High power continuous wave laser heating of graphite in a high temperature range up to 3800 K - Archive ouverte HAL
Article Dans Une Revue Journal of Applied Physics Année : 2021

High power continuous wave laser heating of graphite in a high temperature range up to 3800 K

Résumé

As graphite is an important material for several applications, the evaluation of its properties at very high temperatures is of major importance. Conducting studies at temperatures >2800 K is, however, very challenging, and the amount of available data in the literature is, therefore, very limited. This paper presents a methodology that compares experimental data with simulation results following a progressive increase of the temperature range investigated. The study was conducted on a commercial polycrystalline graphite produced by sintering (EDM-3 from POCO) under high power continuous laser heating (kW ytterbium at a wavelength of 1080 nm). Experiments were done inside a vacuum chamber equipped with pyrometers and cameras allowing fine monitoring of the temperature of the samples. A 3D numerical model has been developed based on the finite element method to analyze the experimental results. The evolution of the thermal and optical properties of EDM-3 with temperature is required for correctly modeling laser/material interactions. By running a sequential comparison of calculation with a dedicated experiment, we achieve better knowledge of such properties. From this study, we obtain estimations of the evolution of thermal conductivity, emissivity, and evaporation rate up to 3800 K of amorphous graphite.
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Dates et versions

hal-03466241 , version 1 (25-02-2022)

Identifiants

Citer

L. Gallais, T. Vidal, E. Lescoute, Y. Pontillon, J. Rullier. High power continuous wave laser heating of graphite in a high temperature range up to 3800 K. Journal of Applied Physics, 2021, 129 (4), pp.043102. ⟨10.1063/5.0033530⟩. ⟨hal-03466241⟩
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