机械工程学报 >

2016 , Vol. 52 >Issue 12: 59 - 66

DOI: https://doi.org/10.3901/JME.2016.12.059

材料科学与工程

采用Al-Si-Ti-Cu-In钎焊70% SiCp/Al复合材料工艺研究

  • 李娟 ,
  • 王克鸿
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  • 南京理工大学材料科学与工程学院 南京 210094
李娟,女,1990年出生,博士研究生。主要研究方向为铝基复合材料焊接,已发表论文3篇。E-mail：lijuanaishenghuo@163.com;王克鸿(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为先进焊接机理、方法和工艺、加工过程智能化数字化、机电一体化设备与机器人智能系统集成等。先后获国家技术发明、国防技术发明、国防科技、江苏省科技进步等二等奖6项,三等奖5项,发明专利36项,发表论文近百篇。E-mail：wkh1602@126.com

网络出版日期: 2016-06-15

基金资助

兵器预研支撑基金(62201070813)、江苏省自然科学基金(BK20131261)和江苏省科技(BE2011194)资助项目

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Study on Vacuum Brazing of 70%SiCp/Al Composites Using Al-Si-Ti-Cu-In Filler Metal

  • LI Juan ,
  • WANG Kehong
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  • School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094

Online published: 2016-06-15

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摘要

采用Al-Si-Ti-Cu-In钎料在不同工艺参数下对70% SiCp/Al复合材料进行真空钎焊,通过扫描电镜(Scanning electron microscope, SEM)、能谱分析(Energy dispersive spectrometer, EDS)技术对接头组织形貌进行分析。结果表明：采用600 ℃、6 MPa、保温1.5 h所得接头具有最大剪切强度90.17 MPa,断裂从母材开始,穿过钎料层,在另一侧母材中瞬断,其形貌具有韧、脆混合型断口形貌特征。焊缝微观组织主要包括蜂窝状Al基体、聚积的颗粒状富Ti、In相、环状富Si相和界面处的针状Al4C3脆性相。提高钎焊温度有利于焊缝中孔隙的收缩和减少,增加钎料对复合材料的润湿性,也有利于激发Ti的活性,阻碍Al4C3脆性相的生成。由于烧结体中孔隙变化规律和柯肯达尔效应的共同作用,使得焊缝中孔隙随保温时间的延长先减少后增加,若继续延长保温时间,孔隙终将消失。提高压力能有效改善焊缝致密度,阻碍Al4C3脆性相的形成,并改善其形态,能有效提高接头力学性能。

关键词： 真空钎焊; SiCp/Al复合材料; 温度; 保温时间; 压力

本文引用格式

李娟 , 王克鸿 . 采用Al-Si-Ti-Cu-In钎焊70% SiCp/Al复合材料工艺研究[J]. 机械工程学报, 2016 , 52(12) : 59 -66 . DOI: 10.3901/JME.2016.12.059

Abstract

The 70%SiCp/Al composites are brazed under different parameters in vacuum furnace, using Al-Si-Ti-Cu-In filler metal. Scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) technology are used to analysis the microstructure, also shear test is adopted to examine the strength. The results reveal that the joints mainly contain honeycomb Al base phase, Ti, In rich phase, annular Si rich phase and needle-like Al4C3 phase. The maximum shear strength achieved in this work is 90.17 MPa which is welded at 600 ℃, 1.5 h and 6 MPa. Fracture origin occurs in the base material, extends to the filler metal, and fractures instantaneously in the other base material. With the temperature raising, poles in the welds decrease and narrow, meanwhile wettability between the composites and filler metal improves and the needle-like Al4C3 phase is restrained due to the activated Ti element. When the holding time elongates, poles in the joints decrease first, then increase, which is caused by the comprehensive effect of sintering disciplinarian and Kirkendall effect. If the holding time is long enough, poles in the welds will totally disappear. High pressure can compact the welds, restrain the needle-like Al4C3 phase and improve its morphology which improve the mechanical properties of the joints.

Key words： vacuum brazing; SiCp/Al composites; temperature; holding time; pressure

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