采用6K的预氧丝和炭纤维制备预制体，通过化学气相渗积制备炭/炭复合材料。通过偏光显微镜、拉曼光谱、纳米硬度和三点弯曲等手段研究其微观结构和力学性能。结果表明，预氧丝复合材料的基体为暗层和粗糙层炭，厚度分别为1.4ˉ2.6μm和10.2ˉ11.6μm；而炭纤维复合材料的基体为光滑层和粗糙层炭，厚度分别为8μm和4.4μm；预氧丝纤维的模量和硬度明显小于炭纤维，同时基体的模量和硬度随消光角的增加而降低；低模量的基体和纤维导致预氧丝复合材料的拉伸强度、拉伸模量、弯曲强度和模量分别降低了14.5%ˉ24.2%、9.7%ˉ19.8%、7.3%ˉ15.4%和15.1%ˉ18.6%；但其韧性指数却提高了224%ˉ235%，这是高含量的粗糙层炭和纤维的石墨化收缩所致；同时提出了一个三单元复合模型用来模拟复合材料的拉伸模量，模拟误差小于9.9%。
Two carbonized oxidized polyacrylonitrile fiber ( OPF) felts and one polyacrylonitrileˉbased carbon fiber ( CF) felt were used as preforms to prepare two kinds of carbon/carbon composites by chemical vapor infiltration,and the effect of fiber type on the microstructure and mechanical properties of the composites were investigated. The microstructure was characterized bypolarˉ ized light microscopy and Raman spectroscopy and the mechanical properties were characterized by nanoindentation and threeˉpoint bend tests. The two carbonized OPFs are surrounded by a darklaminar layer about 1. 4ˉ2. 6 μm thick followed by a rough laminar layer of about 10. 2ˉ11. 6 μm, while the CFs are surrounded by a smooth laminar layer about 8. 8μm thick and arough laminar layer of about 4. 4 μm. Nanoindentation indicates that the modulus and hardness of the carbonized OPFsare obviously lower than those of the CFs, and the modulus and hardness of the matrix decrease with increasing extinction angle. The low modulus of the matrix and the OPFsresult in a decrease of the tensile and flexural strength by about 14. 5%ˉ24. 2% and 7. 3%ˉ15. 4% and a decrease of the tensile and flexural modulus by about 9. 7%ˉ19. 8% and 15. 1%ˉ18. 6%, respectively, for the OPFˉderived composites compared with the CFˉderived composites. However, for the OPFˉderived composites the ductility factor increases by about 224%ˉ235% beˉ cause of the high content of rough laminarcarbon and the obvious shrinkage of the OPFs after graphitization. Meanwhile, a modelinˉ volving the three components in the composites is proposed to predict their tensile modulus, which shows deviations between experiˉ mental and predicted results below 9. 9%.
参考文献
| [1] | Soydan Ozcan;Jale Tezcan;Peter Filip .Microstructure and elastic properties of individual components of C/C composites[J].Carbon,2009(15):3403-3414. |
| [2] | P. Delhaes .Chemical vapor deposition and infiltration processes of carbon materials[J].Carbon: An International Journal Sponsored by the American Carbon Society,2002(5):641-657. |
| [3] | 孙超,张博,杨晓光,许正辉,宋怀河,花双平,陈晓红.原位聚合增密次数对C/C复合材料性能的影响[J].新型炭材料,2012(01):49-54. |
| [4] | Narayana Birakayala;Edward A. Evans .A reduced reaction model for carbon CVD/CVI processes[J].Carbon: An International Journal Sponsored by the American Carbon Society,2002(5):675-683. |
| [5] | Bruneton E.;Oberlin A.;Narcy B. .CARBON-CARBON COMPOSITES PREPARED BY A RAPID DENSIFICATION PROCESS I - SYNTHESIS AND PHYSICO-CHEMICAL DATA[J].Carbon: An International Journal Sponsored by the American Carbon Society,1997(10/11):1593-1598. |
| [6] | 温月芳,曹霞,杨永岗,李辉,郭建强,刘朗.PAN预氧化纤维的炭化过程[J].新型炭材料,2008(02):121-126. |
| [7] | Jia L;Cui H;Li H J et al.Invenstigation on property and figuˉ ration for two kind of needling fiber[J].Journal of Solid Rocket Technology,2010,33(02):222-228. |
| [8] | Manocha LM.;Manocha SM.;Bhatt H. .DEVELOPMENT OF CARBON/CARBON COMPOSITES BY CO-CARBONIZATION OF PHENOLIC RESIN AND OXIDISED PAN FIBERS[J].Carbon: An International Journal Sponsored by the American Carbon Society,1996(7):841-849. |
| [9] | Tse-Hao Ko;Wen-Shyong Kuo;Ying-Huang Chang .Influence of carbon-fiber felts on the development of carbon-carbon composites[J].Composites. Part A, Applied science and manufacturing,2003(5):393-401. |
| [10] | Tengfei Chen;Weiping Gong;Genshan Liu .Effects of fiber-types on braking behavior of carbon-carbon composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):73-78. |
| [11] | SU Junˉming;CUI Hong;LI Ruiˉzhen et al.Stucture and propreties of the new needled carbon cloth C/C composite[J].NEW CARBON MATERIALS,2000,15(02):11-15. |
| [12] | M.S.A. Rahaman;A.F. Ismail;A. Mustafa .A review of heat treatment on polyacrylonitrile fiber[J].Polymer Degradation and Stability,2007(8):1421-1432. |
| [13] | Olry P;Coupe D;Duval R et al.Hybrid yarn for the fabricaˉ tion of fibre preforms of composite parts,and method for its preparation[P].US patent 6051313,2000,2000. |
| [14] | Dupel P.;Pailler R.;Bourrat X. .STRUCTURE OF PYROCARBON INFILTRATED BY PULSE-CVI[J].Carbon: An International Journal Sponsored by the American Carbon Society,1995(9):1193-1204. |
| [15] | Marx DT;Riester L .Mechanical properties of carbon-carbon composite components determined using nanoindentation[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(11):1679-1684. |
| [16] | Guellali M;Oberacker R;Hoffmann MJ .Influence of the matrix microstructure on the mechanical properties of CVI-infiltrated carbon fiber felts[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(9):1954-1960. |
| [17] | Cuesta A;Dahmelincourt P;Laureyns J et al.Raman microˉprobe studies on carbon materials[J].CARBON,1994,32(08):1523-1532. |
| [18] | Bourrat X.;Fillion A.;Naslain R.;Chollon G.;Brendle M. .Regenerative laminar pyrocarbon[J].Carbon: An International Journal Sponsored by the American Carbon Society,2002(15):2931-2945. |
| [19] | Coffin L F .Structureˉproperty relations for pyrolytic graphite[J].Journal of the American Ceramic Society,1964,47(10):473-478. |
| [20] | Benzinger W.;Huttinger K.J. .Chemistry and kinetics of chemical vapor infiltration of pyrocarbon-VI. Mechanical and structural properties of infiltrated carbon fiber felt[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(8):1311-1322. |
| [21] | Xu GZ;Li HJ;Bai RC;Wei H;Zhai YQ .Influence of the matrix texture on the fracture behavior of 2D carbon/carbon composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):319-323. |
| [22] | B. Reznik;M. Guellali;D. Gerthsen .Microstructure and mechanical properties of carbon-carbon composites with multilayered pyrocarbon matrix[J].Materials Letters,2002(1/2):14-19. |
| [23] | Yujie Hu;Ruiying Luo;Yunfeng Zhang;Jincao Zhang;Jinsong Li .Effect of preform density on densification rate and mechanical properties of carbon/carbon composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(3):797-801. |
| [24] | Fitzer E;Huttner W .Structure and strength of carbon/carbon composites[J].Journal of Physics D:Applied Physics,1981,14(03):347-371. |
| [25] | Gu Z L.Mechanics of Short Fiber Composites[M].Defense Industry Press,1987:130-132. |
| [26] | Benzinger W.;Huttinger K.J. .Chemistry and kinetics of chemical vapor infiltration of pyrocarbon-IV. Investigation of methane/hydrogen mixtures[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(6):931-940. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%