一种自焙炭块的导热系数

来源期刊：中国有色金属学报1998年第4期

论文作者：薛向欣 段培宁 黄晓煜 杜英敏

文章页码：652 - 656

关键词：自焙炭块； 导热系数； 石墨化度； 比热容； 热扩散率

Key words：self-baking carbon brick; heat conductivity; graphitization degree; bulk density; special heat capacity; thermal diffusivity

摘    要：利用激光脉冲法、铜卡量热计法和浸渍法分别测定了不同石墨化度的自焙炭块的热扩散系数α、恒压比热容c_p和体积密度D_b，并据λ=D_bc_pα求出200～1100 ℃该炭块的导热系数λ。结果表明：原始自焙炭块的λ值随温度升高而增大，这可能是由于测试过程中石墨化度随温度升高而明显增加，且λ值与石墨化度成正比所致； 恒温下，λ值随石墨化度增加而增大；在石墨化度较高时，λ值随温度升高而稍有降低。当石墨化度在0.7以上时，国产自焙炭块的λ值接近美国UCAR炭砖的值。

Abstract: Temperature dependence of heat conductivity λ of self-baking carbon brick (SBCB) in temperature range of 200～1100 ℃ has been estimated by using a formula λ=αc_p D_b combining with the measured data of thermal diffusivity α (laser pulse), heat capacity c_p (calorimetry) and bulk density D_b (retting method) of the SBCB with different graphitization degrees. The results showed that the heat conductivity λ of the original SBCB is increased with the increment of temperature, and that of the SBCB is increased with the increment of graphitizati on degrees at a given temperature, while that of the SBCB with higher graphitization degrees is decreased slowly with the increment of temperature. For the SBCB with graphitization degree of 0.7227, its λ is more than 14 W/mK . It is true to think that the heat conductivity of the SBCB made in domestic technique is closed to that of the NMA brick of the UCAR.