A new millisecond high-temperature pulse calorimeter

A new pulse-heating system for resistive self-heating of metallic specimens has been constructed for the accurate measurement of thermophysical properties. A controlled high current pulse is used to heat alloys in a time interval of approximately 1 s from room temperature into the melting range. From time-resolved measurements of current and voltage drop across the specimen. enthalpy and electrical resistivity are determined. A high-speed pyrometer is used to measure the (time-dependent) temperature of the specimen. From these measured quantities, specific enthalpy, heat capacity, and electrical resistivity as a function of temperature are obtained. Measurements of these thermophysical properties of a pure element have been performed and compared with results of another research group in order to check the accuracy of the system. Results of measurements of a selected technical alloy are reported.