NOBLE METAL ALLOY FOR SPARK PLUG AND METHOD FOR PRODUCING AND PROCESSING THE SAME

WIPO Patent Application WO/2008/013159

A1

Disclosed is a material for noble metal chips of spark plugs, which is more excellent in durability, especially in oxidation wear resistance than conventional ones. Specifically disclosed is a noble metal alloy for spark plugs, which contains 0.2-6.0% by weight of Cr as an indispensable component, while further containing at least one of Fe and Ni with the balance of Ir. The addition amount of Fe and/or Ni is preferably 2.0-12.0% by weight in total. The surface of the noble metal alloy may be oxidized and have an oxide layer composed of a Cr-Fe oxide, a Cr-Ni oxide or a Cr-Fe-Ni oxide. The oxide layer is formed by a diffusion treatment, namely heating at 300-900˚C in an oxidizing atmosphere, and preferably has a thickness of 5-100 μm.

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TANAKA, Kunihiro (26 Suzukawa Isehara-sh, Kanagawa 46, 2591146, JP)
田中 邦弘 (〒46 神奈川県伊勢原市鈴川２６番地 田中貴金属工業株式会社 伊勢原工場内 Kanagawa, 2591146, JP)
SAKAIRI, Koichi (2-73 Shin-machi, Hiratsuka-sh, Kanagawa 76, 2540076, JP)

JP2007/064482

January 31, 2008

July 24, 2007

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TANAKA KIKINZOKU KOGYO K.K. (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 22, 1006422, JP)
田中貴金属工業株式会社 (〒22 東京都千代田区丸の内２丁目７番３号 Tokyo, 1006422, JP)
TANAKA, Kunihiro (26 Suzukawa Isehara-sh, Kanagawa 46, 2591146, JP)
田中 邦弘 (〒46 神奈川県伊勢原市鈴川２６番地 田中貴金属工業株式会社 伊勢原工場内 Kanagawa, 2591146, JP)

C22C5/00; C22C1/04; C22F1/14; H01T13/39; H01T21/02

TANAKA AND OKAZAKI (Hongo K & K Bldg, 30-10 Hongo 3-chome,Bunkyo-k, Tokyo 33, 1130033, JP)

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