保温时间对钎焊Al_2O_3/碳钢界面结构及结合强度的影响  

Effect of brazing time on microstructure and bonding strength of brazing interface between Al_2O_3 and carbon steel

作　　者：李炎[1] 魏世忠[1,2] 王新阳[1] 徐流杰[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省耐磨材料工程技术研究中心,河南洛阳471003

出　　处：《材料热处理学报》2015年第1期86-92,共7页Transactions of Materials and Heat Treatment

基　　金：长江学者和创新团队发展计划资助(IRT1234);河南省重点科技攻关项目(092102210011)

摘　　要：用Cu-Ti活性钎料对Al2O3陶瓷/碳钢实施钎焊,用透射电镜、扫描电镜、能谱仪和X射线衍射仪对界面微观结构进行表征,研究了钎焊温度1050℃、不同保温时间(10~40 min)对接头界面微观结构和剪切强度的影响。结果表明,保温30 min得到的钎焊接头具有较好的界面组织形态和较高的剪切强度。在此工艺条件下界面结合区有3层组成,即近陶瓷侧以Ti4Fe2O为主的反应层,近钢侧以Ti Fe2为主要析出相的扩散层,在反应层和扩散层之间为Cu固溶体+Ti4Fe2O相,各层组织比较致密,微孔缺陷较少,接头剪切强度达到99 MPa。Al2O3and carbon steel were brazed using Cu-Ti as active filler. The microstructure of the brazing zone of Al2O3 and carbon steel was characterized by means of transmission electron microscopy and scanning electron microscopy with energy dispersive spectrometer system and X-ray diffraction. The effects of brazing temperature( 1050 ℃) and time( 10-40 min) on the microstructure and the shear strength of the brazing zone were investigated. The results show that the good microstructure and higher shear strength for the brazing zone can be obtained at brazing temperature of 1050 ℃ for brazing time of 30 min. Three layers,which are reaction layer with Ti4Fe2 O close to the ceramic Al2O3,brazing alloy layer of Cu solid solution and Ti4Fe2 O,and diffusion layer with Ti Fe2 close to carbon steel,are formed at the brazing zone. The microstructure of the brazing zone is dense and its shear strength reaches 99 MPa.

关 键 词：钎焊 AL2O3陶瓷 碳钢 界面 

分 类 号：TG454[金属学及工艺—焊接]