复合熔铸法制备短碳纤维增强铝基复合材料

Short Carbon Fiber Reinforced Aluminum Matrix Composite Prepared by Composite Casting

对碳纤维进行预处理后与铝粉机械混合,用压力机制备预制块,将过热铝液与预制块混合并浇注试样。结果表明行星球磨机转速300 r/min,混制时间20 min的条件下,可获得分散度较好的预制块粉末;压强为20 MPa、保压为2.5～3 min的工艺条件下,获得了较好的预制块,并与860℃的过热铝液混合后浇注试样;经过激光刻蚀、高温灼蚀、化学镀铜预处理的短碳纤维比未经过预处理的碳纤维在铝基体中的分散效果好。

Carbon fibers after pretreatment were mixed with aluminum powder. The precast blocks were prepared by press machine, and the superheated liquid aluminum was mixed with precast blocks and then poured. The results show that： under process conditions of planetary ball mill speed of 300 r/min, the mixing time for 20 min, the good dispersity precast block powder can be obtained. Under the pressure of 20 MPa, dwell time of 2.5-3 min, the good precast blocks can be obtained, which are mixed with 860℃ superheated liquid aluminum. Then it pours samples. The dispersion of short carbon fibers after the pretreatment of laser etching, high temperature hot corrosion and chemical copper plating in A1 matrix is better than that of carbon fibers without pretreatment in aluminum matrix.