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AgCu+SiC复合钎料中SiC含量对Al2O3/TC4接头组织和性能的影响
李淳1, 郑祖金1, 亓钧雷2, 冯吉才1, 曹健1
1.哈尔滨工业大学 先进焊接与连接国家重点实验室, 哈尔滨 150001;2.哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001
摘要:
采用AgCu+SiC复合钎料钎焊连接了Al2O3陶瓷与TC4钛合金,研究了SiC增强相含量与钎焊温度对接头组织与性能的影响,发现接头的典型组织为Al2O3陶瓷/Ti3Cu3O/Ag基固溶体+Cu基固溶体+TiC+Ti5Si3/TiCu2/TiCu/TC4钛合金. 陶瓷一侧的反应层随着钎焊温度的升高而变厚,随着增强相含量的增加而变薄,当增强相含量较少时,反应产物呈弥散分布,当增强含量较多时,反应产物发生了团聚现象. 钎焊的反应产物随着钎焊温度的升高由团聚分布变为弥散分布. 接头的抗剪强度随着增强相的含量与钎焊温度的升高先增加后降低,当增强相含量为3%(质量分数),钎焊温度为870℃时达到最大,为98 MPa.
关键词:  氧化铝陶瓷  钛合金  钎焊  微观组织  接头强度
DOI:10.12073/j.hjxb.2019400002-y
分类号:TG454
基金项目:国家自然科学基金青年项目(51805114);国家自然科学基金航天联合基金项目(U1737205);国家自然科学基金优秀青年科学基金项目(51622503)
Effect of the SiC content in the Ag-Cu+SiC composite brazing filler on the microstructure and mechanical properties of the Al2O3/TC4 brazing joint
LI Chun1, ZHENG Zujin1, QI Junlei2, FENG Jicai1, CAO Jian1
1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract:
The joining between Al2O3 and TC4 titanium alloy was realised using Ag-Cu+SiC composite filler metal. The effects of the mass fraction of SiC and the brazing temperature on microstructure and mechanical properties of the joint were investigated. It was found that the typical microstructure of the joint is Al2O3/Ti3Cu3O/Ag solid solution + Cu solid solution +TiC+Ti5Si3/TiCu2/TiCu/TC4. The thickness of the reaction layer adjacent to the ceramic is increasing with the rising of the temperature and is decreasing with the growing mass fraction of the SiC. For the joint with a small amount of SiC, the reaction products distribute uniformly, while for the joint with a large amount of SiC, the reaction products tends to agglomerate. Reaction products of brazing change from agglomerated distribution to uniform distribution with the increase of brazing temperature. The shear strength of the joint first increases and then decreases with the increase of the brazing temperature and the SiC mass fraction. The highest shear strength of the joint reaches 98 MPa when the mass fraction of the strengthening phase is 3% and the brazing temperature is 870℃.
Key words:  alumina ceramics  titanium alloy  brazing  microstructure  strength of the joint