摘要
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 insulation composites were prepared withα-Al2O3 composite particles by melting casting method.The morphology of composites were observed by scanning electron microscopy（SEM）and the effect of size and morphology ofα-Al2O3 on the dielectric and thermal properties of composites were investigated by dielectric strength tester,dynamic mechanical thermal analyzer and laser thermal conductivity meter.The results showed that multiscale randomα-alumina（12μm/2μm）composite particles improved the breakdown strength,breakdown strength distribution and glass transition temperature,but deteriorate thermal conductivity slightly.Conversely,random/sphericalα-alumina（12μm/2μm）composite particles improved thermal conductivity,but deteriorate breakdown strength and glass transition temperature.It was attributed to both the interfacial interaction and void in the composites.
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第7期43-45,共3页
New Chemical Materials
基金
科技部国际科技合作项目(2011DFR50200)
科技部重大科学研究计划项目(863)(2013AA031803)
