The set up of reliable models of technological processes requires the availability of accurate data on the thermophysical behaviour of materials. A key-role, in several manufacturing processes, is played by thermal conductivity, which is significantly affected by temperature. This paper presents an experimental work carried out on Aluminium casting alloys, aimed at evaluating their thermal conductivity from room temperature up to 450°C. The approach followed consists in the measurement of electrical resistivity of alloys, by means of a properly developed device, suitable also for high temperatures, and in their conversion into thermal conductivity data using the well-known Wiedemann-Franz-Lorenz correlation. The “calibration” of the Lorenz’s number, with reference to Al-Si alloys is described, and both the electrical and thermal data are compared with literature available, showing a good agreement.
EVALUATION OF THERMOPHYSICAL PROPERTIES IN ALUMINIUM ALLOYS
BONOLLO, FRANCO;
2001
Abstract
The set up of reliable models of technological processes requires the availability of accurate data on the thermophysical behaviour of materials. A key-role, in several manufacturing processes, is played by thermal conductivity, which is significantly affected by temperature. This paper presents an experimental work carried out on Aluminium casting alloys, aimed at evaluating their thermal conductivity from room temperature up to 450°C. The approach followed consists in the measurement of electrical resistivity of alloys, by means of a properly developed device, suitable also for high temperatures, and in their conversion into thermal conductivity data using the well-known Wiedemann-Franz-Lorenz correlation. The “calibration” of the Lorenz’s number, with reference to Al-Si alloys is described, and both the electrical and thermal data are compared with literature available, showing a good agreement.
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