Epoxy / Si3N4 composites were fabricated by casting method. The effects of the Si3N4 content on thermal and mechanical properties of the composites were investigated. The results indicated that with the Si3N4 content increasing, the thermal conductivity and heating rate of the composites increased. When the volume fraction of Si3N4 was 25%, the thermal conductivity was 0.511 W/(m·K). And the average coefficient of linear thermal expansion decreased with the Si3N4 content increasing. When the volume fraction of Si3N4 was 25%, the average coefficient of linear thermal expansion was 49.18×10-6/℃. The shear strength of the composites increased first and then decreased with the Si,N4 content increasing up to 4.76 Mpa.%通过浇注工艺制备环氧树脂(EP)/Si3N4复合材料,研究Si3N4含量对复合材料的热学和力学性能的影响.结果表明,复合材料的热导率和升温速率随Si3N4含量的增加而增大,当Si3N4体积分数为25％时,热导率达到0.511W/(m·K),平均线性热膨胀系数随Si3N4含量的增加不断下降,在Si3N4体积分数为25％时,平均线性热膨胀系数为49.18×10-6/℃,而EP/Si3N4复合材料的剪切强度则随着Si3N4的含量的增加先升高后下降,最高达47.6 MPa.
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