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Abrupt Increase of the Absorption Coefficient of Alumina at Melting by Laser Radiation and Its Decrease at Solidification

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Abstract

Experimental data for the normal-hemispherical reflectivity R of remolded aluminum oxide ceramics for wavelengths of (0.488, 0.6328, 1.15, and 3.39) μm and effective (radiance) temperatures T eff1 and T eff2 for wavelengths of 0.55 μm and 0.72 μm were obtained in the process of rapid subsecond heating by CO2 laser radiation in air and vacuum from room temperature to the formation of thin molten layers of 0.6 mm to 0.7 mm thickness and of subsequent rapid free cooling with solidification of the melt when the laser radiation was blocked. Experimentally and by numerical simulation of combined radiation and conduction heat transfer, the influence of the heating radiation flux on the formation of the thin melt on the surface of ceramics with an abrupt increase of T eff1 and T eff2 and on the signal of the spectrometer in the infrared range from 2 μm to 11 μm at melting and on its decrease at solidification were studied. The radiation heat flux varied from 500 W · cm−2 to 2000 W · cm−2. It is shown that the determining effect on the temperature field and on the intensity of outgoing radiation is caused by the formation of the isothermal continuous two-phase zone and the abrupt increase (decrease) of the absorption coefficient of the melt. The importance of kinetics in the abrupt change of the absorption coefficient of molten Al2O3 is noted.

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  1. Moscow State Institute of Radio Engineering, Electronics, and Automation (Technical University), 78, Prospekt Vernadskogo, Moscow, 119454, Russia

    Vadim A. Petrov

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  1. Vadim A. Petrov
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Petrov, V.A. Abrupt Increase of the Absorption Coefficient of Alumina at Melting by Laser Radiation and Its Decrease at Solidification. Int J Thermophys 30, 1938–1959 (2009). https://doi.org/10.1007/s10765-009-0678-z

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  • DOI: https://doi.org/10.1007/s10765-009-0678-z

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