Based on the given physical model, a mathematical model of heat transfer process in the material’s specimen (infinite plate of known thickness) can be presented as follows [4]:
To determine the heat flux on the specimens’ back faces, the sensitive elements are installed there in the form of thin copper plates of 60 ×60 ×0.3mm in size with guard masks (frames) from the same material, se Fig. 3. Two identical specimens have been made for testing: 1a, 1b of the material ETTI-CF-ULT and 2a, 2b of the material ETTI-CF-ERG. A photograph of one of the specimens prior to installation of thermocouples and heat flux sensor is presented in Fig. 4.
When installed on the specimen’s heating surfaces, the thermocouples were fixed on the surface by means of a special thermoresistant compound. The thermocouple junction relative to the specimen’s surface was hence under control. The heat flux sensors with guard masks (frames) installed on the back faces of the specimens were also fixed on the specimen’s surface by means of a special thermoresistant compound. Prior to the thermocouple installation, the calibration and functional test was made. A picture of the EM with installed specimens and removed upper plate of the heat-insulating holder is shown in Fig. 5. The assembled experiment module was installed in the vacuum chamber of stand TVS-1.
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