摘要
电阻应变计是将被测构件的应变量转换为电阻变化的测试单元,是发动机涡轮叶片应力/应变分析监测的有效手段,而电阻应变敏感栅材料是电阻应变计的关键材料。随着发动机推重比不断增大,涡轮前温度越来越高,要求敏感栅材料的工作温度也越来越高。本文阐述了高温电阻应变材料的发展现状,重点介绍贵金属钯基合金、铂基合金电阻应变材料的成分设计、组织与性能、使用温度等特性。其中PtWReNiCr(Y)合金已经成功应用到1000℃动态应变测试;PtRhWZr(Y)可以用于1138℃的动态应变测试;PtRhMoWZr(Y)可望用于1150℃的动态应变测试,工作温度比传统的电阻应变合金Pt-8W提高了近350℃。最后介绍了使用温度更高的金属氧化物应变计的研究现状。
The resistance strain gauge,a testing unit that converts the strain of the tested component into a change in resistance,is an effective tool for the strain analysis in engine turbine blades.The grid sensing material is a key to the resistance strain gauge.With an increase in the thrust-to-weight ratio of engine,the temperature in front of the turbine is getting higher and higher,it is,therefore,necessary to increase the working temperature of grid sensing material as well.The current development status of strain material resistant to high temperature was reviewed in this paper with a focus on the composition design,microstructure and properties,working temperature and other characteristics of precious metal-based alloys such as palladium-based and platinum-based alloys.PtWReNiCr(Y)has been successfully applied to the dynamic strain testing at 1000℃,PtRhWZr(Y)can be used at 1138℃,PtRhMoWZr(Y)is expected to be suitable even at 1150℃,a working temperature about 350℃higher than that achived by the traditional Pt-8W.Finally,the research status of metal oxide strain gauges which can work at higher temperatures was introduced.
作者
万吉高
武海军
杨丽娟
牛海东
卢绍平
郝玉洁
WAN Jigao;WU Haijun;YANG Lijuan;NIU Haidong;LU Shaoping;HAO Yujie(State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Sino-Platinum Metals Co.Ltd.,Kunming 650106,China)
出处
《贵金属》
CAS
北大核心
2023年第4期74-84,共11页
Precious Metals
关键词
高温电阻应变计
电阻应变合金
应变灵敏度系数
电阻温度特性
high temperature resistance strain gage
resistance strain alloy
strain sensitivity coefficient
resistance temperature characteristics
