空心微珠泡沫材料的导热性能研究

Study on the thermal conductivity of foam materials prepared from hollow microspheres

通过烧结空心微珠坯体的方法制备了超低容重空心微珠泡沫材料,研究了温度、样品的容重、开孔气孔率对导热性能的影响规律。结果表明,随着温度的升高,空心微珠泡沫材料的导热系数逐渐增大;材料中的封闭孔部分变成连通孔之后,材料的导热系数增大。空心微珠泡沫材料容重为146kg/m^3时,导热系数为0.054 W/(m·K),容重为100~600kg/m^3的样品,样品导热系数与容重之间的关系曲线为y=0.00023 x+0.

Ultra low bulk density foam materials were prepared by a method of sintering hollow microspheres. The influences of temperature, bulk density and open porosity on the thermal conductivity were studied. It was observed that the thermal conductivity of the obtained foam materials increased with the increasing of temperature. When the closed pores transformed into open pores, the thermal conductivity of foam materials increased. The thermal conductivity of the sample was 0.054 W/（m · K） when the bulk density was 146 kg/m3. When the bulk density was in the range of 100-600 kg/m3 , the relationship between the thermal conductivity and bulk density of the samples was given as：y=0.00023x＋0.028.