(1. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083；
2. 南京工業(yè)大學(xué) 膜科學(xué)技術(shù)研究所，南京 210009)
摘 要: 采用真空釬焊工藝，以Cu-Sn混合粉末壓坯為釬料，研究FeAl多孔材料與不銹鋼的焊接性能。結(jié)果表明：釬料成分和焊接工藝參數(shù)對FeAl多孔材料和434L不銹鋼的焊接性能影響顯著，焊接過程中成分為Cu-25%Sn(質(zhì)量分?jǐn)?shù))的粉末壓坯釬料在焊縫處生成Cu81Sn22 和Cu10Sn3兩種金屬間化合物，成分為Cu-10%Sn的粉末壓坯釬料在焊縫處生成(Cu，Sn)固溶體；采用Cu-10%Sn粉末壓坯為釬料，真空下經(jīng)過940 ℃保溫15 min，F(xiàn)eAl多孔材料與不銹鋼通過(Cu，Sn)連接可獲得良好的焊接接頭，得到的FeAl多孔材料與不銹鋼焊接后的抗拉強(qiáng)度為83.9 MPa，可達(dá)到FeAl多孔材料母體抗拉強(qiáng)度的90.6%；FeAl多孔材料與不銹鋼的真空釬焊機(jī)理為液態(tài)釬料對被焊母體的粘結(jié)連接及釬料元素與被焊母體元素間的互擴(kuò)散和反應(yīng)。
關(guān)鍵字: FeAl；多孔材料；真空釬焊；焊接性能
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Membrane Science and Technology Research Center, Nanjing University of Technology, Nanjing 210009, China）
Abstract:FeAl porous material and stainless steel were welded by vacuum brazing using Cu-Sn green compact as brazing filler. The weldability of FeAl porous material with stainless steel was investigated. The results show that the composition and parameters of vacuum brazing have great effect on the tensile strength of welded FeAl porous material and stainless steel. Cu81Sn22 and Cu10Sn3 intermetallics are formed in the brazing line when the filler composition is Cu-25%Sn. (Cu, Sn) solid solution is formed in the brazing line when the filler composition is Cu-10%Sn. After brazing at 940 ℃ for 15 min using Cu-10%Sn as brazing filler, the brazed FeAl porous material and stainless steel obtain the best tensile strength of 83.9 MPa, that is 90.6% of the tensile strength of FeAl porous material. The brazing mechanisms are the matrix materials joined by liquid brazing filler and the interdiffusion and reaction between the elements in filler and matrix materials.
Key words: FeAl; porous material; vacuum brazing; weldability
