采用(Ti/Ni/Cu)f多层箔钎焊C/C复合材料与TiAl合金

doi:10.3901/JME.2018.09.108

机械工程学报 ›› 2018, Vol. 54 ›› Issue (9): 108-114.doi: 10.3901/JME.2018.09.108

• 特邀专栏：航天先进制造技术专栏 • 上一篇下一篇

采用(Ti/Ni/Cu)_f多层箔钎焊C/C复合材料与TiAl合金

曹健, 贺宗晶, 亓钧雷, 王厚勤, 冯吉才

哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨 150001

收稿日期:2017-07-15 修回日期:2017-11-27 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: 冯吉才(通信作者),男,1958年出生,博士,教授,博士研究生导师。主要研究方向为新材料及异种材料的扩散焊、钎焊、电子束、搅拌摩擦焊接等方面的基础和应用。E-mail:fengjc@hit.edu.cn
作者简介:曹健,男,1981年出生,博士,教授,博士研究生导师。主要研究方向为异种材料的连接机理与性能优化。E-mail:cao_jian@hit.edu.cn
基金资助:
国家自然科学基金资助项目（U1537206，51622503）。

Brazing of C/C Composite to TiAl Alloy Using (Ti/Ni/Cu)_f Multi-foil Filler

CAO Jian, HE Zongjing, QI Junlei, WANG Houqin, FENG Jicai

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001

Received:2017-07-15 Revised:2017-11-27 Online:2018-05-05 Published:2018-05-05

摘要/Abstract

摘要： 采用（Ti/Ni/Cu）_f多层箔状钎料进行C/C复合材料与TiAl合金的钎焊，实现了良好的界面结合，保证了接头的高温力学性能。研究结果表明：钎焊过程中，首先在Ti/Ni界面处接触反应形成低熔共晶液相，Cu元素的溶解促进了钎料的完全熔化和扩散，接头组织一般为C/C/TiC/Al₂（Cu，Ni） Ti₃C/Ti （Cu，Ni）+Al （Cu，Ni）₂Ti/Al （Cu，Ni） Ti+Ti₃Al/TiAl，Ti （Cu，Ni）基体相和球状弥散分布的Al （Cu，Ni）₂Ti相是钎缝的主要组成部分。当钎焊温度较低或者保温时间较短时，由于钎缝中生成了大量的脆性Ti₂Ni相，降低了接头的力学性能；当钎焊温度较高或保温时间较长时，C/C复合材料母材界面处开裂，且TiC层从母材脱落，也削弱了接头的抗剪强度。当钎焊温度为980℃，保温时间为10 min时，C/C复合材料与TiAl合金的接头室温抗剪强度达到最大值18 MPa，600℃时接头的高温抗剪强度达到22 MPa。

关键词: C/C复合材料, TiAl合金, 复合钎料, 界面结构, 力学性能, 钎焊

Abstract: C/C composite is brazed to TiAl alloy using (Ti/Ni/Cu)_f multi-foil filler. The brazing joint displayed reliable interface bonding and excellent mechanical properties under high temperature. The research showed during brazing process, low-melting-point eutectic liquid-phase structure is firstly formed through the contact reaction at the Ti/Ni interface, then complete melt and diffusion of the filler occurred afterwards with Cu element dissolving. General microstructure of the joint show as follows:C/C/TiC/Al₂(Cu,Ni)Ti₃C/Ti(Cu,Ni)+Al(Cu,Ni)₂Ti/Al(Cu,Ni)Ti+Ti₃Al/TiAl. The Ti(Cu,Ni) matrix phase and spheroidal dispersion of the Al(Cu,Ni)₂Ti phase constitute the main components of the joint. A mass of fragile Ti₂Ni phase caused by lower brazing temperature and shorter holding time reduced mechanical property of the joint. Higher brazing temperature and longer holding time made the interface structure of the C/C composite crack and TiC separate from the substrate, leading to a drop in shear strength of the joint. When the joint of the C/C composite and the TiAl alloy is brazing at 980℃ for 10 min, the shear strength reached the maximum 18 MPa at room temperature, and increased to 22 MPa at high temperature about 600℃.

Key words: braze, C/C composites, composite filler, interface structure, mechanical property, TiAl alloy

中图分类号:

TG454

曹健, 贺宗晶, 亓钧雷, 王厚勤, 冯吉才. 采用(Ti/Ni/Cu)_f多层箔钎焊C/C复合材料与TiAl合金[J]. 机械工程学报, 2018, 54(9): 108-114.

CAO Jian, HE Zongjing, QI Junlei, WANG Houqin, FENG Jicai. Brazing of C/C Composite to TiAl Alloy Using (Ti/Ni/Cu)_f Multi-foil Filler[J]. Journal of Mechanical Engineering, 2018, 54(9): 108-114.

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采用(Ti/Ni/Cu)_f多层箔钎焊C/C复合材料与TiAl合金

Brazing of C/C Composite to TiAl Alloy Using (Ti/Ni/Cu)_f Multi-foil Filler

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采用(Ti/Ni/Cu)f多层箔钎焊C/C复合材料与TiAl合金

Brazing of C/C Composite to TiAl Alloy Using (Ti/Ni/Cu)f Multi-foil Filler

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采用(Ti/Ni/Cu)_f多层箔钎焊C/C复合材料与TiAl合金

Brazing of C/C Composite to TiAl Alloy Using (Ti/Ni/Cu)_f Multi-foil Filler