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连接温度850℃,保温时间60 min,用泡沫镍金属作为中间层真空钎焊Al_2O_3陶瓷与1Cr18Ni9Ti不锈钢,利用扫描电子显微镜(SEM)、能谱(EDS)分析钎焊接头的微观组织,利用剪切实验检测接头的力学性能。实验结果表明,不添加中间层时,接头平均剪切强度只有7.7 MPa,断裂位置发生在陶瓷侧;添加泡沫镍中间层时,接头平均剪切强度达到101.7 MPa,断裂位置发生在陶瓷与泡沫镍金属连接界面处。不添加中间层时,Ti元素主要分布在钎料与陶瓷以及钎料与不锈钢反应界面处;添加中间层后钎焊接头中Ti元素主要分布在中间层,与Ni元素形成TiNi_3,Ag、Cu和Ti元素分布更加均匀。
The microstructure of the brazed joints was analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) with the bonding temperature of 850 ℃ and the holding time of 60 min. Vacuum brazed Al_2O_3 ceramics and 1Cr18Ni9Ti stainless steel with nickel foam as the intermediate layer were used. Experimental testing joints mechanical properties. The experimental results show that the average shear strength of the joints is 7.7 MPa and the fracture position occurs on the ceramic side without the addition of the middle layer. The average shear strength of the joints reaches 101.7 MPa with the addition of the foamy nickel interlayer, and the fracture location occurs between the ceramic and the foam nickel Metal connection interface. When no interlayer was added, Ti was mainly distributed in the interface of brazing material and ceramic, and between brazing filler metal and stainless steel. The Ti elements in the brazed joints were mainly distributed in the middle layer after the intermediate layer was added, and TiNi3, Ag, Cu and Ni Ti element distribution more evenly.