The Physical-Mechanism Based High-Temperature Thermal Contact Conductance Model with Experimental Verification

The physical-mechanism based high-temperature thermal contact conductance model is proposed, in which the temperature effect on the material properties and interface radiation effect are considered. A testing platform of high temperature thermal contact conductance is also established, and the thermal contact conductance between three-dimensional braid C/C composite material and superalloy GH600 is tested under different interface roughness and temperatures. Experimental results verify the rationality of the present model. Results also show that it is necessary to take the effect of temperature into account especially at high temperatures, and the interface radiation effect is negligible compared to spot conduction under 850 K.