热压扩散法制备层压编织C_f/Al复合材料工艺研究

Fabrication Process of Laminated Woven Fiber Reinforced Aluminum Matrix Composite by Hot Pressing Diffusion

采用热压扩散法制备了层压编织Cf/Al复合材料。研究了热压温度、热压压力、热压时间等工艺参数对复合材料成形效果和致密度的影响,优化了成形工艺参数,并分析了最优工艺参数下复合材料的微观组织和界面反应。结果表明,热压温度对复合材料致密度影响最为显著。热压扩散法制备层压编织Cf/Al复合材料的最优工艺参数:热压温度为640℃、热压时间为50min、压力为15 MPa。该工艺参数下复合材料的致密度为98.5%,界面反应产物Al4C3含量约为3.6%,复合材料组织中碳纤维与铝基体结合良好,铝基体与碳纤维形成的界面为粗糙界面,界面处形成少量的杆状Al4C3。

Laminated woven fiber reinforced aluminum matrix composites were prepared by hot pressing diffusion method.Effects of hot pressing temperature,hot pressing pressure and hot pressing time on formation and relative density of the composites were analyzed.Forming parameters for preparing laminated woven fiber reinforced aluminum matrix the composition were optimized.Microstructure and interfacial reaction of the composites were analyzed based on the optimized parameters.The results show that hot pressing temperature is mainly responsible for relative density of the composite.The optimized parameters of laminated woven fiber reinforced aluminum matrix composite by hot pressing diffusion are presented as follows：temperature of 640℃,time of 50 min and the pressing pressure of 15 MPa.Based on the optimized parameters,the relative density of the composites reaches 98.5%,and the approximate content of Al4C3 is 3.6%.Compound of carbon fiber and aluminum matrix exhibits desirable.The interface between aluminum matrix and carbon fiber is rough with generation of a little rod-like Al4C3 phase.