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采用不同尺度和形貌的α-氧化铝(α-Al_2O_3)复配制备环氧树脂绝缘复合材料,运用扫描电子显微镜观察复合材料形貌,运用介电强度测试仪、动态机械热分析仪、激光热导仪等研究α-Al_2O_3复配对材料介电性能和热性能的影响。结果表明:多尺度无规α-Al_2O_3(12μm/2μm)复配提高了环氧树脂的击穿强度、击穿稳定性及玻璃化温度,热导率略有下降;小粒径球形α-Al_2O_3(2μm)与无规α-Al_2O_3(12μm)复配,热导率有所提高,但是降低了环氧树脂的击穿性能及玻璃化温度。这主要归因于不同尺度和形貌的α-Al_2O_3和环氧基体间的界面和体系间的空隙不同。
Epoxy resin insulating composites were prepared by compounding α-alumina (α-Al_2O_3) with different scales and morphologies. The morphology of composites was observed by scanning electron microscopy. The dielectric strength tester, dynamic mechanical thermal analyzer, Thermal conductivity instrument to study the α-Al 2 O 3 compound on the dielectric properties and thermal properties. The results show that the multi-scale random α-Al_2O_3 (12μm / 2μm) compound increases the breakdown strength, breakdown stability and glass transition temperature of epoxy resin, and decreases the thermal conductivity slightly. The small particle size α-Al_2O_3 (2μm) and random α-Al_2O_3 (12μm), the thermal conductivity is improved, but the breakdown and glass transition temperature of the epoxy resin are reduced. This is mainly due to the different scales and morphology of the α-Al 2 O 3 and epoxy matrix interface and the gap between the different systems.