摘要
以BAg50CuZn钎料为基材,采用电镀热扩散组合工艺制备了镀锡AgCuZnSn钎料。为了揭示镀锡银钎料的热力学特性,借助差示扫描量热仪(DSC)测定了镀锡银钎料的熔化温度,运用热分析动力学中的非等温微分法和积分法分析了镀锡银钎料的相变热力学特性,并利用金相显微镜和X射线衍射仪(XRD)对钎料熔化后润湿界面的显微组织和物相进行了分析。研究表明,随着Sn含量升高,在吸热峰镀锡银钎料由固态向液态转变的温度区间变窄,非等温微分法和积分法得到的钎料相变活化能均逐渐增大。在Sn含量为7.2%时,镀锡银钎料的相变活化能和指前因子最大,分别为555.56kJ/mol、1.41×10^(32),此时镀锡银钎料相变速率方程的表达式为:k=1.41×10^(32)exp(-5.56×10~5/RT)。7.2%Sn含量的镀锡银钎料在304不锈钢表面熔化后,润湿界面组织主要由Ag相、Cu相、CuZn相、Cu_5Zn_8相、Cu_(41)Sn_(11)相、Ag_3Sn相组成。
Silver brazing alloys with electroplating tin were prepared using the combination process of electroplating and heat diffusion based on BAg50 Cu Zn substrate. To reveal the thermodynamic properties of silver brazing alloys with electroplating tin,the melting temperature of the alloys was determined by differential scanning calorimeter（DSC）,and the phase transformation thermodynamic characteristic of silver brazing alloys were analyzed with the thermal analysis kinetics of non-isothermal differential and integral methods. The microstructure and phase composition of wetting interface between 304 stainless steel and silver brazing alloys were investigated by optical microscope and XRD,respectively. The results show that the phase transformation temperature range of silver brazing alloys from solid to liquid would be narrower with the increase of Sn content,and the phase transformation activation energy is gradually increased by a non-isothermal differential and integral method. When Sn content is 7.2%,the activation energy and pre exponential factor reach to the maximum,which are 555.56 k J/mol and 1.41×10^（32,respectively. The phase transformation rate equation of silver brazing alloys with electroplating tin is deduced as k=1.41×10^（32exp（-5.56×10^5/RT）. Silver brazing alloys with 7.2 % Sn content is melted on the surface of 304 stainless steel,and the microstructure of wetting interface are composed of Ag phase,Cu phase,Cu Zn phase,Cu_5Zn_8 phase,Cu_（41）Sn_（11） phase and Ag_3Sn phase.
作者
王星星
彭进
崔大田
杜全斌
龙伟民
Wang Xingxing Peng Jin Cui Datian Du Quanbin Long Weimin(North China University of Water Resources and Electric Power, Zhengzhou 450045, China State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第9期2583-2588,共6页
Rare Metal Materials and Engineering
基金
河南省自然科学基金(HZK170158)
河南省高校重点科研项目(17A430021)
华北水利水电大学博士基金
关键词
镀锡银钎料
熔化特性
活化能
相变速率
差示扫描量热
silver brazing alloys with electroplating tin
melting characteristic
activation energy
phase transformation rate
DSC
