钛对CuAgTi钎料钎焊钨重合金接头组织与性能的影响

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal.

作者信息

Lu Yuzhen, Qiu Xiaoming, Ruan Ye, Luo Cui, Xing Fei

机构信息

Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130022, China.

Key of Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China.

出版信息

Materials (Basel). 2019 Mar 30;12(7):1057. doi: 10.3390/ma12071057.

DOI:10.3390/ma12071057

PMID:30935073

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6480020/

Abstract

In this paper, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were used to comprehensively analyze the microstructure and brazing performance of a CuAgTi filler metal with braze tungsten heavy alloys. The association of microstructure, wettability and shear strength of brazing joints was also investigated. With the addition of Ti, the Ti₃Cu₄ phase appeared in the microstructure of filler metal. Ti is active element that promotes the reaction of filler with tungsten. Therefore, the Ti element is enriched around tungsten and forms a Ti₂Cu layer at the interface, leaving a Cu-rich/Ti-poor area on the side. Remaining Ti and Cu elements form the acicular Ti₃Cu₄ structure at the center of the brazing zone. The wettability of filler metal is improved, and the spreading area is increased from 120.3 mm² to 320.9 mm² with the addition of 10 wt.% Ti. The shear strength of joint reaches the highest level at a Ti content of 2.5 wt.%, the highest shear strength is 245.6 MPa at room temperature and 142.2 MPa at 400 °C.

摘要

本文采用扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）对含钛铜银钎料与钨重合金的微观结构及钎焊性能进行了综合分析。同时研究了钎焊接头微观结构、润湿性和剪切强度之间的关系。随着钛的加入，钎料微观结构中出现了Ti₃Cu₄相。钛是促进钎料与钨反应的活性元素。因此，钛元素在钨周围富集，并在界面处形成Ti₂Cu层，在另一侧留下富铜/贫钛区域。剩余的钛和铜元素在钎焊区中心形成针状Ti₃Cu₄组织。钎料的润湿性得到改善，添加10 wt.%钛后铺展面积从120.3 mm²增加到320.9 mm²。接头的剪切强度在钛含量为2.5 wt.%时达到最高水平，室温下最高剪切强度为245.6 MPa，400 °C时为142.2 MPa。