论文部分内容阅读
为改善碳纤维与熔融铝合金间的润湿性、减小界面反应程度,采用化学气相沉积(CVD)法在碳纤维预制体表面沉积制备了Py C/Si C复合涂层,利用真空吸渗挤压浸渗工艺制备了Cf/Al复合材料。研究了沉积参数对碳纤维表面涂层的影响,并通过复合材料微观组织分析及材料机械性能测试来反映涂层对Cf/Al复合材料的浸渗质量和性能的影响规律。结果表明:沉积温度对涂层沉积速率影响较大,通过选择合适的沉积温度或者沉积时间,可在碳纤维表面得到厚度均匀的Py C/Si C复合涂层。碳纤维预制体表面涂层的存在可使其与基体合金润湿性良好、界面结合强度适中,形成合适的界面结合状态,有效提高浸渗质量和复合材料性能;并且当Py C涂层、Si C涂层厚度分别为0.068、0.257μm时,复合材料性能改善效果最佳。
In order to improve the wettability between carbon fiber and molten aluminum alloy and reduce the interfacial reaction, PyC / SiC composite coating was deposited on the surface of carbon fiber preform by chemical vapor deposition (CVD) Infiltration process prepared Cf / Al composites. The influence of deposition parameters on the surface coating of carbon fiber was studied. The effect of coating on the impregnation quality and properties of Cf / Al composites was analyzed by microstructure analysis and mechanical properties testing. The results show that the deposition temperature has a great influence on the deposition rate of the coating. PyC / SiC composite coating with uniform thickness can be obtained on the surface of the carbon fiber by choosing proper deposition temperature or deposition time. The presence of carbon fiber preform surface coating can make it wettability with the base alloy good, moderate interface bonding strength to form the appropriate interface bonding state, effectively improve the quality of impregnation and composite materials; and when the Py C coating, Si C When the coating thickness is 0.068,0.257μm, the composite material has the best performance improvement.