以2D针刺炭毡为预制体,天然气为炭源前驱体,无稀释气体,绝对压力为10kPa,沉积温度为1100℃的工艺条件下,通过新型等温化学气相沉积工艺(ICVI),控制气体滞留时间分别为0.01, 0.02, 0.03s.研究在此超短气体滞留时间下C/C复合材料的致密化过程及密度分布,并采用偏光显微镜(PLM),扫描电子显微镜(SEM)观察其微观组织结构形貌.结果表明:在0.01s的气体滞留时间下,150h的渗透时间内可以制备出表观密度达到1.75g/cm3以上,密度呈现内高外低特点的C/C复合材料,其组织结构为中织构(MT)和高织构(HT)的双层织构,MT只在纤维表面存在且厚度小于2μm,其他均为HT组织.
参考文献
| [1] | 李贺军.炭/炭复合材料[J].新型炭材料,2001(02):79-80. |
| [2] | GOLECKI I .Rapid vapor-phase densification of refractory composites[J].Materials Science and Engineering,1997,20(02):37-124. |
| [3] | 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. |
| [4] | Benzinger W.;Huttinger KJ. .Chemical vapor infiltration of pyrocarbon - II. The influence of increasing methane partial pressure at constant total pressure on infiltration rate and degree of pore filling[J].Carbon: An International Journal Sponsored by the American Carbon Society,1998(7/8):1033-1042. |
| [5] | Benzinger W.;Huttinger K.J. .Chemical vapor infiltration of pyrocarbon-III :the influence of increasing methane partial pressure at increasing total pressure on infiltration rate and degree of pore filling[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(2):181-193. |
| [6] | Hu ZJ.;Huttinger KJ.;Schoch G. .Chemistry and kinetics of chemical vapor infiltration of pyrocarbon - VII: infiltration of capillaries of equal size[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(7):1059-1065. |
| [7] | Zhang WG.;Hu ZJ.;Huttinger KJ. .Chemical vapor infiltration of carbon fiber felt: optimization of densification and carbon microstructure[J].Carbon: An International Journal Sponsored by the American Carbon Society,2002(14):2529-2545. |
| [8] | W.G. Zhang;K.J. Huttinger .Densification of a 2D carbon fiber preform by isothermal, isobaric CVI: Kinetics and carbon microstructure[J].Carbon: An International Journal Sponsored by the American Carbon Society,2003(12):2325-2337. |
| [9] | 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. |
| [10] | 徐国忠,李贺军,刘皓,李妙玲,王闯,陈拂晓.改进ICVI工艺制备C/C复合材料的基体织构研究[J].无机材料学报,2008(01):175-179. |
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