Microstructure and mechanical properties of SiO2-BN ceramic and Invar alloy joints brazed with Ag-Cu-Ti

被引：19
作者：
Wang, Y. [1 ]
Yang, Z. W. [1 ]
Zhang, L. X. [2 ]
Wang, D. P. [1 ]
Feng, J. C. [2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China
来源：
JOURNAL OF MATERIOMICS | 2016年 / 2卷 / 01期
基金：
中国国家自然科学基金;
关键词：
SiO2-BN ceramic; Invar alloy; Brazing; Microstructure; Mechanical properties;
D O I：
10.1016/j.jmat.2015.10.003
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ag-Cu-Ti + TiH2+BN composite filler was prepared to braze SiO2-BN ceramic and Invar alloy. The interfacial microstructure, mechanical properties, and residual stress distribution of the brazed joints were investigated. The results show that a wave-like Fe2Ti-Ni3Ti structure appears in the Invar substrate and a thin TiN-TiB2 reaction layer forms adjacent to the SiO2-BN ceramic. The added BN particles react with Ti to form TiN-TiB fine-particles, which is beneficial to refine the microstructure of the brazing seam and to greatly inhibit the brittle compounds formation. The interfacial microstructure at various brazing temperatures was analyzed, and the mechanism for the interfacial reactions responsible for the bonding was proposed. The maximum shear strength of the joints brazed with the composite filler at 880 degrees C for 10 min is 39 MPa, which is 30% greater than that brazed with Ag-Cu-Ti alloy. The improvement of the joint strength is attributed to the variation of joint microstructure and the reduction of tensile stresses induced in the SiO2-BN ceramic. The finite element analysis indicates that the peak tensile stress decreases from 230 to 142 MPa due to the addition of BN particles in the ceramic. (C) 2015 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
引用
收藏
页码：66 / 74
页数：9
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