以Nb为中间层AgCuTi为钎料连接炭/炭复合材料与不锈钢  

Joining of carbon/carbon composite with stainless steel using AgCuTi as brazing alloy and Nb interlayer

作　　者：欧孝玺[1] 张福勤[1] 夏莉红[1] 梁世栋[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第3期442-447,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划(863计划)专项经费资助项目(2009AA03Z536)

摘　　要：在连接温度为900℃、保温时间10 min的条件下,以Nb为中间层,采用AgCuTi钎料对炭/炭复合材料与不锈钢进行连接。利用扫描电镜和X射线衍射对接头界面组织进行分析。实验结果表明,以Nb为中间层、AgCuTi为钎料能很好地连接炭/炭复合材料与不锈钢;连接过程中,钎料中的Ti向炭/炭复合材料界面区聚集并形成含TiC的反应层,同时,由于炭/炭复合材料内部有孔隙,部分钎料渗入炭/炭复合材料内部并与C反应,形成机械啮合和冶金结合,有利于接头力学性能的提高;炭/炭复合材料与不锈钢接头的界面结构为炭/炭复合材料/含TiC反应层/Ag(S.S)+Cu(S.S)/Nb/Ag(S.S)+Cu(S.S)+CuTi/含Fe2Ti层/不锈钢;加入中间层Nb后,残余应力得到极大的缓解,接头在室温下的四点抗弯强度最高可达到72.20 MPa。C/C composite and stainless steel were joined by using AgCuTi brazing alloy and Nb interlayer at the temperature of 900 ℃ for 10 min.The microstructure and phase composition of the joint line were investigated by scanning electron microscopy（SEM） and x-ray diffractometer（XRD）,respectively.Experiment results show that AgCuTi as brazing alloy and Nb as interlayer is a promising method for joining C/C composite and stainless steel;during joining process,a TiC reaction layer is formed at the interface of AgCuTi and C/C composite,which improves the joint strength between C/C composite and brazing alloy,some filling metal even infiltrates the C/C composite because of the existence of porosity in C/C composite,forming mechanical and metallurgical bond that improve the mechanical properties of the joint;the interface microstructure of C/C composite and stainless steel joints can be expressesd as C/C composite/TiC reaction layer/Ag（S.S）＋Cu（S.S）/Nb/Ag（S.S） ＋Cu（S.S） ＋CuTi/stainless steel reaction layer containing Fe2Ti/stainless steel.The residual stress of the joint is greatly reduced by using Nb as interlayer and the maximum four-point bending strength of joints at room temperature is 72.20 MPa.

关 键 词：炭/炭复合材料 不锈钢 AgCuTi 连接 组织结构 

分 类 号：TB332[一般工业技术—材料科学与工程]