THERMAL SCIENCE

International Scientific Journal

MONITORING OF A CERAMIC SURFACE TEMPERATURE FIELD INDUCED BY PULSED ND:YAG LASER

ABSTRACT
Temperature distribution induced by laser radiation is a very important parameter for an efficient and safe application of lasers in different ceramic processing techniques. This paper presents the results of an infrared thermography application for monitoring temperature distribution on a ceramic surface during Nd:YAG laser irradiation with different fluences and 8ns pulse duration. The FLIR, E40 and SC7200 infrared cameras were used with the aim of recording the maximum temperature in the irradiated zones. It was expected that infrared thermography could give some information related to the heat affected zone and possible damage to the base material. However, the results have shown that infrared cameras, even those with high performance such as SC7200, cannot record the maximum temperature value at the moment of laser operation, but only the average temperature of the bulk sample material after laser pulses. The results of the numerical simulation have confirmed the value of the thermographic measurements. The micro-structure and micromorphology of the ceramic surface before and after the laser treatment were analysed by optical and SEM as well as by examining the roughness of the irradiated and non-irradiated surfaces, while the micro-mechanical changes were analysed by comparing the micro-hardness of the irradiated and non-exposed surfaces.
KEYWORDS
PAPER SUBMITTED: 2019-08-11
PAPER REVISED: 2019-10-20
PAPER ACCEPTED: 2019-11-02
PUBLISHED ONLINE: 2019-11-17
DOI REFERENCE: https://doi.org/10.2298/TSCI190811425K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [567 - 578]
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© 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence