为优化碳纤维的石墨化工艺，利用拉曼光谱对碳纤维在石墨化过程中的结构变化进行了研究，分析比较了两种碳纤维石墨化进程的异同，结果表明：纤维在高温下发生脱氮与石墨化转变反应，脱氮反应会在石墨微晶中留下分子级空洞，氮原子脱除越多，微晶内空洞越多；石墨化转变促使石墨微晶生长、结构完善，两种纤维氮元素含量不同造成其初始结构不同，氮含量越低，纤维石墨化程度越高，氮原子脱除程度不同引起两种纤维石墨化进程存在差异，热处理温度高于1800℃时，不同初始结构碳纤维中的氮原子都脱除完全，纤维中碳化学结构趋于相同，石墨化进程出现趋同性。
To optimize the graphitization technology of carbon fibers, Raman spectroscopy was employed to characterize the microstructure of PAN-based carbon fibers during high temperature heat treatment, and graphitization process for two kinds of carbon fibers was analyzed and compared. The results show that the variety of carbon fibers' structures can be represented by Raman spectroscopy parameters, such as the Raman shifts and full width at half maximum of main D and G bands. Denitrogenation induced defects, the more the amount of escaped N, the more the defects in the graphite layers. Decfects were reduced by graphitization. The difference of the N content resulted in the structural differences between the two kinds of carbon fibers. When the heat treatment temperature was higher than 1 800 ℃, N would escape completely, and the structure for the two kinds of carbon fibers would be similar. Different initial structural carbon fibers achieved the convergence of graphitization process.
参考文献
| [1] | 李东风,王浩静,薛林兵,王心葵.PAN基碳纤维连续石墨化过程中的取向性[J].化工进展,2006(09):1101-1104,1109. |
| [2] | 常维璞,沈曾民,王理.高模量炭纤维的研制[J].新型碳材料,1998(01):28-33. |
| [3] | 张为芹,田艳红,杨延风,张西萍,沈曾民.高温热处理对炭纤维性能的影响[J].新型炭材料,2001(03):52-54,57. |
| [4] | Sadezky A;Muckenhuber H;Grothe H;Niessner R;Poschl U .Raman micro spectroscopy of soot and related carbonaceous materials: Spectral analysis and structural information[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(8):1731-1742. |
| [5] | Rzepka E.;Ponomarev EA.;Mukhopadhyay K.;Sharon M. Levy-Clement C.;Lusson A. .Raman scattering investigations of semiconducting diamond-like carbon thin films and fibers obtained from camphor[J].Carbon: An International Journal Sponsored by the American Carbon Society,1998(5/6):587-590. |
| [6] | Angoni K. .A study of highly ordered carbons by use of macroscopic and microscopic Raman spectroscopy[J].Journal of Materials Science,1998(14):3693-3698. |
| [7] | 高爱君,靳玉伟,徐樑华.氮对碳纤维石墨化的影响[J].材料研究学报,2010(02):149-153. |
| [8] | C. Mapelli;C. Castiglioni;E. Meroni;G. Zerbi .Graphite and graphitic compounds: vibrational spectra from oligomers to real materials[J].Journal of Molecular Structure,1999(0):615-620. |
| [9] | Ffabrizia Negri;Eugenio di Donato;MatteoO Ttommasini .Resonance Raman contribution to the D band of carbon materials:Modeling defects with quantum chemistry[J].The Journal of Chemical Physics,2004(24):11889-11900. |
| [10] | Fabrizia Negri;Chiara Castiglioni;Matteo Tommasini;Giuseppe Zerbi .A Computational Study of the Raman Spectra of Large Polycyclic Aromatic Hydrocarbons: Toward Molecularly Defined Subunits of Graphite[J].The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory,2002(14):3306-3317. |
| [11] | C. Castiglioni;E. Di Donato;M. Tommasini .Multi-wavelength Raman response of disordered graphitic materials: models and simulations[J].Synthetic Metals,2003(3):885-888. |
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