碳热法生产稀土硅化物合金的物料性质(Ⅰ)——热物性参数与电阻率

Physical properties of raw materials used in producing rare earth silicide alloy by carbon thermal reduction method(Ⅰ) ——Thermophysical properties and specific resistance

用非稳态热线法测定了碳热法生产稀土硅化物合金原料的导热系数 ,用激光脉冲法测定了稀土硅化物合金的导热系数、热扩散系数和比热容。在 2 88～ 1 573K内 ,原料的导热系数与温度的关系可表示为 :λ =2 .56×1 0 - 2 + 7.8× 1 0 - 4 T(W·m- 1 ·K- 1 ) ;在 2 88～ 1 2 73K内 ,稀土合金的导热系数与温度的关系可表示为 :λ =1 4.30- 7.4× 1 0 - 3 T(W·m- 1 ·K- 1 )。还测定了原料中两种稀土配碳团块在 773K和 1 2 73K焙烧后的电阻率。

The thermal conductivity of raw materials, used in the process of producing rare earth silicide alloy by carbon thermal reduction method, was measured from 288 K to 1 573 K by unsteady state hot wire method. The relation between thermal conductivity ( λ ) of raw materials and temperature ( T ) can be written as λ =2.56×10 -2 +7.8×10 -4 ? T . The thermal conductivity, the thermal diffusivity, and the specific heat capacity of the rare earth silicide alloy were also measured from 288 K to 1 273 K. The dependence of the thermal conductivity ( λ ) of the alloy on temperature ( T ) follows a linear equation: λ =14.30-7.4×10 -3 ? T . The specific resistance was also determined for two kinds of rare earth carbon compact roasted at 773 K and 1 273 K respectively.