【摘要】 以Al-Zn-Mg-Cu合金为封装材料,采用粉末冶金技术对Al₂O₃陶瓷和304不锈钢进行了封接试验,研究了烧结合金组织、接头特征点成分和物相,并探讨了烧结温度和保温时间对接头界面组织和连接强度的影响。结果表明,在烧结温度570℃,保温时间1 h条件下获得主要由α-Al和MgZn₂组成的较为致密的铝合金,304不锈钢/铝合金侧剪切强度为24 MPa、Al₂O₃陶瓷/铝合金侧剪切强度为6.4 MPa。在304不锈钢/铝合金界面处,Fe、Al元素均发生扩散,形成了不同金属间化合物的扩散层。铝合金/Al₂O₃陶瓷界面处Mg与Al₂O₃反应生成了MgAl₂O₄相,改善了铝合金和Al₂O₃陶瓷的润湿性。更多还原

【Abstract】 Al₂O₃ ceramic and 304 stainless-steel were encapsulated with the lab-made filler of Al-Zn-Mg-Cu powder.The influence of the sintering temperature and time on the phases and shear-strength of the encapsulated seam was investigated with X-ray diffraction,energy dispersive spectroscopy,scanning electron microscopy.The results show that the sintering temperature and time had a major impact.For example,the shear-strengths decreased with an increase of sintering temperature,and changed in an increase-decrease mode with an increase of sintering time,as both the sintering temperature and time increased,the shear-strengths increased up to 11.4 MPa.Sintered at 570℃ for 1 h,fairly compact Al-Zn-Mg-Cu alloy formed,comprising α-Al,MgZn₂,Fe-Al and MgAl₂O₄phases;and the shear-strengths on the stainless-steel and Al₂O₃ sides were 24 MPa and 6.4 MPa,respectively.Formation of MgAl₂O₄possibly accounted for the improved wettability of Al-alloy and Al₂O₃ ceramic.更多还原