Measurement of thermophysical properties of niobium by pulse-heating method

Abstract:

The technique for measuring the thermophysical properties of niobium with pulse-heating method is proposed.The heat capacity,electric resistivity,and hemispherical total emissivity of niobium were measured in the temperature interval of 1100 -2700 K.A subsecond pulse-heating technique was applied to strip specimens and the radiation temperature was measured by high-speed pyrometry.Normal spectral emissivity of the strips was measured by integrating sphere reflectometry.The results obtained were discussed and compared with those in literatures.It is shown that reported uncertainties for the properties are as 5% for heat capacity,3.6% for electric resisitivity,and 3.5% for hemispherical total emissivity.Thus the proposed technique for measurement is feasible.