摘要
模拟1400℃富含Pt-Rh的使用环境,研究R型热电偶(Pt-13Rh/Pt)在高温下的衰减机理。分析竹节状缩颈现象的形成原因,讨论引起热电动势衰减的因素。结果表明,在富含气相Pt-Rh的高温环境下,热电偶外瓷珠表面沉积了固态的Pt、Rh,导致绝缘电阻的降低以及实际测温点向低温区转移,最终导致热电动势衰减。
By simulating the operating environment of type R thermocouple(Pt-13Rh/Pt)with rich Pt-Rh gas phase at 1400°C,the attenuation mechanism of thermocouple at high temperature was studied.The causes of the bamboo-like necking phenomenon are analyzed and the factors induced the attenuation of thermal electromotive force(EMF)are discussed.The results showed that solid platinum and rhodium were deposited on the surface of the outer porcelain beads of the thermocouple in high temperature environment which was rich in gas phase platinum and rhodium.This leaded to a decrease in insulation resistance and a shift of the actual temperature measuring point to a lower temperature region,which ultimately resulted in the attenuation of EMF.
作者
熊雅玲
陆玖鹏
耿怀亮
李雪娇
梅若冰
XIONG Ya-ling;LU Jiu-peng;GENG Huai-liang;LI Xue-jiao;MEI Ruo-bing(Nanjing University of Science&Technology,Nanjing 210094,China;Wuxi International Platinum Co.Ltd.,Wuxi 214194,Jiangsu,China)
出处
《贵金属》
CAS
CSCD
北大核心
2020年第2期7-10,15,共5页
Precious Metals
关键词
金属材料
R型热电偶
高温
热电动势
衰减机理
metal materials
type R thermocouple
high temperature
thermal EMF
attenuation mechanism
作者简介
第一作者:熊雅玲,女,工程师,研究方向:贵金属材料。E-mail:326366602@qq.com。
