摘要：目前，常用作吸波材料的纤维有碳纤维、碳化硅纤维和磁性金属纤维等，而炭纤维不但能作结构吸波材料，而且其短纤维还能作为涂覆型吸波材料的吸收剂使用[1]。早在20世纪70年代普通炭纤维的应用就表现出了较好的吸波性能。根据研究发现聚丙烯腈纤维的吸波性能是与其炭化程度相关的，故本课题拟采用聚丙烯腈基炭纤维丝，考察不同炭化温度（400℃，500℃，600℃，718℃，920℃，1131℃，1286℃）下的聚丙烯腈基炭纤维的组成与结构，并通过其介电常数、磁导率等的表征来测试其吸波性能。通过XRD和红外（IR）对炭纤维的晶格参数和结构的分析，再通过矢量网络分析仪对其介电常数，磁导率，介电损耗，磁损耗和反射损耗的各项表征，结合理想吸波材料的介电匹配特性电磁参数可以得出聚丙烯腈基炭纤维的吸波性能。综合多方面性能得出在718℃炭化的炭纤维吸波性能是所做七组实验中吸波性能最好的，所以并不是炭化温度越高所得到的炭纤维的吸波性能越好。69512

关键词：聚丙烯腈基炭纤维；吸波性能；介电常数；磁导率；反射损耗。

. Study on Microwave Absorbing Properties of Polyacrylonitrile - based Carbon Fiber

Abstract：At present, the fiber commonly used as absorbing material has carbon fiber, silicon carbide fiber and magnetic metal fiber, etc., and carbon fiber can not only make structural absorbing material, and its short fiber can also be used as a coating absorbent material absorber [1]. As early as the 20th century, 70 years the application of ordinary carbon fiber to show a better absorption performance. According to the study, it is found that the absorbing properties of polyacrylonitrile fiber are related to the degree of carbonization. Therefore, polyacrylonitrile-based carbon fiber yarns were used to investigate the effects of different carbonization temperature (400 ℃, 500 ℃, 600 ℃, 718 ℃, And the composition and structure of polyacrylonitrile-based carbon fibers at 1131 ℃ and 1286 ℃, and their electrical properties were measured by their characterization of permittivity and permeability. The lattice parameters and structure of the carbon fiber were analyzed by XRD and IR. The characteristics of the dielectric constant, the magnetic permeability, the dielectric loss, the magnetic loss and the reflection loss were analyzed by the vector network analyzer. The dielectric properties of the ideal absorbing material can be obtained by the electromagnetic parameters of the polyacrylonitrile-based carbon fiber. Comprehensive multi-faceted performance at 718 ℃ carbonized carbon fiber absorbing performance is the best of the seven groups of experiments in absorbing properties, so the higher the carbonization temperature is, the better the carbon fiber is obtained.

Key words: Keywords polyacrylonitrile-based carbon fiber; absorbing properties; dielectric constant; magnetic permeability; reflection loss.

目 录

摘要： 2

Abstract： 3

1. 绪 论 5

1.1引言 5

1.2聚丙烯腈基炭纤维 5

1.2.1聚丙烯腈基炭纤维简介 5

1.2.2聚丙烯腈基碳纤维的国外发展现状 6

1.2.3聚丙烯腈基碳纤维的国内发展趋势 7

1.3吸波性能 8

2. 实验部分 10

2.1实验原料及实验仪器设备 10

2.2实验过程及表征方法