On-Line Monitoring of Liquid Magnesium using a High Temperature Ultrasonic Probe

Burhan, Dikky; Ihara, Ikuo; Kamado, Shigeharu; Aso, Hiroshi; Kojima, Yo

doi:10.4028/www.scientific.net/msf.419-422.665

Cited by 6 publications

(13 citation statements)

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“…The sensor mainly consists of a 5 or 2.25 MHz conventional piezoelectric ultrasonic transducer (UT), an air-cooling pipe and a Ti rod as a waveguide. The basic construction of this sensor is almost the same as the ones used in the previous works, [16][17][18][19][20] except for the waveguide material. The length and diameter of the Ti waveguide are 300 and 30 mm, respectively.…”

Section: Ultrasonic Waveguide Sensormentioning

confidence: 60%

“…The UT end of the waveguide is air-cooled by the cooling pipe to maintain the temperature below 50 C so that the conventional piezoelectric UT functions properly while the probe end of the waveguide is immersed in molten Al alloy at 800 C. 20) The flow rate and pressure of the air cooling are 0.43 m 3 /min and 7 Â 10 4 kg/m 2 , respectively.…”

Section: Ultrasonic Waveguide Sensormentioning

confidence: 99%

“…In order to overcome such difficulty, recently clad waveguides with superior ultrasonic wave guidance and high SNR have been developed. 14,15) Using such clad waveguides, several ultrasonic pulse-echo measurements have been successfully performed for molten Zn, 16) Al 17,18) and Mg 19,20) at temperature up to 800 C.…”

Section: Introductionmentioning

confidence: 99%

“…Although a stainless steel was used as waveguide materials in the earlier works, [16][17][18][19][20] it is certain that the steel waveguide is slowly and definitely attacked by chemical reactions with molten Al. We have chosen titanium (Ti) as the waveguide material because the sustainability of Ti in molten Al is higher than that of steel.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The concept of an ultrasonic waveguide is a common technique for molten metal measurements. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] This technique is rather classical, but it is still attractive because of its simplicity, robustness and cost effectiveness. In this technique, measurements are made using a waveguide while the probe end is immersed in molten metals.…”

Section: Introductionmentioning

confidence: 99%

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<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

2005

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The in situ observations of solidification and melting of an aluminum-silicon alloy (Al-12.6%Si) using an ultrasonic waveguide sensor are presented. The ultrasonic sensor consists of a conventional piezoelectric ultrasonic transducer, a cooling system and a titanium (Ti) rod as an ultrasonic waveguide. The sustainability of the Ti rod in the molten Al alloy is investigated by immersion tests for 1, 4, 8 and 16 h at 800 C. The formation of a layer consisting of globular TiAl 3 , disperse AlSi 2 Ti and -Al phases has been observed at the interface between the Ti and the Al alloy. Ultrasonic pulse-echo measurements of the Al alloy during solidification and melting have been performed using the ultrasonic sensor in temperature range from 200 to 800 C. The longitudinal wave velocity of the Al alloy shows a rapid and significant change from about 3900 to 5600 m/s around the eutectic point. An attempt to measure a solid/liquid interface of the Al alloy has been made at frequency of 2.25 MHz. The reflected echo from the interface undergoing directional solidification has been observed. The position and growth rate of the interface have also been determined from the reflected echo.

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Section: Ultrasonic Waveguide Sensormentioning

confidence: 60%

Section: Ultrasonic Waveguide Sensormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

2005

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In Situ Monitoring of Growth Interfaces: A Review of Noninvasive Methods

Grujić

Hegna

Laundal

2012

JOM

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Ultrasonic in-situ monitoring of solidification and melting behaviors of an aluminum alloy

Ihara

Burhan

Seda

IEEE Ultrasonics Symposium, 2004

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This paper presents a newly developed high temperature ultrasonic sensor and its application to in-situ observation of aluminum alloy during solidification and melting in temperature up to 800 ºC. The ultrasonic sensor mainly consists of a conventional piezoelectric transducer and a titanium buffer rod as an acoustic waveguide. The length is 300 mm. This sensor, owing to the unique characteristics of titanium, is highly expected to provide not only high acoustic coupling to molten aluminum but also high corrosion resistance. It is demonstrated that the titanium buffer rod has superior sustainability and wettability to the molten aluminum alloy. Using the ultrasonic sensor, the changes of the longitudinal velocity of the aluminum alloy during solidification and melting have been monitored as a function of temperature. Furthermore, a clear reflected echo from the solid-liquid interface of the aluminum alloy has been observed. The movement of the reflected echo due to the growth of the solid-liquid interface has also been monitored during cooling process. Thus, it is demonstrated that the developed ultrasonic sensor using a titanium rod is a promising tool for molten aluminum monitoring.

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On-Line Monitoring of Liquid Magnesium using a High Temperature Ultrasonic Probe

Cited by 6 publications

References 0 publications

<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

<I>In Situ</I> Observations of Solidification and Melting of Aluminum Alloy Using Ultrasonic Waveguide Sensor

In Situ Monitoring of Growth Interfaces: A Review of Noninvasive Methods

Ultrasonic in-situ monitoring of solidification and melting behaviors of an aluminum alloy

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