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Sample temperature effect on laser ablation and analytical capabilities of laser induced breakdown spectroscopy

Abstract

The influence of sample temperature on laser ablation process and analytical capabilities of laser induced breakdown spectroscopy (LIBS) were studied systematically. We were interested in estimating analytical capabilities of LIBS probe which was developed for in situ elemental analysis of cladding spot (molten metals) during metal parts production by additive manufacturing. Sample surface was heated locally (4 mm diameter spot) in argon atmosphere by powerful continuous wave fiber laser while nanosecond laser ablated only a small spot (0.3 mm diameter) in the high temperature area. This procedure can be utilized for high temperature LIBS studies of any samples including materials with high melting temperatures (tungsten, aluminum oxide etc.). Low alloy steel samples were heated up to melting point and LIBS experiments were carried out in wide temperature range (25-1600 0C). LIBS plasma imaging revealed that size and brightness of expanding plume did not depend on solid sample temperature but these parameters increased manifold for molten steel ablation. Comparison of plasma emissivity, temperature and electron density did not reveal any meaningful differences in case of LIBS measurements for room temperature (25 0C), hot solid (1050 0C) and molten (1550 0C) targets thus enhanced plasma emissivity was explained by greater ablation rate. Surface temperature impact on LIBS analytical capabilities was studied by comparing calibration curve linearity, limits of detection and the root mean square error of cross-validation for chromium, silicon and manganese. High temperature of the sample surface favored for greater atomic/ionic lines emission but molten sample LIBS analysis revealed poor limits of detection for all elements, which was explained by strong fluctuations of laser ablation process at liquid metal surface.

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Publication details

The article was received on 19 Oct 2018, accepted on 04 Dec 2018 and first published on 04 Dec 2018


Article type: Technical Note
DOI: 10.1039/C8JA00348C
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    Sample temperature effect on laser ablation and analytical capabilities of laser induced breakdown spectroscopy

    V. N. Lednev, M. Ya. Grishin, P. A. Sdvizhenskii, R. D. Asyutin, R. S. Tretyakov, A. Y. Stavertiy and S. M. Pershin, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00348C

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