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

作　　者：潘苏燕 钟志宏[1,2] 宋奎晶[1] 梁水保 吴玉程[1,2] Pan Suyan;Zhong Zhihong;Song Kuijing;Liang Shuibao;Wu Yucheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Engineering Research Center of High Performance Copper Alloy Materials and Processing,Ministry of Education,Hefei University of Technology,Hefei 230009,China)

机构地区：[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

出　　处：《稀有金属材料与工程》2024年第8期2232-2240,共9页Rare Metal Materials and Engineering

基　　金：安徽省自然科学基金(2208085ME134);国家重点研发计划(2019YFE03100400)。

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)+Fe_(2)Ti+Ni_(3)Ti+Ti_(6)Sn_(5)/Fe_(2)Ti+CuTi+Cu_(3)Sn/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。C/C composites are 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)+Fe_(2)Ti+Ni_(3)Ti+Ti_(6)Sn_(5)/Fe_(2)Ti+CuTi+Cu_(3)Sn/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 

分 类 号：TG454[金属学及工艺—焊接]