多孔不锈钢管与316L不锈钢的真空钎焊连接特性（英文）  

Bonding Characterization Between 316L and Porous Stainless Steel Pipes by Vacuum Brazing

作　　者：李亚宁[1] 康新婷[1] 王建[1] 汤慧萍[1] 

机构地区：[1]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《稀有金属材料与工程》2018年第2期474-478,共5页Rare Metal Materials and Engineering

摘　　要：采用镍基BNi-7焊膏为钎料,对多孔不锈钢管与316L不锈钢成功实现真空钎焊连接,并用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对接头界面组织结构进行观察和分析。结果表明,钎料对多孔不锈钢的润湿性比对316L的要好。在钎焊过程中,钎料通过毛细作用渗透到多孔不锈钢的孔隙中。焊缝的主要相是富Cr的Ni-Fe基固溶体和Ni-P金属间化合物。测试连接件的整体拉伸性能,焊接温度980℃及焊接时间15 min得到的焊接件的室温抗拉强度最大,为245 MPa。在同等条件下,延长保温时间或者提高焊接温度都不能进一步提高焊接强度。Vacuum brazing between porous stainless steel（PSS） tube and 316 L stainless steel has been performed using BNi-7 brazing paste as a filler metal. And the interface microstructure of the joint was analyzed by SEM and EDS. The results show that Ni（Cr, Fe）-P intermetallic compounds and chromium-rich nickel-iron-based solid solutions phases are the main phases in the brazing seam. The wettability of the molten braze alloy to PSS is better than that to 316 L. The molten braze filler is pulled into the pore of PSS by a capillary action during brazing. The highest tensile strength of 245 MPa is acquired from the joint brazed at 980 ℃ for 15 min. Longer processing time or higher processing temperature does not improve the joint strength further.

关 键 词：316L不锈钢 多孔不锈钢 真空钎焊 BNi-7钎料 抗拉强度 

分 类 号：TG454[金属学及工艺—焊接]