摘要
用Ａｌ－３ｗｔ％Ｔｉ合金真空加压钎焊Ｓｉ３Ｎ４陶瓷，研究了压力对钎缝组织与接头性能的影响。结果表明，如果填充金属钎焊时处于固液双相区，施加压力既能减小钎缝宽度，又能改善钎缝金属组织，使接头强度得到提高；加压可以作为一种改性钎缝金属的方式。含大量Ａｌ３Ｔｉ的Ａｌ－３ｗｔ％Ｔｉ钎焊接头与用纯Ａｌ钎焊的接头相比，其高温性能得到明显改善，前者６００℃时的剪切强度为２９ＭＰａ，而后者只有４．５ＭＰａ。
Pressure brazing of Si 3N 4 ceramics in vacuum with Al 3wt%Ti alloy was performed, and effects of bonding pressure on the microstructures of braze metal and the joints' strength were investigated. For solid liquid state brazing, bonding pressure will not only reduce the width of braze metal but also modify its microstructures, which results in that the joint's strength is improved. Bonding pressure imposition can be used as one of the methods modifying braze metal. The high temperature properties of joints brazed with Al 3wt%Ti alloy which braze metal contains a large amount of Al 3Ti phase are improved significantly compared with that of the joints brazed with pure Al, and their shear strength at 600℃ is 29MPa and 4.5 MPa, respectively.
出处
《航空材料学报》
EI
CAS
CSCD
1999年第2期48-53,共6页
Journal of Aeronautical Materials
基金
国家自然科学基金
博士学科点专项科研基金
关键词
加压
钎焊
陶瓷
高温性能
铝基合金
焊接头
Al based alloy
pressure brazing
ceramics
high temperature property
