摘要
采用Ag-Cu-Ti活性钎料,通过真空钎焊方法进行了SiC陶瓷与316L不锈钢的连接,研究了接头的界面组织、特征点成分和物相,并探讨了钎焊温度(800~930℃)、保温时间(0~30 min)对接头界面组织和连接强度的影响。结果表明,SiC陶瓷与316L不锈钢钎焊抗剪断口均发生在SiC陶瓷与钎料连接界面处,由于活性元素Ti的作用,在陶瓷与钎料的界面处形成了连续的反应层,反应生成了Ti C和Ti5Si3;在316L不锈钢与钎料的界面处,生成了Fe-Ti化合物和Cu-Ti化合物。随着钎焊温度升高及保温时间延长,接头强度均呈现出一个峰值,在温度为900℃,保温20 min的工艺条件下可获得最大接头抗剪强度。
The SiC rod( Ф15 mm × 15 mm) and 316 L stainless steel disc( Ф15 mm × 5 mm) were firmly jointed by vacuum brazing with AgCuTi alloy filler. The influence of the brazing temperature,holding time and interface properties on the phase-structures and bonding strength at the joints was investigated with X-ray diffraction,energy dispersive spectroscopy,scanning electron microscopy and mechanical tools. The results show that the brazing temperature,holding time and interface properties all had a major impact. For example,the shear fractures often occurred at the SiC/alloy-filler interface,where highly active Ti induced formation of a continuous reaction layer,mainly comprising Ti C and Ti5 Si3 phases; in contrast,at the interface of stainless steel and alloy-filler,the intermetallics of Fe-Ti and Cu-Ti formed. Brazed at 900℃ for a holding time of 20 min,the joints displayed the strongest shear strength.
作者
欧婷
张德库
王康
王克鸿
Ou Ting;Zhang Deku;Wang Kang;Wang Kehong(Nanjing University of Science and Technology,School of Materials Science and Engineering,Nanfing 210094,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2018年第10期846-851,共6页
Chinese Journal of Vacuum Science and Technology
基金
国防科技创新特区资助项目(17-H863-03-ZD-007-004-03)