Due to lack of reliable data of thermal diffusivity of sintered steels in literature, experimental investigations were conducted on samples made of different powder types (based on prealloyed, or diffusion-bonded, or admixed powders) and under different process conditions. So the influence of pressing pressure and sintering temperature on thermal diffusivity was established. Thermal diffusivity was measured using the "flash method", where a sample in the shape of a slab is irradiated with a light pulse on one of the two surfaces and temperature of the other surface is detected by an ambient temperature pyrometer. The value of the thermal diffusivity is obtained by least squares regression on the entire trend of the temperature vs. time using the analytical solution of the heat conduction as regression model. Results show the increase of the thermal diffusivity with increasing density. This outcome can be explained from the mutual effect of thermal conductivity and density on thermal diffusivity in porous media. The experimental results have also permitted to verify the influence of the composition of the sintered materials and carbon contents on thermal diffusivity.

Bocchini, G., Bovesecchi, G., Coppa, P., Corasaniti, S., Montanari, R., & Varone, A. (2016). Thermal Diffusivity of Sintered Steels with Flash Method at Ambient Temperature. INTERNATIONAL JOURNAL OF THERMOPHYSICS, 37:38(4), 1-14 [10.1007/s10765-016-2050-4].

Thermal Diffusivity of Sintered Steels with Flash Method at Ambient Temperature

BOVESECCHI, GIANLUIGI;COPPA, PAOLO;CORASANITI, SANDRA;MONTANARI, ROBERTO;Varone, A.
2016

Abstract

Due to lack of reliable data of thermal diffusivity of sintered steels in literature, experimental investigations were conducted on samples made of different powder types (based on prealloyed, or diffusion-bonded, or admixed powders) and under different process conditions. So the influence of pressing pressure and sintering temperature on thermal diffusivity was established. Thermal diffusivity was measured using the "flash method", where a sample in the shape of a slab is irradiated with a light pulse on one of the two surfaces and temperature of the other surface is detected by an ambient temperature pyrometer. The value of the thermal diffusivity is obtained by least squares regression on the entire trend of the temperature vs. time using the analytical solution of the heat conduction as regression model. Results show the increase of the thermal diffusivity with increasing density. This outcome can be explained from the mutual effect of thermal conductivity and density on thermal diffusivity in porous media. The experimental results have also permitted to verify the influence of the composition of the sintered materials and carbon contents on thermal diffusivity.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/10 - Fisica Tecnica Industriale
Settore ING-IND/21
eng
density, thermal diffusivity, thermal conductivity, sintered steels
Bocchini, G., Bovesecchi, G., Coppa, P., Corasaniti, S., Montanari, R., & Varone, A. (2016). Thermal Diffusivity of Sintered Steels with Flash Method at Ambient Temperature. INTERNATIONAL JOURNAL OF THERMOPHYSICS, 37:38(4), 1-14 [10.1007/s10765-016-2050-4].
Bocchini, G; Bovesecchi, G; Coppa, P; Corasaniti, S; Montanari, R; Varone, A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/155479
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