TC4合金与碳纤维增强ZrB2-SiC陶瓷钎焊接头的微观结构与力学性能
作者:
作者单位:

1.安徽机电职业技术学院航空与材料学院,芜湖 241000;2.安徽工程大学机械与汽车工程学院,芜湖 241000;3.中国航空无线电电子研究所工程部,上海 200241

作者简介:

王微,1984年生,硕士,讲师,主要研究方向为复合材料、材料连接与加工技术。E-mail: ahjdww@163.com

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基金项目:

安徽省教育厅自然科学重点项目(KJ2018A0860);安徽省质量工程项目(2018kfk108、2019zyk39);安徽省教育厅高校优秀青年人才支持计划重点项目(gxyqzd2020059)


Microstructure and Mechanical Properties of Carbon Fiber Reinforced ZrB2-SiC Brazed Joints With TC4 Alloy
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Affiliation:

1.School of Aviation and Materials, Anhui Technical College of Mechanical and Electrical Engineering, Wuhu 241000;2.School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000;3.China National Aeronautical Radio Electronics Research Institute, Engineering Department, Shanghai 200241

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    摘要:

    采用Ag-28Cu钎料对碳纤维增强ZrB2-SiC复合陶瓷与TC4合金真空钎焊。利用扫描电子显微镜、能谱分析仪、力学万能试验机研究钎焊保温时间对钎焊接头界面微观结构与剪切强度的影响。结果表明:碳纤维增强ZrB2-SiC/Ag-28Cu /TC4钎焊接头结合良好,典型接头相组成如下:TC4/TiC+ TiCu/ Ti2Cu/TiCu/Cu(s,s) /Ag(s,s)/Ti5Si3/TiC / ZrB2-SiC-C。不同的保温时间未改变钎焊接头的相组成,但对于接头界面微观形貌、焊缝厚度及组成相的数量有影响。随钎焊保温时间增加,焊缝中心Ag(s,s)、Cu(s,s)区域逐渐减小,近TC4侧反应中Ti-Cu反应层厚度逐渐增加,其中保温30 min焊缝厚度最厚为70 μm、焊缝中心区域厚度为45 μm。室温平均剪切强度随保温时间增加,先增加后降低,在保温时间20 min时,剪切强度最大为34 MPa。

    Abstract:

    Carbon fiber reinforced ZrB2-SiC composite ceramic and TC4 alloy were connected by using Ag-28Cu filler in the vacuum brazing furnace. Scanning electron microscope,energy dispersion spectrometer and mechanical universal testing machine were used to study the effect of brazing holding time on the microstructure and shear strength of the brazed joint interface. The results show that the carbon fiber reinforced ZrB2-SiC composite ceramic / Ag-28Cu / TC4 alloy joints are well bonded. The typical joints are composed as following: TC4/TiC+TiCu/Ti2Cu/TiCu/Cu(s,s)/Ag(s,s)/Ti5Si3/TiC/ZrB2-SiC-C. Different holding times have not changed the phase composition of the brazed joints. However, it has an influence on the microstructure of the joints interface, the thickness of the weld and the number of constituent phases. With the increase of brazing holding time, the Ag (s, s) and Cu (s, s) areas in the center of the weld gradually decrease,the thickness of the Ti-Cu reaction layer gradually increased in the TC4 side reaction.The maximum thickness of the weld is 70 μm and the thickness of the central area of the weld is 45 μm when holding for 30 min. The average shear strength at room temperature increased first and then decreased with the increase of holding time and the maximum shear strength is 34 MPa at 810 ℃ with 20 min holding time.

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王微,吴鹏,李振亚. TC4合金与碳纤维增强ZrB2-SiC陶瓷钎焊接头的微观结构与力学性能[J].宇航材料工艺,2021,51(1):42-49.

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  • 收稿日期:2020-06-11
  • 最后修改日期:2021-01-07
  • 录用日期:2020-06-15
  • 在线发布日期: 2021-02-19