连续碳纤维增强金属基复合材料增材制造工艺

针对连续碳纤维增强金属基复合材料增材制造工艺开展系统性实验探索，研究结果表明：在对碳纤维进行表面改性后，可以实现打印过程中熔融金属基体与碳纤维的良好浸润复合；送丝速度对单道沉积路径表面质量、路径宽度及其纤维体积分数影响较大，当送丝速度为4 mm/s时，沉积路径表面质量较好，路径宽度约为1.5 mm，碳纤维体积分数约为3.43%；沉积路径搭接率对打印单层表面质量影响较大，当搭接率为50%时，单层表面质量较好；基于优化后的实验参数，实现了连续碳纤维增强金属基复合材料薄壁件以及拉伸样件的直接增材制造，薄壁件内碳纤维与金属基体形成了较好结合，而且连续碳纤维对于复合后材料的抗拉强度起到了显著增强作用.

Additive manufacturing process of continuous carbon fiber reinforced metal matrix composites

Systematic experimental exploration was carried out for the additive manufacturing process of continuous carbon fiber reinforced metal matrix composites. Results show that the molten metal matrix and the carbon fiber could be well infiltrated and compounded during the printing process after surface modification of the carbon fiber. The wire feeding speed had a great influence on the surface quality, path width and fiber volume fraction of a single deposition path. When the wire feeding speed was 4 mm/s, the surface quality of the single deposition path was good, the deposition path width was about 1.5 mm, and the volume fraction of carbon fiber was about 3.43%. The overlap rate of the deposition path had a great impact on the surface quality of the printed single layer. When the overlap rate was 50%, the surface quality of the printed single layer was relatively good. The additive manufacturing of continuous carbon fiber reinforced metal matrix composite thin-walled parts and tensile samples were realized based on the optimized experimental parameters. The carbon fiber in the thin-walled part formed a good combination with the metal matrix, and the continuous carbon fiber played a significant role in enhancing the tensile strength of the composite material.