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金属学报  2018, Vol. 54 Issue (4): 575-580    DOI: 10.11900/0412.1961.2017.00159
  本期目录 | 过刊浏览 |
镀膜Al箔钎料对AlN陶瓷的钎焊
张笑一1, 尚海龙1,2(), 马冰洋1,2, 李荣斌2, 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 上海电机学院 上海 201306
Brazing of Coated Al Foil Filler to AlN Ceramic
Xiaoyi ZHANG1, Hailong SHANG1,2(), Bingyang MA1,2, Rongbin LI2, Geyang LI1
1 State Key Laboratory of Metal Matrix Composites, Shanghai JiaoTong University, Shanghai 200240, China
2 Shanghai Dianji University, Shanghai 201306, China
全文: PDF(4878 KB)   HTML
摘要: 

为了实现Al钎料对AlN的直接钎焊,提出了一种可以在熔化后自行去除表面Al2O3膜的镀膜Al箔钎料,以及提高Al钎焊AlN接头强度的升温钎焊方法,研究了表面气相沉积Ni/Al双层薄膜对Al箔表面Al2O3氧化膜的自去除作用,以及钎焊温度对接头强度提高的作用。结果表明,由于被Ni/Al双层薄膜掩埋,原Al箔表面的Al2O3氧化膜在钎料加热及熔化的过程中被破碎并卷入到含1%Ni (原子分数)的Al液中,实现了Al对AlN的无界面反应过渡层直接钎焊。采用升高钎焊温度的方法,可显著提高接头的强度。680 ℃钎焊时,由于Al液不润湿AlN,接头的断裂发生在Al钎缝与AlN的界面,剪切强度为79 MPa;随着钎焊温度的提高和润湿性的改善,Al/AlN的界面强度得到显著提高,接头的断裂逐步由界面转移至钎缝金属中,接头强度也相应逐步提高,并在840 ℃后达到最高值(146 MPa)。

关键词 钎焊AlN陶瓷Al箔氧化膜接头强度    
Abstract

The wettabilities of molten metals on ceramics are poor normally. In order to improve the wettability, all existing ceramic brazing methods introduce a compound transition layer formed by the reaction of active metal and ceramic. The transition layer between brazing seam and ceramic however creates negative effect on the properties of brazing joints. Although Al is the scarce metal which can wet some ceramics such as AlN and Al2O3 without reaction, the difficulty of removing oxide layer on surface prevents it being ceramic brazing filler. This work proposed a kind of coated Al foil filler able to remove its own Al2O3 film and an elevating temperature brazing process to enhance Al/AlN joint strength. Removing Al2O3 film effect of vapor deposited Ni/Al double layer film on Al foil and the effect of brazing temperature on improving joint strength were studied. The results showed that due to buried by Ni/Al double layer film, Al2O3 film on Al foil original surface broken and was swept in Al-1%Ni (atomic fraction) alloy liquid during heating and melting process. As a result, the direct brazing of Al to AlN without interface reaction transition layer was realized. The joint strength was significantly enhanced by elevating brazing temperature. When brazing at 680 ℃, the joint fractured along the interface between Al seam and AlN and the sheer strength was 79 MPa because of Al liquid not wetting AlN. With the elevating of brazing temperature, the wettability and interface strength of Al/AlN improved. The fracture gradually transferred to brazing seam from interface. The joint strength increased and reached to the maximum value of 146 MPa at 840 ℃.

Key wordsbrazing    AlN ceramic    Al foil    oxide film    joint strength
收稿日期: 2017-05-02     
ZTFLH:  TG454  
基金资助:国家自然科学基金项目Nos.51401120和51671125,上海自然科学基金项目No.16ZR1412800
作者简介:

作者简介 张笑一,女,1993年生,硕士生

引用本文:

张笑一, 尚海龙, 马冰洋, 李荣斌, 李戈扬. 镀膜Al箔钎料对AlN陶瓷的钎焊[J]. 金属学报, 2018, 54(4): 575-580.
Xiaoyi ZHANG, Hailong SHANG, Bingyang MA, Rongbin LI, Geyang LI. Brazing of Coated Al Foil Filler to AlN Ceramic. Acta Metall Sin, 2018, 54(4): 575-580.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2017.00159      或      http://www.ams.org.cn/CN/Y2018/V54/I4/575

图1  Al箔和镀膜Al箔中Al2O3膜在Al熔化前后变化示意图
图2  陶瓷钎焊接头剪切强度测量的夹具示意图
图3  Ni、Al、O在镀膜Al箔钎料中随深度的分布
图4  840 ℃钎焊接头的SEM像
图5  接头剪切强度随钎焊温度的变化
图6  不同钎焊温度接头剪切断口的OM像
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