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采用真空热压烧结工艺制备了纤维长度为3mm、质量分数为3%的短碳纤维增强2024铝基复合材料。研究了热压工艺对复合材料密度、晶粒尺寸、界面结构和硬度的影响。结果表明,在450℃、50MPa下保温50min时,复合材料致密程度较高,纤维与α(Al)基体的界面结合良好,硬度达到最高。由于镀铜层提高了纤维与α(Al)基体的润湿性,镀铜短碳纤维比没有镀铜的短碳纤维对复合材料的性能提高更显著。
The short carbon fiber reinforced 2024 aluminum matrix composites with a fiber length of 3mm and a mass fraction of 3% were prepared by vacuum hot-pressing sintering. The effects of hot pressing process on the density, grain size, interface structure and hardness of the composites were studied. The results show that the composites are dense at 450 ℃ and 50MPa for 50min, and the interface between fibers and α (Al) matrix is well bonded and the hardness reaches the maximum. Due to the wettability of the copper matrix with the α (Al) matrix, the short-fiber copper-coated carbon fibers have a more significant improvement on the properties of the composites.