不基于熔态润湿的Al/Al2O3直接钎焊

doi:10.15541/jim20150497

无机材料学报 ›› 2016, Vol. 31 ›› Issue (6): 602-606.DOI: 10.15541/jim20150497

不基于熔态润湿的Al/Al₂O₃直接钎焊

陈凡¹, 石恺成¹, 孙士阳^1,2, 赵博文¹, 尚海龙¹, 李戈扬¹

(1. 上海交通大学金属基复合材料国家重点实验室, 上海 200240; 2. 内蒙古科技大学, 包头 014010)

收稿日期:2015-10-13 修回日期:2015-12-25 出版日期:2016-06-20 网络出版日期:2016-05-19
作者简介:陈凡(1990–), 男, 博士研究生. E-mail: sayno2010@sjtu.edu.cn
基金资助:
国家自然科学基金(51371118, 51401120)

Direct Brazing of Al/Al₂O₃ without Wettability of Molten Metal

CHEN Fan¹, SHI Kai-Cheng¹, SUN Shi-Yang^1,2, ZHAO Bo-Wen¹, SHANG Hai-Long¹, LI Ge-Yang¹

(1. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China; 2. College of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China)

Received:2015-10-13 Revised:2015-12-25 Published:2016-06-20 Online:2016-05-19
About author:CHEN Fan. E-mail: sayno2010@sjtu.edu.cn
Supported by:
National Natural Science Foundation of China(51371118, 51401120)

摘要/Abstract

摘要：

针对Al熔液在850℃以下不润湿Al₂O₃而难以直接钎焊的困难, 本工作研究了溅射Al对Al₂O₃的“润湿”作用, 提出了一种采用溅射Al基薄膜作为钎料直接钎焊Al₂O₃的方法。结果表明, 这种方法可以在不满足熔态Al润湿条件的680℃实现Al和Al-Cu合金对Al₂O₃的直接真空钎焊, 并且仅需0.1 Pa的真空度。所获得的Al/Al₂O₃的接头剪切强度达到115 MPa, Al-1.6at% Cu合金钎焊接头的剪切强度可提高到163 MPa, 当钎料中的Cu含量提高至14.3at%后, 钎焊接头中焊缝与陶瓷界面产生Cu的偏聚, 接头的剪切强度因界面断裂降低为127 MPa。并对这种不基于金属熔态润湿钎焊方法的原理进行了分析讨论。

关键词: 钎焊, 润湿性, Al2O3, 接头强度, Al合金

Abstract:

Al₂O₃cannot be directly brazed with aluminum due to the poor wettability of aluminum on alumina below 850℃. Based upon effect of sputtered aluminum wetting on Al₂O₃, a direct brazing method was proposed to utilize sputtered Al-based films as brazing fillers on alumina. The results show that direct brazing of Al₂O₃by Al and Al-Cu alloy can be achieved at 680℃ in vacuum with vacuum level only of 0.1 Pa. Through this method, the shear strength of joint with pure Al as brazing filler is 115 MPa and that with Al-1.6at% Cu is up to 163 MPa. When the Cu content in the Al-Cu alloy increases to 14.3at%, the shear strength of joint decreases to 127 MPa, due to the joint fracture generating at the interface caused by the interfacial segregation of Cu. Moreover, the principle of this direct brazing method not based on wettability of molten metal is analyzed.

Key words: brazing, wettability, alumina, joint strength, aluminum alloy

中图分类号:

TQ174
TG454

陈凡, 石恺成, 孙士阳, 赵博文, 尚海龙, 李戈扬. 不基于熔态润湿的Al/Al₂O₃直接钎焊[J]. 无机材料学报, 2016, 31(6): 602-606.

CHEN Fan, SHI Kai-Cheng, SUN Shi-Yang, ZHAO Bo-Wen, SHANG Hai-Long, LI Ge-Yang. Direct Brazing of Al/Al₂O₃ without Wettability of Molten Metal[J]. Journal of Inorganic Materials, 2016, 31(6): 602-606.

图/表 4

图1 不同Cu含量钎料接头的剪切强度

Fig. 1 Shear strength of the brazing joints with filler metals containing various Cu contents

图2 不同成分钎料焊缝的SEM照片

Fig. 2 SEM images of the brazing joints with different Cu content fillers. (a) Pure Al; (b) Al-1.6at% Cu; (c) Al-14.3at% Cu; and (d) Cu X-ray map corresponding to area of (c)

图3 钎焊接头剪切断口的高景深光学显微镜照片

Fig. 3 Shear fracture morphologies of the brazing joints with different brazing fillers through optical microscope with a large depth of field. (a) Pure Al; (b) Al-1.6at% Cu; (c) Al-14.3at% Cu

图4 Al薄膜熔化后的高景深光学显微镜三维形貌照片

Fig. 4 Three-dimensional morphologies of Al films after melting through optical microscope with a large depth of field. (a) Al2O3/ Cu(50 nm)/Al(7 μm) sample; (b) Al2O3/Al(50 nm)/Cu (50 nm)/Al(7 μm) sample

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不基于熔态润湿的Al/Al₂O₃直接钎焊

Direct Brazing of Al/Al₂O₃ without Wettability of Molten Metal

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