TiB2-TiC-SiC复合陶瓷接触反应钎焊接头界面组织及力学性能

蔡小强; 王东坡; 王颖; 杨振文

doi:10.7527/S1000-6893.2021.25006

航空学报 >

2022 , Vol. 43 >Issue 2: 625006 - 625006

DOI: https://doi.org/10.7527/S1000-6893.2021.25006

先进航空材料焊接/连接专栏

TiB₂-TiC-SiC复合陶瓷接触反应钎焊接头界面组织及力学性能

蔡小强 ,
王东坡 ,
王颖 ,
杨振文

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天津大学天津市现代连接技术重点实验室, 天津 300072

收稿日期: 2020-11-23

修回日期: 2020-12-21

网络出版日期: 2021-02-08

基金资助

国家自然科学基金（52175357）；天津市科技计划（19ZXJRGX00100）

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Interfacial microstructure and mechanical properties of TiB₂-TiC-SiC ceramics joints fabricated by contact reactive brazing technique

CAI Xiaoqiang ,
WANG Dongpo ,
WANG Ying ,
YANG Zhenwen

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Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China

Received date: 2020-11-23

Revised date: 2020-12-21

Online published: 2021-02-08

Supported by

National Natural Science Foundation of China (52175357); Science and Technology Program of Tianjin (19ZXJRGX00100)

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摘要

采用Ti-Ni中间层体系对TiB₂-TiC-SiC （TTS）复合陶瓷进行了钎焊连接，研究不同的钎料成分和保温时间对接头界面组织和力学性能的影响。结果表明：钎料成分变化会引起界面反应机制由Ti与TTS复合陶瓷反应为主的过程向Ni与TTS复合陶瓷反应为主的过程转变。采用Ti-24at% Ni钎料钎焊TTS复合陶瓷时，界面反应主要发生在Ti与TTS复合陶瓷之间，反应产物主要为Ti与TiB₂反应形成的TiB以及与SiC反应形成的TiC和Ti₅Si₃。采用Ti-83at% Ni钎料钎焊TTS复合陶瓷时，界面反应主要发生在Ni与TTS复合陶瓷之间，尤其是与SiC的反应，反应产物主要为Ni₂Si和C。此外，保温时间显著影响TTS/Ti-24at% Ni/TTS接头的界面组织和力学性能。随着保温时间的延长，接头中连续的Ti₂Ni化合物消失，形成大量的TiB和Ti₅Si₃。与此同时，TTS复合陶瓷侧界面反应层逐渐增厚。在钎焊温度为1 040℃，保温时间为30 min条件下，采用Ti-24at% Ni钎料钎焊TTS复合陶瓷获得的接头室温抗剪强度最大，达到168±10 MPa，高温（800℃）抗剪强度达到81±18 MPa。

关键词： 二硼化钛; 碳化钛; 碳化硅; 钎焊; 界面组织; 抗剪强度

本文引用格式

蔡小强 , 王东坡 , 王颖 , 杨振文 . TiB₂-TiC-SiC复合陶瓷接触反应钎焊接头界面组织及力学性能[J]. 航空学报, 2022 , 43(2) : 625006 -625006 . DOI: 10.7527/S1000-6893.2021.25006

Abstract

Ti-Ni brazing alloy is successfully used to braze the TiB₂-TiC-SiC (TTS) composite ceramic. The influence of change in Ti-Ni brazing alloy composition and brazing time on the interface microstructure and mechanical properties of the joint is studied. The results show that the change of Ti-Ni brazing alloy composition caused the interface reaction to change from a process dominated by the reaction of Ti and TTS ceramic to a process dominated by the reaction of Ni and TTS ceramic. When TTS ceramic is brazed using Ti-24at%Ni brazing alloy, the interface reaction mainly occurred in Ti and TTS ceramic, and the reaction products were TiB₂, TiC and Ti₅Si₃. When TTS ceramic is brazed using Ti-83at%Ni brazing alloy, the interface reaction, especially the reaction with SiC, mainly occurred in Ni and TTS composite ceramics, and the reaction products are mainly Ni₂Si and C. With an increase in the brazing temperature, the continuous Ti₂Ni layer in the brazing seam gradually disappeared, and is replaced by TiB and Ti₅Si₃. In addition, the thickness of the reaction layer increased with the increase of the brazing temperature. The maximum shear strength of the joint achieved at room temperature was 168±10 MPa when the TTS ceramic joint was brazed using Ti-24at%Ni brazing alloy at 1040℃ for 30 min, whereas it was 81±18 MPa when the joint is tested at 800℃.

Key words： titanium diboride; titanium carbide; silicon carbide; brazing; interfacial microstructure; shear strength

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