借助XRD和力学测试研究了不同石墨化温度下牵伸率(0%～2.5%)对PAN基石墨纤维结构和力学性能的影响.结果表明:在2400℃、2700℃和3000℃石墨化温度下,分别采用1.25%,1.50%和2.20%的牵伸率,可获得的抗拉强度最大值相应为3.1 GPa、2.55 GPa和2.25 GPa.在相同的石墨化温度下与未牵伸的样品相比,抗拉强度提高了10%～20%.弹性模量亦随牵伸率的增大而增加,在牵伸率为2.50%时,弹性模量上升15%.同时,石墨微晶尺寸Lc(3.612nm～7.094nm)和La(12.909nm～24.400nm)及取向度逐渐增大,而d002(0.3465nm～0.341 8 nm)逐渐减小.微观结构的改善是石墨纤维抗拉强度和弹性模量提高的主要原因.
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