摘要
利用非稳态热丝法测量了 2种纳米氧化铝粉分别分散于水和乙二醇 (EG)中制备成悬浮液的导热系数 .分析研究了悬浮液 pH值、分散剂、纳米氧化铝粉体积含量、基体液体导热系数以及纳米氧化铝粉体团聚状态对悬浮液导热系数的影响 .结果表明 :悬浮液的导热系数随粉体加入量的增加而增加 ;相同体积含量的同一粉体悬浮液 ,基体液体为乙二醇的导热系数相对增加量明显比基体液体为水的大 ;团聚较多的粉体悬浮液的导热系数大于团聚较少粉体的悬浮液 ;pH值对悬浮液的导热系数无明显影响 ;分散剂的加入 ,增大了粉体和基体液体间的界面热阻 。
Nanosized Al 2O 3 suspensions were prepared and their thermal conductivities were measured by using a transient hot_wire method. The experimental results show that the thermal conductivities of the studied suspensions increase obviously with the volume fraction of the solid phase. The ratio of the increase in thermal conductivity of Al 2O 3 suspension with ethylene glycol (EG) is significantly higher than that of Al 2O 3 in water. The agglomeration of nanoparticles helps to enhance the thermal conductivity of the suspensions. The pH value of the suspensions appears to have no obvious effect on the enhancement of the thermal conductivity. The dispersant added in aqueous suspension lowers the thermal conductivity of the suspension.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第3期272-276,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目 (5 0 0 0 60 14 ) .
