炭化温度对中间相沥青基炭纤维性能的影响

The influence of carbonization temperatures on mesophase pitch-based carbon fibers

对中间相沥青基炭纤维在炭化过程中结构与性能的变化规律进行了研究。结果表明,随着炭化温度的升高,炭纤维的拉伸强度和模量均呈上升趋势,炭纤维的d002呈现下降趋势,而La和Lc呈现上升趋势。对炭纤维的电磁参数测试结果表明,炭化温度对炭纤维的介电常数有明显的影响,但对磁导率影响不大,不同炭化温度的中间相沥青基炭纤维的复介电常数实部随电磁场频率的降低而升高,其介电损耗也随着炭化温度的升高而呈现上升趋势。

The influence of varying the carbonization temperatures on the structure and properties of mesophase pitch-based carbon fibers has been studied. It was found that with increasing carbonization temperature, the tensile strength and modulus of AR pitch carbon fibers increased whilst the interlayer spacing d002 decreased, and the values of crystallite size parallel （La） and perpendicular （Lc） to the carbon layers increased. Investigation of the electromagnetic parameters by vector network analysis （VNA） indicated that varying the carbonization temperatures had a greater effect on the permittivity than on the permeability. Decreasing the frequency of the electromagnetic field increased the real part ε′ of the complex permittivity of mesophase pitch based carbon fibers prepared at different carbonization temperatures. The dielectric loss tan （δε） increased when the carbonization temperature increased.