超声振动处理时间对Pb-Ag合金组织及性能的影响  

Effect of Ultrasonic Vibration Processing Time on Microstructure and Performance of Pb-Ag Alloy

作　　者：张俊[1] 张喆[1] 周生刚[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《热加工工艺》2015年第7期17-19,27,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51074082;51264025;51201080);云南省应用基础研究计划项目(KKSY201251086)

摘　　要：通过采用恒定的熔体温度、超声功率及频率、施振深度,对Pb-Ag合金熔体施振不同时间,探讨超声处理对Pb-Ag合金的显微组织及电化学性能的影响。结果表明,在熔体温度为370℃时,熔体粘度适宜,空化效应和声流作用明显,短暂的施振处理（1~2 min）即可达到理想的细晶效果,而长时间的超声波处理（3~5 min）只会引起熔体内较大的热效应,使细小的晶粒重熔,从而使得晶粒粗大。通过适宜的超声处理,Pb-Ag合金显微组织显著细化、均化,电化学性能有所提升,其中电阻率下降12.95%,极化电位负移290 mV,槽电压下降1.77%,达到了一定的节能降耗的目的,为今后制备高性能低能耗的Pb-Ag合金电极奠定了基础。The effects of ultrasound on the microstructure and electrochemical performance were studied by using a constant power, frequency and vibration depth ultrasonic to treat Pb-Ag alloy melt at different range of temperatures. The results show that the cavitation and acoustic streaming would be given full play when the melt temperature reaches 370℃ and the melt viscosity is suitable, the ideal effect of refining will be obtained under short vibration treatment （1-2min）, however, much bigger inner heating effects will be made by long time of ultrasonic treatment （3-5min） which will make refined grains remelt and lead to the grains coarsening. Only under the vibration time at 1 min, the ultrasonic treatment could make the microstructure remarkably refine and homogenize. In addition, the electrochemical performance improves, the resistivity decreases by 12.95%, the polarization potential shifts 298 mV negatively and cell voltage reduces by 1.77%. It has achieved the energy-conserving goal and could lay the foundation for the future Pb-Ag alloy electrode which has high performance and low-energy.

关 键 词：超声波处理 施振时间 Pb-Ag合金 显微组织 电化学性能 

分 类 号：TG249[金属学及工艺—铸造] TF803.27[冶金工程—有色金属冶金]