基于原位合金化的SiC_p/Al复合材料等离子弧焊接  

Plasma arc welding of SiC_p/Al MMCs based on in-situ weld-alloying

作　　者：雷玉成[1,2] 李闯[1] 胡文祥[1] 谢伟峰[1] 闫久春[2] 夏晓萍[3] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]哈尔滨工业大学现代焊接生产技术国家重点实验室,黑龙江哈尔滨150001 [3]天津新港船舶重工有限责任公司,天津300456

出　　处：《江苏大学学报（自然科学版）》2012年第4期453-456,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：哈尔滨工业大学现代焊接生产技术国家重点实验室开放基金资助项目(09003);江苏科技大学先进焊接技术省级重点开放研究基金资助项目(JSAWT-0903);江苏大学科技创新团队基金资助项目(JD0805)

摘　　要：为了抑制SiCp/Al基复合材料在焊接过程中的界面反应,补充烧损元素,同时原位产生新的增强颗粒,分别以Al-Ti-Si和Al-Ti-Mg两种药芯焊丝作为填充材料,向熔池中直接添加Al,Si,Ti和Mg等金属元素,用氩氮混合等离子气对SiCp/Al基复合材料进行等离子弧原位焊接.对比分析了两种药芯材料对焊缝组织和性能的影响.结果表明:以两种药芯焊丝作为原位反应填充材料进行等离子弧原位焊接时,均可以有效抑制针状脆生相Al4C3的生成,形成了稳定熔池,得到了以TiC,TiN,AlN,Ti5Si3,MgAl2O4和细小棒状的Al3Ti等新生增强相的焊缝;焊缝组织致密结合良好,最大抗拉强度分别为232和196 MPa.To restrain interface reaction in the welding of SiCp/Al metal matrix composites（MMCs）,and to form new reinforced composites in-situ by complementing burnt metallic elements,two flux-cored wires of Al-Ti-Si and Al-Ti-Mg were filled respectively in plasma arc in-situ weld-alloying of SiCp/Al MMCs in plasma gases of argon and nitrogen.The influences of two flux-cored wires on microstructures and mechanical properties of SiCp/Al MMCs joints were investigated.The results show that the formation of needle-like harmful phases of Al4C3 are effectively inhibited by both of the two flux-cored wire fillers.The fluidity of molten pool is improved,and the stable molten pool is obtained.The mechanical properties of welded joint are effectively enhanced by the compact-grain structure and the new reinforced composites of TiC,TiN,AlN,Ti5Si3,MgAl2O4 and fine grain Al3Ti.The maximum tensile strength of welded joints are 232 MPa and 196 MPa,respectively.

关 键 词：SiCp/Al基 复合材料 等离子弧焊 原位焊接 药芯焊丝 

分 类 号：TG456.2[金属学及工艺—焊接]