Abstract
In-situ measurements of molten aluminum alloy (Al-12.6%Si) using a high temperature ultrasonic sensor is presented. The developed sensor consists of a conventional piezoelectric transducer and a titanium buffer rod as a probe. A steel reflector is assembled at the probing end to provide normal incident of the ultrasonic wave impinging at the reflector surface. The sustainability of the sensor for long operation time has been investigated. Reflected signals from the steel reflector in the molten aluminum are clearly observed at 800℃. Pulse-echo measurements in the molten aluminum in temperature range from 200 to 800℃ have been performed at 5 MHz, in order to determine the longitudinal wave velocity as a function of temperature. The reflected signal characteristics as well as the velocity variation during melting and solidification of the aluminum alloy have been examined.
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