论文部分内容阅读
在 1 0 2 ～ 1 0 7Hz频率范围内测定了酚醛树脂 -高铝水泥基无宏观缺陷 (MDF)材料的介电常数和介电损耗随材料组成及环境湿度的变化曲线 .结果表明 ,MDF材料的介电常数和损耗皆与测试频率有关 ,介电损耗由载流子屏蔽跳跃引起 .当材料内酚醛树脂的数量增加时 ,介电常数下降而损耗略有上升 ,添加硅灰能显著改善材料介电性能 ;在低相对湿度下 ,湿度对介电性能影响不大 ,在高相对湿度下 ,介电常数和损耗都有较大的增加
The dielectric constant and dielectric loss of phenolic resin-high alumina cement-free macroscopic defect (MDF) material with the composition of the material and the humidity of the environment were measured in the frequency range of 102 ~ 170Hz.The results show that the MDF material Of the dielectric constant and loss are related to the test frequency, the dielectric loss caused by the carrier shielding jump when the amount of phenolic resin material increases, the dielectric constant decreases and the loss increases slightly, adding silica fume can significantly improve the material Dielectric properties; at low relative humidity, humidity has little effect on the dielectric properties, high relative humidity, dielectric constant and loss have a greater increase