EFFECT OF ULTRASONIC TREATMENT ON THE ELECTRICAL RESISTANCE OF LIQUID Pb-20%Sn ALLOY

doi:10.11900/0412.1961.2014.00219

Acta Metall Sin

2014, Vol. 50

Issue (10): 1231-1236 DOI: 10.11900/0412.1961.2014.00219

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EFFECT OF ULTRASONIC TREATMENT ON THE ELECTRICAL RESISTANCE OF LIQUID Pb-20%Sn ALLOY

ZHANG Jianfeng^1,², LIU Shuang¹, LIU Xuan², WAN Jianjun², XU Qingliang³, LE Qichi²(

), CUI Jianzhong²

1 College of Science, Northeastern University, Shenyang 110819
2 Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819
3 Petrochina Daqing Petrochemical Company Acrylic Fiber Plant, Daqing 163714

Cite this article:

ZHANG Jianfeng, LIU Shuang, LIU Xuan, WAN Jianjun, XU Qingliang, LE Qichi, CUI Jianzhong. EFFECT OF ULTRASONIC TREATMENT ON THE ELECTRICAL RESISTANCE OF LIQUID Pb-20%Sn ALLOY. Acta Metall Sin, 2014, 50(10): 1231-1236.

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Abstract

The changes of Pb-20%Sn alloy melt's electrical resistance under different temperatures (300, 400 and 450 ℃), different ultrasonic powers (400, 600 and 800 W) and different treatment times (3, 5, 7 and 10 min) were investigated. The results show that the ultrasonic treatment has a strong influence on the melt’s electrical resistance. When the ultrasonic treatment is applied, the electrical resistance decreases immediately; after the ultrasonic treatment is removed, the electrical resistance increases instantly, but it does not reach its initial value. There is a difference between this electrical resistance and the initial value. This electrical resistance will remain constant for a long time, and then slowly increases to the initial value. The stronger the ultrasonic power is, the more significant influence the ultrasonic treatment will exert, the larger the transient variation of resistance (ΔR) and persistent variation of resistance (Δr) will be, and the longer the effective time will be. With the temperature increased, both ΔR and Δr will increase, and the effective time will increase at first and then decrease.With the extension of ultrasonic treating time, the ultrasonic effect will increase gradually, but there is a saturation treating time.

Key words: liquid Pb-20%Sn alloy ultrasonic treatment electrical resistance

Received: 29 April 2014

ZTFLH:

TG113.12

Fund: Supported by National Basic Research Program of China (No.2013CB632203), National Natural Science Foundation of China (No.50974037) and National Key Technology R&D Program of China (No.2012BAF09B01)

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	Jianfeng ZHANG
	Shuang LIU
	Xuan LIU
	Jianjun WAN
	Qingliang XU
	Qichi LE
	Jianzhong CUI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00219 OR https://www.ams.org.cn/EN/Y2014/V50/I10/1231

Fig.1 Schematic of experimental equipment (1—ultrasonic amplitude transformer; 2—thermocouple; 3—electrodes;4—melt container; 5—resistance furnace; 6—resistance meter;7—thermometer; 8—data acquisition equipment)

Fig.2 Effect of ultrasonic treatments on the resistance of Pb-20%Sn alloy (treating temperature: 400 ℃, ultrasonic power: 800 W, treating time: 3 min, ΔR—transient variation of resistance, Δr—persistent variation of resistance, Δt₁—ultrasonic treating time, Δt₂—steady state process time, Δt₃—slow recover time, Δt—effective time)

Fig.3 Effects of ultrasonic power on ΔR (a) and Δr (b) at different temperatures (Δt₁=5 min)

Fig.4 Effects of ultrasonic treating time on ΔR (a) and Δr (b) at 450 ℃

Fig.5 Effect of ultrasonic treatment parameters on Δt

(a) Δt vs treating temperature

(b) Δt vs treating time

Fig.6 Effect of ultrasonic treatment parameters on Δt₂

(a) Δt₂ vs treating temperature

(b) Δt₂ vs treating time

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