采用低纤度湿法纺丝原丝,开展“相对高”碳化温度实验,借助元素分析考察了碳纤维C、N含量的变化,通过力学性能和体密度的测试研究了高碳温度对力学性能和体密度的影响。结果表明:在1600℃前,碳含量、弹性模量的增长及氮元素的减少幅度较慢,1600～1900℃碳含量、弹性模量的增加和氮元素的减少大幅提高;在1480℃时拉伸强度出现了峰值,在1500～1700℃,随温度的提高拉伸强度小幅度降低,1900℃时,拉伸强度大幅下降;随碳化温度的提高,碳纤维的体密度逐步降低,1500℃前降低幅度小,之后快速增加。

The “relatively high” carbonization temperature experiment was carried out by using low fineness wet spinning precursors.The change of C and N contents of carbon fiber was investigated by element analysis.The influence of high carbon temperature on mechanical properties and fiber density was studied by testing mechanical properties and density.Results showed that:before 1600℃,the growth of the carbon element content,the modulus of elasticity and the reduction of nitrogen element were slow.Between 1600℃ and 1900℃,the increase of carbon content,the elastic modulus and the decrease of nitrogen increased quickly.At 1480℃ the tensile strength appeared peak value,between 1500 and 1700℃,tensile strength reduced slowly,at 1900℃the tensile strength reduced sharply.With the increase of carbonization temperature,carbon fiber density gradually reduced,before 1500℃ reduced slowly,then rapidly.