(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 采用激光拉曼光譜對(duì)國(guó)產(chǎn)聚丙烯腈(PAN)基T300-12K炭纖維ST300和CCF300的橫截面和表面開(kāi)展微區(qū)檢測(cè)，利用Voigt函數(shù)擬合分峰，研究炭纖維表面和芯部微結(jié)構(gòu)的差異，并與日本東麗PAN基T300-12K炭纖維進(jìn)行對(duì)比。結(jié)果表明：與東麗T300炭纖維相比，國(guó)產(chǎn)炭纖維微晶結(jié)晶度較低。國(guó)產(chǎn)炭纖維ST300存在明顯的芯部和表面的結(jié)構(gòu)差異，表面有序而芯部無(wú)序；CCF300和T300炭纖維從表皮區(qū)域到芯部，微晶尺寸相對(duì)均勻。國(guó)產(chǎn)炭纖維CCF300的單絲拉伸強(qiáng)度和東麗T300的接近，分別為3.31和3.35 GPa；而ST300的拉伸強(qiáng)度和斷裂伸長(zhǎng)率偏低，說(shuō)明PAN基炭纖維芯部沿徑向的不均勻性對(duì)其單絲拉伸強(qiáng)度和斷裂伸長(zhǎng)率有不利影響；炭纖維表面有序度高于芯部的，造成拉伸強(qiáng)度偏低；在3種炭纖維中無(wú)定形碳含量越低，其彈性模量越高。
關(guān)鍵字: 聚丙烯腈基炭纖維；拉曼光譜；皮芯結(jié)構(gòu)；拉伸強(qiáng)度
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Laser Raman spectroscopy was used to characterize the microstructure difference between the cross sections and surfaces of domestic T300-12K PAN-based carbon fibers (ST300 and CCF300) with the spectra fitting by Voigt function, and the Japanese Toray PAN-based carbon fiber T300 was compared. The results show that the crystallization degree of domestic carbon fibers is lower than that of Toray T300. There is obvious skin-core structure difference in domestic carbon fiber ST300 with an ordered skin and disordered core. Compared with the crystallite size of ST300, the crystallite sizes of CCF300 and T300 are relatively uniform from skin region to core region. Domestic carbon fiber CCF300 as well as Toray T300 with nearly homogeneous structure have nearly equal tensile strengths, 3.31 and 3.35 GPa, respectively. Yet the tensile strength and strain rate of ST300 are lower, indicating that structure inhomogeneity in the transverse sections of PAN-carbon fibers have negative effect on the tensile strength. Carbon fiber with a more ordered surface than core region has lower tensile strength. Carbon fiber with lower content of amorphous carbon has higher elastic modulus.
Key words: PAN-based carbon fiber; Raman spectroscopy; skin-core structure; tensile strength
