| 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. |
