C/C复合材料与Invar合金钎焊接头组织性能研究
Microstructure and Mechanical Properties of C/C Composite/Invar Alloy Joints Brazed with Cu-Sn-Ti Alloy
潘苏燕 1钟志宏 2宋奎晶 1梁水保 1吴玉程2
作者信息
- 1. 合肥工业大学 材料科学与工程学院,安徽合肥 230009
- 2. 合肥工业大学 材料科学与工程学院,安徽合肥 230009;合肥工业大学 高性能铜合金材料及成形加工教育部工程研究中心,安徽合肥 230009
- 折叠
摘要
C/C复合材料是一种重要的航空航天和核结构材料,实现其与金属材料的连接可以克服其成本高和成形加工困难的问题.本研究采用Cu-Sn-Ti活性钎料钎焊C/C复合材料与Invar合金,研究了钎焊温度和保温时间对接头组织、剪切强度和断裂行为的影响.结果表明,在C/C复合材料一侧,Cu-Sn-Ti与C/C形成TiC反应层并实现连接,同时Cu-Sn-Ti会渗透进C/C复合材料中,形成凹凸不平的钉扎界面并强化接头;在Invar合金一侧,Cu-Sn-Ti与其相互溶解扩散并发生反应,形成良好界面结合;钎焊接头组织结构为Invar合金/Cu(s,s)+Fe2Ti+Ni3Ti+Ti6Sn5/Fe2Ti+CuTi+Cu3Sn/TiC+Cu(s,s)/C/C 复合材料.在钎焊温度为 930 ℃保温 10 min 时,接头剪切强度最高,为61 MPa,明显高于目前报道的C/C复合材料与金属的钎焊连接强度.
Abstract
C/C composites arc the important structure materials for aerospace and nuclear applications.Realizing the joining of C/C composite to metal materials can overcome the drawbacks of high cost and hard-to-forming of C/C composite.In this experiment,C/C composite and Invar alloy were brazed with active Cu-Sn-Ti filler alloy.The effects of brazing temperature and holding time on the microstructure,shear strength and fracture behavior of the brazed joints were investigated.The results show that on the side of C/C composite,Cu-Sn-Ti filler reacts with C/C composite to form a TiC reaction layer.In addition,Cu-Sn-Ti filler penetrates into the C/C composite,which form a zigzag interface that strengthens the joint.On the side of Invar alloy,Invar alloy dissolves into Cu-Sn-Ti to form a good interface metallurgical bonding.The interfacial microstructure of brazed joint is determined to be Invar alloy/Cu(s,s)+Fe2Ti+Ni3Ti+Ti6Sn5/Fe2Ti+CuTi+Cu3Sn/TiC+Cu(s,s)/C/C composite.The maximum shear strength of the joint of 61 MPa is obtained at the brazing temperature of 930 ℃ and the holding for 10 min,which is significantly higher than the strength reported in previous studies.
关键词
C/C复合材料/Invar合金/钎焊/微观组织/剪切强度Key words
C/C composite/Invar alloy/brazing/microstructure/shear strength引用本文复制引用
基金项目
安徽省自然科学基金(2208085ME134)
国家重点研发计划(2019YFE03100400)
出版年
2024
NETL
NSTL
万方数据