Experimental investigation of refractory metals in the premelting region during fast heating

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Senchenko, V.N.^1 ; Belikov, R.S.^1 ; Popov, V.S.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^1

关键词: Capacitor discharge;    Experimental investigations;    High-accuracy;    Large current;    Sample temperature;    Specific enthalpy;    Specific resistivities;    Temperature feedback;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012100/pdf
DOI  :  10.1088/1742-6596/653/1/012100

来源: IOP

【 摘 要 】

This work demonstrates experimental possibility of investigation of high refractory materials around its melting point, particularly in premelting region with high accuracy. In this article authors describe the developed experimental setup based on rapid resistive self-heating of a sample by a large current pulse generated by a capacitor discharge circuit that allow fast pulse interruption by temperature feedback signal. The sample temperature was measured with a two-channel microsecond radiation pyrometer. Preliminary experiments were conducted on tantalum and molybdenum at heating speed of 108K/s. The method allows investigating thermophysical properties of refractory conductive materials such as melting temperature, melting heat, specific resistivity, specific enthalpy and specific heat capacity in solid and liquid phase, especially in premelting area.