Ti/Nb/Cu作缓冲层的TiC金属陶瓷/304不锈钢扩散连接
采用Ti/Nb/Cu复合中间层在连接温度为925℃、保温时间20min、焊接压力8MPa的条件下对TiC金属陶瓷和304不锈钢进行真空扩散连接。通过光学金相显微镜(OM)、扫描电镜(SEM)、能谱(EDS)及X射线衍射(XRD)分析观察接头微观组织、断口形貌、反应界面元素分布、断面的物相组成。结果表明:在TiC金属陶瓷和304不锈钢之间形成一个明显的转变过渡区,界面反应产物主要为[Ti,Nb]固溶体+Ti+NbTi4,Nb和剩余Cu+[Cu,Fe]固溶体+Cr。接头抗剪强度达到84.6MPa,断裂发生在TiC和Ti之间的位于TiC上的扩散反应层上。Nb对接头残余应力的改善起到关键作用,界面强度...
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Published in | 材料工程 no. 12; pp. 60 - 65 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
重庆大学材料科学与工程学院,重庆,400044
2014
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Subjects | |
Online Access | Get full text |
ISSN | 1001-4381 1001-4381 |
DOI | 10.11868/j.issn.1001-4381.2014.12.011 |
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Summary: | 采用Ti/Nb/Cu复合中间层在连接温度为925℃、保温时间20min、焊接压力8MPa的条件下对TiC金属陶瓷和304不锈钢进行真空扩散连接。通过光学金相显微镜(OM)、扫描电镜(SEM)、能谱(EDS)及X射线衍射(XRD)分析观察接头微观组织、断口形貌、反应界面元素分布、断面的物相组成。结果表明:在TiC金属陶瓷和304不锈钢之间形成一个明显的转变过渡区,界面反应产物主要为[Ti,Nb]固溶体+Ti+NbTi4,Nb和剩余Cu+[Cu,Fe]固溶体+Cr。接头抗剪强度达到84.6MPa,断裂发生在TiC和Ti之间的位于TiC上的扩散反应层上。Nb对接头残余应力的改善起到关键作用,界面强度高于因残余应力作用而弱化了的陶瓷基体强度。 |
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Bibliography: | 11-1800/TB LI Jia,SHENG Guang-min (College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China) diffusion bonding ;TiC cermet ; Ti/Nb/Cu multi-interlayer ; microstructure ; fracture The vacuum diffusion bonding of TiC cermet and 304 stainless steel (304SS) was conducted with Ti/Nb/Cu multi-interlayer at 925℃ for 20min with a pressure of 8MPa. The microstructures, fracture morphology elemental distribution of reaction interface and phase composition of fracture sur- face were investigated with optical microscopy(OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results show that an obvious transi- tion zone is formed between TiC cermet and 304SS, and the interface products are [Ti,Nb] solid solu- tion+Ti+NbTi4 ,Nb, remnant Cu+[Cu,Fe] solid solution+Cr. The shear strength of joints is up to 84.6MPa. The failure mostly occurs in diffusion reaction layer between TiC and Ti within TiC cer met. Nb interlayer plays a major role |
ISSN: | 1001-4381 1001-4381 |
DOI: | 10.11868/j.issn.1001-4381.2014.12.011 |