以国产高强中模碳纤维为原料,经不同的高温热处理过程制备出力学性能不同的高模量碳纤维,利用INSTRON万能材料试验机、扫描电子显微镜、拉曼光谱和X射线衍射仪对所制碳纤维的力学性能、表面形貌、结构组成进行了分析和表征,重点研究了碳纤维杨氏模量提高过程中微观结构的变化,并将两者进行了关联。结果表明,高强中模碳纤维的高模化历程强烈依赖于高温热处理过程。碳纤维杨氏模量与表面结构密切相关,且随着表面石墨化程度的提高而增加。在碳纤维高模化转变过程中,表面微晶尺寸变大、结晶度变高、取向度变高。杨氏模量与微晶尺寸、结晶度存在线性关系,但其增加幅度随着取向度的提高而趋缓。
High-modulus carbon fiber (HMCF) with different mechanical performance were produced from domestic high-strength-high-modulus carbon fiber (HSMMCF) through high temperature heat-treatment process with different process parameters.Mechanical performance,surface morphology and microstructure on the surface of resulting high modulus carbon fibers were studied using INSTRON universal testing machine,scanning electronic microscope (SEM),Raman spectra and X-ray diffraction analysis (XRD).The change of microstructure during the increase of Young's modulus of carbon fiber,and respectively correlated modulus with various of parameters of microstructure were mainly discussed.The results showed that the transforming of HSMMCF into HMCF highly was depend on high temperature heat-treatment process.Young's modulus was strongly correlate to the surface structure of carbon fiber,as it increasing with the rise of degree of graphitization on the surface and had linear relationship with R′s value.Also Young's modulus increased with the increase of crystallite size,crystallinity and the rise of degree of orientation,while there's linear relationship between Young's modulus and crystallite size as well as crystallinity.But the upward tendency was slowed with the increase of degree of orientation.
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基金资助
国家高科技研究发展计划(863计划)(2015AA03A202)资助
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