摘要
研制了三种急冷Ａｌ基活性钎料。研究结果表明：急冷Ａｌ基活性钎料的组织明显细化，熔点明显下降，基体硬度升高。在较低的钎焊温度（７５０℃）下，下加Ｎｉ粉的接头的剪切强度较高（２０８．８ＭＰａ）。钎焊温度对接头强度影响较大。当超过一定钎焊温度后，接头强度明显下降；加Ｎｉ粉复合钎焊可明显提高接头的剪切强度，在钎焊温度为８００℃时接头的最高剪切强度为２２５ＭＰａ，加Ｎｉ粉的复合接头在界面两侧形成均匀分布富Ｎｉ带。这是接头强度提高的主要原因。
In this.paper,three kinds of new rapidly solidified(RS)Al-based active filler metals have been devel-oped.The properties of tbese filter metals have been studied.The results show that after rapid solidifica-tion,the Al-based active filler metals have finer microstructure,more homogeneous composition,lowermelting point and higher hardness. The results show that the maximum shear strength of joint with RSAl-based active filler metal at the brazing temperature of 750℃is 208.8MPa. Brazing temperature hasmore influence on the strength of joint.When the brazing temperature exceeds a certain value,the strengthof joint decreases remarkably.The maximum shear strength of joints with Ni powders was enhanced dis-tinctly.The maximum shear strength of joint using RS Al-based active filler metal with Ni powders is225MPa at brazing temperature of 800℃.Two Ni-rich layers formed at interface of joints with Ni pow-ders.The main reason that shear strength of joint was enhanced was homogeneous Ni-rich layer formed atinterface of joints.
出处
《航空材料学报》
CAS
CSCD
1994年第2期23-30,共8页
Journal of Aeronautical Materials
基金
博士点基金
关键词
急冷
活性钎料
钎焊
陶瓷
rapidly solidification,active filler metal,brazing,ceramic
