【摘要】 本文首次采用高速剪切法对微米级的氮化硼粉末（h-BN）进行剥离，得到六方氮化硼纳米片（BNNSs）。以环氧树脂（EP）为基体，氮化硼纳米片为导热填料，制备了高导热率的导热复合材料。研究了氮化硼的含量、剥离时间对复合材料微观组织、导热性能以及力学性能的影响。结果表明，通过高速剪切法成功制备出均匀的、厚度为纳米级的氮化硼纳米片。剥离时间为15 min，填料质量分数为30%时，复合材料的导热系数为1.204 W/（m·K），比环氧树脂基体的导热系数增长了462%。更多还原

【Abstract】 In this paper,high-speed shearing method was used for the first time to peel off micron-sized boron nitride powder(h-BN)to obtain hexagonal boron nitride nanosheets(BNNS). Epoxy resin(EP)was used as the matrix and boron nitride nanosheets as the thermal conductive filler to prepare thermally conductive composites with high thermal conductivity. The effects of boron nitride content and peeling time on the microstructure,thermal conductivity and mechanical properties of the composites were studied. The results show that uniform boron nitride nanosheets with nanometer thickness were successfully prepared by high-speed shearing method. When the peeling time was 15 min and the filler mass fraction was 30%,the thermal conductivity of the composite was 1.204 W/（m·K）,which was462% higher than that of the epoxy matrix.更多还原