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WRe5/WRe20热电偶于2013年列入国家标准,但是与之配用的补偿导线合金丝的研制仍属空白。文章设计了Cu-Ni-Si合金体系,通过真空感应熔炼、拉拔、热处理制备了补偿导线合金丝(负极),测试了其与纯铜丝(正极)的热电势及拉伸性能,表征合金显微组织。研究了Ni、Si含量和热处理工艺对各项性能的影响。结果表明:随Si含量减少及Ni含量增加,合金热电势增加;随退火温度升高,合金热电势降低;成分为Ni:2.46wt%、Si:0.177wt%和Ni:2.46wt%、Si:0.18wt%的两种铜合金丝,经600℃、60 min退火,其与纯铜丝配对的补偿导线各项性能达到JB/T 9496—2014标准。符合WRe5/WRe20热电偶配用补偿导线合金丝的要求。
WRe5 / WRe20 thermocouple included in the national standard in 2013, but with the allocation of compensation wire alloy wire research is still blank. In this paper, Cu-Ni-Si alloy system is designed. The compensating wire alloy wire (negative electrode) is prepared by vacuum induction melting, drawing and heat treatment. The thermoelectric power and tensile properties of the wire are tested with pure copper wire Microstructure. The effects of Ni, Si content and heat treatment process on each property were studied. The results showed that the thermoelectric power of the alloy increased with the decrease of Si content and the increase of Ni content. The thermoelectric power of the alloy decreased with the increase of annealing temperature. The composition of the alloy was 2.46wt% Ni, 0.177wt% Si and 2.46wt% Ni, 0.18wt% of the two kinds of copper alloy wire, annealed at 600 ℃, 60 min, the performance of the compensation wire matching with pure copper wire to JB / T 9496-2014 standards. Meet WRe5 / WRe20 thermocouple with compensation wire alloy wire requirements.