低成本炭/炭复合材料的研究进展——化学液相沉积工艺(英文)

Research of low-cost preparation of carbon/carbon composites-Chemical liquid deposition process

简述了制备炭/炭复合材料的新工艺——化学液相沉积(CLD)的沉积原理。利用工业燃油作为裂解炭前驱体,炭纤维毡作为增强体,通过工艺参数控制得到低成本炭/炭复合材料。CLD工艺所得材料沉积密度1.6 g/cm3,轴向压缩强度92 MPa,等离子烧蚀率0.06 mm/s,与CVD工艺所得材料相近。与常规CVD工艺相比,CLD工艺制备的C/C复合材料在制备时间上缩短了4/5,致密速率快5倍多。所得基体裂解炭为粗糙层与光滑层结构(大部分为粗糙层结构)。基体炭与炭纤维接合界面适中,且呈洋葱状分布,从而材料具有一定韧性。

The densification mechanism of chemical liquid deposition （CLD） process was introduced. Taking industrial fuel as the precursor for carbon matrix and carbon fiber felt as the reinforcement, a low-cost C/C composite （C/C） was prepared. The resuits show that the properties of CLD C/C are the same as those of CVD C/C, i.e. the bulk density is up to 1.6 g/cm^3 , the axial compressive strength can be up to 92 MPa, and the plasma ablation rate can be less than 0.06 mm/s. Compared with CVD process, the densification rate of CLD process can be increased about 5 times. Consequently, the deposition period can be shortened about 4/5. CLD carbon matrix includes rough laminar pyrocarbon （ RL Pyc） and smooth laminar pyrocarbon （ SL Pyc） （ mainly RL Pyc）. The carbon matrix with an onion structure bonds with carbon fiber moderately, that is to say, the matrix/fiber interface of CLD C/C is better. So it can be predicated that the mechanical properties of CLD C/C can be improved.