采用基于波导法的电磁参数测试系统测试了纳米碳纤维(CNFs)掺量为水泥质量0、0.05%、0.10%、0.15%、0.20%的CNFs增强水泥基材料在1.7～2.6GHz频率范围内的介电常数,通过分析介电常数实部(ε′)、介电常数虚部(ε″)和介电损耗角正切(tanδe),研究了CNFs对水泥基材料介电损耗性能的影响。结果表明:随着CNFs掺量的增加,水泥基材料的ε′、ε″和tanδe不断增大,极化能力和介电损耗能力不断增强,介电损耗性能不断提高。CNFs的掺增加了杂水泥基材料中的纤维相,且纤维相的介电常数更大,故水泥基材料的介电常数增大。
The dielectric constants of carbon nanofiber (CNFs) reinforced cement-based materials with CNFs content of 0,0.05%,0.10%,0.15% and 0.20% were measured in the frequency range of 1.7～2.6GHz by electromagnetic parameter testing system based on waveguide method.The effects of CNFs on the dielectric loss performance of cement-based materials were studied by analyzing the real part of dielectric constant (ε′),the imaginary part of dielectric constant (ε″) and the dielectric loss tangent (tanδe).The results showed that the ε′,ε″ and tanδe of cement-based materials increased with the increase of CNFs content,and the polarization ability and dielectric loss ability of cement-based materials increased continuously.The addition of CNFs increased the fiber phase in cement-based materials,and the dielectric constant of fiber phase was larger,so the dielectric constant of cement-based materials increased.
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基金资助
国家自然科学基金(52278287,51908548);国家人民防空办公室立项课题(RF20SC01J-S0);陕西省高校科协青年人才托举计划项目(20200415)
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