中文摘要：

以Si3N4粉末作为增强组分与环氧树脂进行复合，采用模压法制备了氮化硅／环氧树脂复合电子基板材料。研究了Si3N4含量对复合材料导热性能和介电性能的影响。研究结果表明，随着Si3N4含量的增加，复合材料中填料形成导热网络，复合材料的热导率也随之增加，当体积填充量为35％时，导热系数达到1．71W／m·K。复合材料的介电常数随Si3N4含量的增加而增加，但在氮化硅陶瓷颗粒的体积分数达到35％时仍维持在较低的水平（7．08，1MHz）。

英文摘要：

A kind of composite substrate was fabricated using Si3 N4 powder as filler and epoxy as matrix and employing the method of press molding. The effect of volume fraction of Si3 N4 on the thermal conductivity of the composite was investigated and the dielectric constant of the composite was evaluated. Experimental results showed that with the filler content increasing, a thermally conductive network was formed in the composite, thus thermal conductivity and dielectric constant of the composite increased. Thermal conductivity was 1,71W/ m· K when the volume fraction of Si3 N4 reached 35% but its dielectric constant still kept at a relatively low level （7.08 at 1 MHz）.