Denso Corporation

Ishifuku Metal Industry Co., Ltd.

Kenta Terai

Hayato Yasuhara

Ken Hanashi

Ryohei Akiyoshi

Shunsuke Yokota

Ikuya Ando

Nobuo Abe

Satoshi Hara

Shunsuke Takeya

An iridium alloy includes iridium, platinum, and tantalum. A content of the platinum in the iridium alloy falls within a range from 5 wt % to 30 wt %, and a content of the tantalum in the iridium alloy falls within a range from 0.3 wt % to 5 wt %.

Iridium alloy

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.

Heat-resistant Ir alloy

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&#x2264;A&#x3c;6.

Heat-resistant Ir alloy wire

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Soka, Japan

Kenta Terai