脉冲加热方法铌热物性参数的动态测量

提出积分球反射法脉冲加热技术测量材料热物性的方法,研制的脉冲加热瞬态热物性测量装置能同时测量铌带状试样温度范围在1100-2700K的比热容、电阻率、全波长半球发射率.装置中高速高温计测量试样的辐射温度,积分球反射计测量试样的法向光谱发射率,即可得出带状试样的真实温度.再通过测得的试样上的电压、电流等数据经计算获得其他热物性参数.对国外的标准铌试样进行了测试,所得测量数据与国外同行数据进行了比对,具有较好的一致性.实验结果表明:比热容测量不确定度为5%,全波长半球发射率测量不确定度为3.5%,电阻率的测量不确定度为3.6%,测量数据可作为航天、军事和民用领域材料应用的设计依据.

Measurement of thermophysical properties of niobium by pulse-heating method

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.