利用溶胶-凝胶技术制备了纳米氧化铝改性纳迪克酰亚胺复合材料.采用傅里叶红外光谱(FTIR)、扫描电镜(SEM)和原子力显微镜(AFM)等手段对该材料的结构及表面断裂形貌进行了表征,其粒子尺寸为40～100 nm.研究了氧化铝添加量对该复合材料耐电晕性能和耐热性能的影响.结果表明:随着氧化铝含量的增加,材料的耐电晕性能显著增强,当纳米氧化铝质量分数为16%、试样厚度25 μm、击穿场强60 kV/mm时,耐电晕寿命达130 h,是改性前的11倍;热分解温度为498.63℃,比掺杂前提高20℃,剪切强度略有降低.
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