低成本炭/炭复合材料的研究进展——化学液相沉积工艺

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。

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

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 results 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/cm3,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.