| 无宏观缺陷水泥基复合材料的介电性能 |
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| 引用本文： | 王君达,谈慕华,吴科如. 无宏观缺陷水泥基复合材料的介电性能[J]. 同济大学学报(自然科学版), 2000, 28(2): 168-171 |
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| 作者姓名： | 王君达 谈慕华 吴科如 |
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| 作者单位： | 1. 浦东新区城市建设科学技术委员会,上海,200126
2. 同济大学,混凝土材料研究国家重点实验室,上海,200092 |
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| 摘 要： | 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
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| 关 键 词： | 酚醛树脂 MDF材料 介电性能 相对湿度 |
Dielectric Properties of Macro-defect-free Cement Based Composites |
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| WANG Jun-da,TAN Mu-hua,WU Ke-ru. Dielectric Properties of Macro-defect-free Cement Based Composites[J]. Journal of Tongji University(Natural Science), 2000, 28(2): 168-171 |
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| Authors: | WANG Jun-da TAN Mu-hua WU Ke-ru |
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| Abstract: | The dielectric constant and loss factor of phenol resin-high alumina MDF composites as a function of their composition and relative humidity are determined at the frequency range from 10 2 to 10 7 Hz. The test results show that the dielectric constant of the composites decreases with increasing the content of phenol resin while the loss factor increases slightly. Both dielectric constant and loss factor increase seriously with increasing relative humidity. Silica fume can contribute to improve the dielectric properties of the composites. |
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| Keywords: | phenol resin macro-defect-free cement dielectric properties relative humidity |
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