKIYOSHI ,  Ken HANASHI

IPC: C22C28/00

Abstract: Provided is an Ir alloy which is excellent in high temperature strength while ensuring oxidation wear resistance at high temperature. The Ir alloy consists of: 7 mass % or more, and less than 10 mass % of Rh; 0.5 mass % to 5 mass % of Ta; 0 mass % to 5 mass % of at least one kind of element selected from among Co, Cr, and Ni; and Ir as the balance, wherein a total content of the Ta and the at least one kind of element selected from among Co, Cr, and Ni is 5 mass % or less.

公开(公告)号：US20170288373A1

公开(公告)日：2017-10-05

申请号：US15472673

申请日：2017-03-29

Applicant: DENSO CORPORATION

Inventor： Kenichi ARAYA ,  Koji YAMANAKA ,  Ken HANASHI

IPC: H01T13/39 ,  H01T21/02 ,  H01T13/32

CPC classification number: H01T13/39 ,  H01T13/32 ,  H01T21/02

Abstract: A spark plug has an elongated center electrode, ground electrode, convex part and noble metal coating layer. The center electrode is held in a housing. The ground electrode has a tip end opposing part opposing the center electrode. The convex part is extended from the tip end opposing part to an opposing part face in an axial direction of the spark plug. A spark discharge gap is formed between a tip end part of the center electrode and the convex part. The noble metal coating layer covers a surface of the convex part. The noble metal coating layer has an end face coating layer covering a projecting end face of the convex part and a side face coating layer covering at least a part of a side face of the convex part extended from the projecting end face. A root part of the side face coating layer is buried in the tip end opposing part. An extension is formed so that at least a part of the root part is extended to an outside of the spark plug along the opposing part face.

公开(公告)号：US20220170135A1

公开(公告)日：2022-06-02

申请号：US17538264

申请日：2021-11-30

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Kenta TERAI ,  Hayato YASUHARA ,  Ryohei AKIYOSHI ,  Ken HANASHI ,  Ikuya ANDO

IPC: C22C5/04

Abstract: Provided is an Ir alloy, which is further improved in Vickers hardness. Specifically, provided is a heat-resistant Ir alloy, including: 5 mass% to 30 mass% of Rh; 0.5 mass% to 5 mass% of Ta; and 0.003 mass% to 0.15 mass% of at least one kind selected from the group consisting of: Sc; Hf; and W, with the balance being Ir.

公开(公告)号：US20190386467A1

公开(公告)日：2019-12-19

申请号：US16551912

申请日：2019-08-27

Applicant: DENSO CORPORATION

Inventor： Noriaki NISHIO ,  Masamichi SHIBATA ,  Kanechiyo TERADA ,  Ken HANASHI ,  Ryohei AKIYOSHI ,  Fumiaki AOKI

IPC: H01T13/32

Abstract: A center electrode is held in insulating glass, in which a tip end portion of the center electrode protrudes. A ground electrode has a connection part connected to a housing. The ground electrode forms a spark discharge gap between the center electrode and the ground electrode. The ground electrode has a ground base material that includes the connection part and a ground protrusion part that protrudes from the ground base material toward the center electrode and forms the spark discharge gap between the center electrode and the ground electrode. An angle between a ground discharge surface of the ground protrusion part and a side surface of the ground protrusion part is a right angle or an acute angle. At least a portion of the side surface of the ground protrusion part and at least a portion of a side surface of the ground base material are flush with each other.

公开(公告)号：US20190338395A1

公开(公告)日：2019-11-07

申请号：US16471054

申请日：2017-12-20

Applicant: ISHIFUKU METAL INDUSTRY CO., LTD. ,  DENSO CORPORATION

Inventor： Shunsuke YOKOTA ,  Yoshinori DOI ,  Ryohei AKIYOSHI ,  Ken HANASHI

IPC: C22C5/04

Abstract: An Ir alloy is excellent in high temperature strength while ensuring oxidation wear resistance at high temperature. The heat-resistant Ir alloy includes: 5 mass % to 30 mass % of Rh; 0.3 mass % to 5 mass % of an element group A made of at least one kind of element selected from among Ta and Re; and 0 mass % to 5 mass % of an element group B made of at least one kind of element selected from among Co, Cr, and Ni, wherein the heat-resistant Ir alloy includes 5 mass % or less of the element group A and the element group B in total, and wherein, when the at least one kind of element in the element group A includes Re, the at least one kind of element in the element group B is Co alone, Cr alone, or two or more kinds selected from Co, Cr, and Ni.

公开(公告)号：US20180062356A1

公开(公告)日：2018-03-01

申请号：US15690756

申请日：2017-08-30

Applicant: DENSO CORPORATION

Inventor： Ken HANASHI ,  Ryohei AKlYOSHI ,  Tomoyuki WATANABE

IPC: H01T13/32 ,  H01T13/39 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/39 ,  H01T21/02

Abstract: In the spark plug, at least one of the center chip and the ground chip is bonded with a center electrode or a ground electrode. The selected chip has a first part formed so as to linearly extend along a first center axis of an electrode bonded with the first part and a second part formed so as to extend linearly from a tip end of the first part along a second central axis inclined with respect to the first central axis.