METAL WIRE MADE OF IRIDIUM OR IRIDIUM ALLOY

• Main Authors: YOSHIKAWA AKIRA, SAKAIRI KOICHI, YOKOTA YUI, TANAKA KUNIHIRO, NAKAZAWA TATSUYA, NAKAMURA MUNEKI
• Format: Patent
• Language: English; Japanese
• Published: 02.11.2015
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a metal wire that is made of iridium or an iridium alloy and has excellent oxidative consumption resistance and mechanical properties in a high-temperature atmosphere.SOLUTION: The present invention is a metal wire made of iridium or an iridium-containing alloy. In the metal wire, the number of crystal grains in an arbitrary longitudinal cross section is 2-20 per 0.25 mm, and the Vickers hardness of any given portion is 200 Hv or more and less than 400 Hv. This iridium wire is a material that is produced by the μ-PD method, is in a state where residual stress is small, and has a small change in the number of crystal grains and hardness even when heated to the recrystallization temperature (1,200-1,500°C) or higher. 【課題】イリジウム又はイリジウム合金からなる金属線材であって、高温雰囲気下での耐酸化消耗性、機械的特性に優れたものを提供する。【解決手段】本発明は、イリジウム又はイリジウム含有合金からなる金属線材であって、長手方向の任意断面における結晶粒数が０．２５ｍｍ２当たり２〜２０個であり、更に、任意部分のビッカース硬度が２００Ｈｖ以上４００Ｈｖ未満である金属線材である。このイリジウム線材は、μ−ＰＤ法により製造され残留応力の少ない状態にあり、再結晶温度（１２００℃〜１５００℃）以上に加熱されても、結晶粒数や硬度の変化が少ない材料である。【選択図】図３