| ZHANG Jian-guo, YAN Xiu-wen.Effects of Heat Treatment on Performance of Pt-PtRh13 Thin-film Thermocouple Insulating Layer and Its Mechanism Analyzing[J].航空发动机,2015,41(4):84-87 |
| Effects of Heat Treatment on Performance of Pt-PtRh13 Thin-film Thermocouple Insulating Layer and Its Mechanism Analyzing |
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| Key Words:thin-film thermocouple Pt-PtRh13 ion beam sputtering heat treatment thermal stability aeroengine |
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| Abstract:In order to measure surface temperature of aeroengine high temperature components, Pt-PtRh13 thin-film thermocouples are fabricated by ion beam sputtering technique. The samples are multi-layer structures which are composed of Ni-based super alloy substrates NiCrAlY buffer layerAl2O3 layer Al2O3 insulating layerPt-PtRh13 thin-film thermocouple and Al2O3 protecting layer. The effects of heat treatment on the properties of Pt-PtRh13 thin-film thermocouple insulating layer and the degradation mechanism about Al2O3 insulating layer were analyzed using SEMXRD. The results show that Pt-PtRh13 thin-film thermocouple using Al2O3 insulating layer are compliant with measuring surface temperature below 900° and maybe cause instability trouble when using in more than 900°environment longtime. High temperature is the main reason that induces crystal phase transition of Al2O3 insulating layer. |
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