摘要
为揭示不锈钢表面电镀锡银钎料的润湿特性,借助润湿试验炉、影像式烧结点试验仪、扫描电镜、X射线衍射仪、能谱分析仪对电镀锡银钎料的润湿行为、动态铺展过程、界面组织、物相组成及润湿界面化学元素分布进行了分析。研究表明,优先铺展的前驱膜是改善电镀锡银钎料润湿性的本质原因。润湿过程中出现的前驱膜效应,主要是试验中FB102钎剂中的硼酐引起的。电镀锡银钎料与不锈钢界面出现的Cu41Sn11相过渡层,垂直于润湿界面呈柱状向钎料内生长。随着Sn含量升高,电镀锡银钎料在不锈钢表面的润湿面积呈增大趋势;与同Sn含量(2.4%~7.2%,质量分数)的传统AgCuZnSn钎料相比,电镀锡银钎料在不锈钢表面的润湿面积提高了8.1%~12.5%。当Sn含量为7.2%时,电镀锡银钎料的润湿面积高达481mm2。电镀锡银钎料与不锈钢母材的接合界面是扩散-化合物混合型形式。
Aiming at revealing the wetting characteristic of Sn-electroplated Ag brazing alloys on the surface of 304 stainless steel,wetting test furnace,imaging-type sintering point tester,scanning electron microscope(SEM),X-ray diffractometer(XRD),energy dispersive spectrometer(EDS)were applied to analyze the wetting behavior,dynamic spreading process,interfacial microstructure,phase composition and element distribution.And the chemical elements of the interface was analyzed by line scan.The results suggested that the improved wettability of the Sn-electroplated Ag brazing alloy on stainless steel surface is intrinsically caused by the prior spreading of the wetting precursor,which is mainly induced by the B 2O 3 in FB102 flux employed during wetting experiment.Cu 41 Sn 11 compound phase,which appears at the interface of Sn-electroplated Ag brazing alloys and stainless steel,is perpendicular to the wetting interface and grow inward the brazing seam form a“column”shape.With the increase of Sn content,the wetting area of Sn-electroplated Ag brazing alloys exhibited an expanding trend on the surface of stainless steel.Compared with the traditional brazing filler metals,under the same Sn content,the wetting area of Sn-electroplated Ag brazing alloys increased about 8.1%-12.5%.When Sn content is 7.2 wt%,the wetting area of Sn-electroplated Ag brazing alloys reached the maximum value of about 481 mm 2.Our research also implied the diffusion-compound-type bonding form of the interface between Sn-electroplated Ag brazing alloys and 304 stainless steel.
作者
王星星
彭进
崔大田
孙国元
何鹏
WANG Xingxing;PENG Jin;CUI Datian;SUN Guoyuan;HE Peng(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第8期1263-1266,1275,共5页
Materials Reports
基金
国家自然科学基金(51705151)
河南省自然科学基金(162300410191)
河南省高等学校重点科研项目(17A430021)
华北水利水电大学博士科研启动基金(201704001)
关键词
304不锈钢
电镀锡银钎料
前驱膜效应
润湿面积
能谱分析
304 stainless steel
Sn-electroplated Ag brazing alloys
precursor effect
wetting area
energy spectrum analysis
