PZT压电陶瓷与TC4合金钎焊连接界面结构设计  

Structure Design of Brazed Joint Interface Between PZT Piezoelectric Ceramic and TC4 Titanium Alloy

作　　者：肖海英[1,2] 张书野 杜勿默 林盼盼[1] 林铁松[1] XIAO Haiying;ZHANG Shuye;DU Wumo;LIN Panpan;LIN Tiesong(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《硅酸盐学报》2022年第9期2430-2438,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51975150和51974101);黑龙江省自然科学基金(LH2020E037);云南省重大科技专项云南省稀贵金属材料基因工程(一期2020)-贵金属材料专业数据库建设及应用示范(Ⅰ期)(202002AB080001-1)。

摘　　要：压电陶瓷由于具有逆压电效应被应用于超声电机的制造中,为克服超声电机制造过程中采用有机物粘接方式出现的接头导电性差、易老化和连接精度低等问题,本工作采用磁控溅射方式对PZT压电陶瓷进行表面金属化以提高PZT压电陶瓷与TC4钛合金之间的焊接性并探究了不同金属化层对钎焊接头微观组织的影响。结果表明:Ag与母材之间的结合力较差,未焊合位置出现于Ag层与母材的结合处。当使用Ti/Ag作为金属化层时,由于Ag与Ti的结合力较差,未焊合易出现于Ti与Ag的结合处。当金属化层为Ni/Ag时,Ni可与钎料形成Ni—Sn层,提高接头的连接可靠性。最终确定母材表面金属化层选用复合金属层即母材/Ti/Ni/Ag结构,并对该连接接头典型微观组织进行了分析。结果表明,该复合金属层可提高金属化层与母材之间的结合力并实现PZT陶瓷母材与TC4合金之间的有效连接。连接界面微观组织结构为β-Sn/Ag_(3)Sn/β-Sn+Ni_(3)Sn_(4)/Ni_(3)Sn+Ni/Ti_(2)Ni/Ti_(2)Ni+α-Ti/PZT。Piezoelectric ceramics are used in the manufacture of ultrasonic motor because of its inverse piezoelectric effect.However,some problems of poor joint conductivity,easy aging and low connection accuracy caused by organic bonding in the manufacture of ultrasonic motor need to be solved.In this paper,the surface of PZT piezoelectric ceramics was metallized via magnetron sputtering to improve the weldability between PZT piezoelectric ceramic and TC4 titanium alloy.The results show that the bonding force between Ag and base metal is poor,and the unwelded position appears at the junction of Ag layer and base metal.The welding is easy to occur at the junction of Ti and Ag when Ti/Ag is a metallized layer due to the poor bonding force between Ag and Ti.Ni and solder can form Ni—Sn layer to improve the joint reliability when the metallized layer is Ni/Ag.A composite metal layer,that is,the base metal/Ti/Ni/Ag structure,was selected as a metallized layer on the base metal surface,and the typical microstructure of the joint was analyzed.The results show that the composite metal layer can improve the bonding strength between the metallized layer and the base metal and realize the effective bonding between the BASE metal of PZT ceramics and TC4 alloy.The microstructure of the interface isβ-Sn/Ag_(3)Sn/β-Sn+Ni_(3)Sn_(4)/Ni_(3)Sn+Ni/Ti_(2)Ni/Ti_(2)Ni+α-Ti/PZT.

关 键 词：钛锆酸铅陶瓷 磁控溅射 表面金属化 钛六铝四钒合金 间接钎焊 

分 类 号：TG425[金属学及工艺—焊接]