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该工艺是使熔融合金在气流喷射作用下产生雾化,同时将增强颗粒喷入雾化液流中,共同沉积到衬底上,凝固形成金属基颗粒复合材料。对工艺过程及其主要影响因素进行了研究,对复合材料的微观结构进行了观察和分析,在增量凝固概念的基础上,对喷射沉积凝固过程特点进行了讨论。试验表明:采用该工艺制取金属基颗粒复合材料,能够克服传统方法的某些不足,增强颗粒在合金基体中呈弥散分布,无凝固偏析,界面接触紧密,未观察到明显的反应过渡层。
In the process, the molten alloy is atomized by the jet of air, and the reinforced particles are sprayed into the atomized liquid stream to be co-deposited on the substrate to be solidified to form the metal-based particle composite material. The technological process and the main influencing factors were studied. The microstructure of the composite was observed and analyzed. Based on the concept of incremental solidification, the characteristics of spray deposition and solidification process were discussed. The experimental results show that the metal matrix composite can overcome some shortcomings of the traditional methods, and enhance the dispersion of the particles in the alloy matrix without coagulation segregation, close contact interface and no obvious reaction transition layer.