Al_2O_3陶瓷与金属镍的活性钎焊研究

Study on Active Brazing of Al_2O_3 Ceramic and Ni

由于物理和化学性质的差异,实现陶瓷与金属的连接比较困难。本实验使用Ag-Cu-Ti活性钎料钎焊镍与Al2O3陶瓷。对钎焊后的试件进行剪切试验,确定接头强度最高时的温度为1000℃,而温度低于960℃时无法成功钎焊镍与陶瓷,温度高于1000℃会使钎焊接头强度下降。采用材料测试分析方法对钎焊接头组织进行分析,发现Cu在接头内平均分布,Ag呈聚集态,而Ti分布在接头的两侧。反应产物中的元素包括Cu,Ti,Al,Zr,O等,Ti,Cu与Al2O3陶瓷发生反应在界面处生成复杂化合物,从而实现陶瓷与金属的连接。

It is difficult to join ceramic and metal because of differences in physical and chemical properties. In this experiment , Al2O3ceramic and Ni had been brazed with Ag-Cu-Ti active alloy. The result of shear test indicated that strength of brazing joint was the highest one when brazed at 1000℃. When the temperature was less than 960℃, active alloy could not join Al2O3 ceramic and Ni. But the strength of brazing joint decreased at higher than 1000℃. The microstructure of joint had been analyzed by material test analysis methods. The results showed that Cu distributed averagely in joint. The gathering phenomena of Ag appeared. Ti distributed on both sides of joint. The element of products included Cu,Ti,Al, Zr, O and so on. Complex compounds which generated from the reaction among Cu,Ti and Al2O3 ceramic jointed ceramic and metal.