原料粒径对泡沫玻璃导热系数的影响

Effect of particle size on thermal conductivity of foam glass

采用不同粒径高温熔制料制备出了具有不同气孔结构的泡沫玻璃,并利用不同气孔率影响模型研究了气孔率、气孔尺寸和气孔形状等参数对导热系数的影响.结果表明,随着原料粒径的增加,气孔率和气孔尺寸随之减小,气孔形状更趋近于球形;而导热系数则随着气孔率减小、连通孔增多、球形气孔数量的减小而增加,其中气孔率对其变化影响更大.

In this paper,foam glasses with different pore structures were prepared by high temperature melting method using raw materials with different particle sizes.The influences of porosity,pore size and shape on the thermal conductivity of foam glass were discussed based on the porosity influence model.The results show that,firstly,the porosity and pore size decrease with the decrease of porosity.At the same time,the shape of the pores is closer to the sphere.Secondly,both the decrease of the porosity and the number of spherical pores and the increase of connected pores will cause the increase of the thermal conductivity of foam glass.And the porosity has the most significant effect on its change.