热处理方式对石墨纤维性能的影响

研究了分步热处理对石墨纤维力学性能及微观结构的影响,并采用Raman光谱分析了石墨纤维的皮芯结构程度。结果发现:在相同处理条件下,分步热处理有利于石墨纤维拉伸强度和体密度的提高,而其对弹性模量的影响则较小。分步热处理所得石墨纤维的表面石墨化程度较低,内部石墨化程度较高,其皮芯结构因子较大,说明其均质性更好一些。因此,分步热处理有利于提高石墨纤维的致密性和均质性,从而提高其拉伸强度。

Effect of Heat Treatment Style on Properties of Graphite Fibers

Effect of twice step heat treatment on mechanical properties and microstructure of graphite fibers was
studied,and the skincore degree of graphite fibers was analysed by Raman spectroscopy. The results found that twicestep heat treatment contributed to increasing the tensile strength and volume density of graphite fibers,but showed lesseffect on tensile modulus of graphite fibers. From the results of Raman spectroscopy,we found that the surface graphitization degree was lower,the inner graphitization degree was higher and the skincore gene was larger by twice step heattreatment,which meant that graphite fiber was more homogeneous. Twice step heat treatment was good for inreasingcompactness and homogeneousness of graphitize fibers,which was the reason for tensile strength increasing