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Thermophysical properties of the molybdenum alloy TZM (Mo-0.5Ti-0.08Zr-0.02C) over a wide temperature range
Nenad Milošević, Ivana Nikolić, Marc Grelard and Bruno Hay
This paper presents experimental results on five thermophysical properties of the TZM alloy over a wide temperature range. Specific heat and specific electrical resistivity were measured from room temperature to 2200 °C and 2450 °C, respectively, normal spectral emissivity at 900 nm from 1150 °C to 2300 °C, hemispherical total emissivity from 1100 °C to 2450 °C and the coefficient of the linear thermal expansion from room temperature to 2000 °C. The specific heat, specific electrical resistivity and both emissivities were obtained by the direct pulse heating technique or pulse calorimetry, while the thermal expansion coefficient by the pushrod dilatometry. The specimens in the form of a thin rod were used, 200 mm in length and 3 mm in diameter in the first, while 25 mm in length and 6 mm in diameter in the second technique. The results are presented and compared with available literature data.
Keywords: Hemispherical total emissivity, high temperature properties, thermal expansion coefficient, molybdenum alloy TZM, normal spectral emissivity, specific electrical resistivity, specific heat