【摘要】 以Ti-Si混合粉末作为填充材料,采用氮氩混合等离子气体对SiCp/Al基复合材料进行等离子弧原位焊接,分析SiCp/Al基复合材料的焊接性。结果表明,填充Ti-Si混合粉末进行等离子弧原位焊接时接头组织致密,结合较好,焊缝组织中生成了新的增强颗粒,未发现明显的针状相生成,从而有效地提高了接头的力学性能。力学性能试验表明,采用Ti-Si混合粉末进行等离子弧原位焊接所获得的抗拉强度为232.3MPa。此外探讨了焊接接头中气孔形成的机制以及应采取的相应措施。更多还原

【Abstract】 In order to analyze weldability of SiC particle reinforced aluminum metal matrix composites(SiCp/Al MMCs), plasma arc "in-situ" welding of SiCp/Al MMCs are carried out using argon-nitrogen mixture as plasma gases and Ti-Si mixed powder as "in-situ" welded material. The results show that the dense metallurgical joining with obscure interface could be acquired by adding Ti-Si mixed powder into the pool and new composite reinforced are produced in the weld, and the needle-like phases are not found yet, ensuring the quality of joints. The mechanical testing results show that the maximum tensile strength obtained with Ti-Si mixed powder as "in-situ" material are 232.3 MPa.Furthermore the forming mechanism of porosity in welded joint and the corresponding measures are discussed.更多还原