超声波作用下多孔Si_(3)N_(4)陶瓷的快速润湿机理研究  

Mechanism of Rapid Wetting Porous Si_(3)N_(4) Ceramics Under Ultrasonication

作　　者：李政玮 许志武[1] 陈姝[1] 张睦坤 任勃旭 闫久春[1] LI Zhengwei;XU Zhiwu;CHEN Shu;ZHANG Mukun;REN Boxu;YAN Jiuchun(State Key Laboratory of Advanced Welding and Joining,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

出　　处：《航空制造技术》2022年第21期87-91,111,共6页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51574099);中国博士后科学基金资助(2022M710937)。

摘　　要：为解决多孔陶瓷真空钎焊润湿时温度高、保温时间长、需真空环境和活性元素等缺点,利用超声波辅助方法实现多孔陶瓷的快速润湿,研究了超声功率对润湿效果的影响。结果表明,超声波作用下Sn9Zn非活性钎料在230℃时仅需10 s即可实现对多孔Si_(3)N_(4)陶瓷的润湿。超声功率为333.3 W时,钎料可渗入陶瓷基体25μm;渗入层的宽度随超声功率的增加而增大;超声功率为1000 W时,渗入层的厚度可达80μm。因焊接温度低,冷却后渗入层内的残余应力很小,陶瓷和钎料结合紧密、无裂纹。透射电镜的测试结果表明,润湿界面主要富集O元素和Zn元素。本文中多孔陶瓷的快速润湿可归因于钎料内的超强声空化作用,空化泡溃灭产生极高的温度、压力和液体流速,使非活性钎料在极短的时间内完成对陶瓷的润湿。To solve the problems of high temperature,long holding time,vacuum environment and active elements when vacuum brazing porous ceramics,this work used ultrasonic assistance to realize the rapid wetting of porous ceramics,and the effect of ultrasonic power on the wetting effect was studied.The results showed that the Sn9Zn non-active solder wetted the porous ceramics within 10 s at 230℃under ultrasonication.When the ultrasonic power was 333.3 W,the solder infiltrated the ceramic matrix by a width of 25μm.The width of the infiltration layer increased with increasing the ultrasonic power.The width of the infiltration layer was 80μm when the ultrasonic power was 1000 W.Due to the low temperature during the wetting process,the residual stress in the infiltration layer after cooling was low,and thus the ceramic and the solder were closely bonded without cracks.The results of transmission electron microscopy showed that the wetting interface was enriched with oxygen and zinc elements.In this work,the rapid wetting of the porous ceramics can be attributed to the intense cavitation of the solder inside the microchannel of the porous ceramics.The extremely high temperature and pressure caused by the collapse of cavitation bubbles caused the non-active solder to rapidly wet the porous ceramics.

关 键 词：超声波 多孔陶瓷 润湿 钎焊 界面 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]