文章摘要
铱及铱铑合金的高温氧化性能研究
Study on High Temperature Oxidation Performance of Iridium and Iridium-Rhodium Alloy
投稿时间:2017-07-04  修订日期:2017-09-07
DOI:10.14093/j.cnki.cn10-1132/d.2018.01.003
中文关键词: 金属材料    铱铑合金  氧化性能  高温
英文关键词: metallic material  iridium  iridium rhodium alloy  oxidation performance  high temperature
基金项目:国家自然科学基金(51361015,51661014)、云南省应用基础研究重点项目(2016FA053)、云南省技术创新人才项目(2013HB112)。
作者单位
凌胜利 外交学院国际关系研究所 北京 ,100037 
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中文摘要:
      :将纯铱及不同铑含量的铱铑合金锭,在空气中于1550℃氧化10 h,研究样品失重和晶相组织变化。失重实验表明,铱及铱铑合金的失重率随着铑含量的增加而减小;铑含量为30%~50%的铱铑合金失重率仅为纯铱的一半。晶界观察发现,铱及铱铑合金锭在高温氧化环境下均发生晶界氧化腐蚀;随着铑含量的增加,晶界氧化深度变浅,宽度变窄;含铑70%~80%的铱铑合金表面腐蚀轻微。能谱分析结果表明,氧化后样品表面铱的含量明显降低。研究结果表明铱的腐蚀是氧化挥发所致,在合金中增加铑的含量可以提高铱铑合金的高温稳定性。
英文摘要:
      Pure iridium and iridium-rhodium alloys ingots were first oxidized in air at 1550℃ for 10 h, and their weight loss and microstructures were investigated. Weight loss experiments showed that the weight loss rate of iridium and iridium-rhodium alloys decreases with the increase of rhodium content. The weight loss of iridium-rhodium alloys with 30%~50% Rh is only half that of pure iridium. Grain boundary observations showed that grain boundary oxidation corrosion occurred both in the iridium and iridium-rhodium alloys ingots under high temperature oxidation conditions. With the increase of rhodium content, the grain boundary oxidation depth became shallow and the width became narrower. The iridiumrhodium alloys with 70%~80% rhodium corroded slightly. The energy spectra showed that the composition of iridium decreased obviously after oxidation. The corrosion of iridium is caused by oxidation and volatilization. Increasing the content of rhodium in the alloys can improve the high temperature stability of the iridium-rhodium alloys.
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