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CNTs对TC4与C/C复合材料钎焊接头组织及力学性能的影响

刘多, 李星仪, 赵可汗, 宋延宇, 钟素娟, 宋晓国

刘多, 李星仪, 赵可汗, 宋延宇, 钟素娟, 宋晓国. CNTs对TC4与C/C复合材料钎焊接头组织及力学性能的影响[J]. 焊接学报, 2020, 41(4): 1-5. DOI: 10.12073/j.hjxb.20191106005
引用本文: 刘多, 李星仪, 赵可汗, 宋延宇, 钟素娟, 宋晓国. CNTs对TC4与C/C复合材料钎焊接头组织及力学性能的影响[J]. 焊接学报, 2020, 41(4): 1-5. DOI: 10.12073/j.hjxb.20191106005
LIU Duo, LI Xingyi, ZHAO Kehan, SONG Yanyu, ZHONG Sujuan, SONG Xiaoguo. Effect of CNTs on microstructure and mechanical properties of TC4 and C/C composites brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(4): 1-5. DOI: 10.12073/j.hjxb.20191106005
Citation: LIU Duo, LI Xingyi, ZHAO Kehan, SONG Yanyu, ZHONG Sujuan, SONG Xiaoguo. Effect of CNTs on microstructure and mechanical properties of TC4 and C/C composites brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(4): 1-5. DOI: 10.12073/j.hjxb.20191106005

CNTs对TC4与C/C复合材料钎焊接头组织及力学性能的影响

基金项目: 国家自然科学基金资助项目(51875130)
详细信息
    作者简介:

    刘多,1982年出生,博士,副教授,博士研究生导师;主要从事异种材料连接的科研和教学工作;发表论文40余篇;Email:liuduo0376@163.com.

  • 中图分类号: TG 454

Effect of CNTs on microstructure and mechanical properties of TC4 and C/C composites brazed joint

  • 摘要: 试验采用加入了碳纳米管(carbon nanotubes,CNTs)的AgCu4.5Ti + xCNTs (x为质量分数,%)复合钎料(简称AgCuTiC复合钎料),实现了TC4钛合金与C/C复合材料的真空钎焊连接. 通过SEM,EDS等分析手段确定了在CNTs含量为0.2%、钎焊温度为880 ℃、保温时间为20 min时接头的典型界面组织为TC4/扩散层/Ti2Cu/TiCu/Ti3Cu4/TiCu4/TiC + TiCu2 + Ag(s.s) + Cu(s.s)/Ti3Cu4/TiCu4/TiC/C/C复合材料;研究了CNTs含量对接头组织与性能的影响. 结果表明,随着CNTs含量的增加,钎缝宽度变化呈下降趋势,界面组织细化,界面中的Ti3Cu4与TiCu4脆性化合物的含量降低、TiC与TiCu2化合物的含量增加;接头的抗剪强度呈先上升后下降的趋势变化;当CNTs含量为0.4%时抗剪强度最高,达到44 MPa;CNTs的加入可使界面组织得到细化,有利于缓解钎缝中心区域与两侧母材之间存在的由于热膨胀系数不匹配而形成的较大残余应力,有效地提高了接头的抗剪强度.
    Abstract: TC4 titanium alloy was brazed to C/C composite by using AgCu4.5Ti+xCNTs (x represents weight content, %) composite filler with CNTs added (Herein after referred to as AgCuTiC composite filler) metal in vacuum. With the CNTs content was 0.2%, under the condition of 880 ℃/20 min, the typical interfacial microstructure of the brazed joint was TC4/diffusion layer/Ti2Cu/TiCu/Ti3Cu4/TiCu4/TiC+TiCu2+Ag(s.s)+Cu(s.s)/Ti3Cu4/TiCu4/TiC/C/C composites, which was determined by SEM and EDS. The effect of CNTs content on the microstructure and properties of the joint was investigated. The results indicated that with the increase of CNTs content, the width of the brazed joint decreased, the interfacial microstructure refined, the content of brittle Ti3Cu4 and TiCu4 compounds in the interface decreased, the content of TiC and TiCu2 compounds increased,the shear strength of the joint show a trend of increasing first and then decreasing. The maximal shear strength of 44 MPa was obtained with the CNTs content was 0.2%. With the addition of CNTs, the interfacial microstructure can be refined, the residual stress caused by mismatch of the thermal expansion coefficient between the central area of the joint and the substrate materials on both sides can be released, which improves the shear strength of the joint effectively.
  • 图  1   TC4/AgCuTiC /C/C复合材料钎焊接头界面组织及元素分布

    Figure  1.   Interfacial microstructure and element distribution image of TC4/AgCuTiC/C/C composites brazed joint.(a) morphology of interface; (b) element distribution of Ag; (c) element distribution of Cu; (d) element distribution of Ti; (e) element distribution of Al; (f) element distribution of C

    图  2   图1a中选定区域

    Figure  2.   Selected zone in Fig.1a. (a) magnified zone Ⅰ; (b) magnified zone Ⅱ; (c) magnified zone Ⅲ

    图  3   CNTs含量对钎焊接头界面组织形貌的影响

    Figure  3.   Effect of CNTs content on interfacial morphology of brazed joints. (a) CNTs content 0.1%; (b) CNTs content 0.2%; (c) CNTs content 0.3%; (d) CNTs content 0.4%; (e) CNTs content 0.5%

    图  4   CNTs含量对钎焊接头抗剪强度的影响

    Figure  4.   Effect of CNTs content on shear strength of brazed joints

    表  1   TC4钛合金的化学成分(质量分数,%)

    Table  1   Chemical compositions of TC4 titanium alloy

    AlVTi其它
    6.543.83余量 < 0.2
    下载: 导出CSV

    表  2   TC4和C/C复合材料的物理性能

    Table  2   Physical properties of TC4 and C/C composites

    材料密度
    ρ/(g·cm−3)
    弹性模量
    E/GPa
    抗拉强度
    Rm/MPa
    C/C复合材料1.4 ~ 1.969150
    TC4合金4.5113≥895
    下载: 导出CSV

    表  3   图2中各点元素能谱分析结果(原子分数,%)

    Table  3   Result of EDS analysis at each spot shown in Fig.2

    位置AgCuTiCAlV可能相
    A 8.3 76.5 10.8 4.4 Ti(s.s)
    B 30.4 60.6 5.5 3.5 Ti2Cu
    C 2.9 47.3 49.8 TiCu
    D 1 43.8 55.2 Ti3Cu4
    E 4.9 68.3 17.4 9.4 TiCu4
    F 92.7 5.6 2.7 Ag(s.s)
    G 1.9 55.6 40.4 2.1 Ti3Cu4
    H 1.77 35.73 28.6 33.9 TiC+TiCu2
    I 20.4 61.3 18.3 TiCu4
    J 3.8 3.7 45.3 47.2 TiC
    下载: 导出CSV
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  • 期刊类型引用(3)

    1. 赵可汗,刘多,朱海涛,陈斌,胡胜鹏,宋晓国. 钎焊温度对C/C/AgCuTi+C_f/TC4接头组织及力学性能的影响. 航空学报. 2022(04): 471-481 . 百度学术
    2. 朱强,周佳顶,赵天眸,叶茂成,王泽宇,雷玉成. 垂直取向石墨烯包覆泡沫镍复合中间层钎焊C/C复合材料与Nb的工艺及性能. 焊接学报. 2022(12): 79-83+117-118 . 本站查看
    3. 许爱平,侯继军,董俊慧,刘军,王枝梅. 基于响应面法设计的TC4钛合金激光焊复合活性剂优化. 焊接. 2021(10): 15-24+61-62 . 百度学术

    其他类型引用(5)

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出版历程
  • 收稿日期:  2019-11-05
  • 网络出版日期:  2020-07-26
  • 刊出日期:  2020-07-26

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