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Open AccessArticle

Enhanced XRF Methods for Investigating the Erosion-Resistant Functional Coatings

National Institute for Laser, Plasma and Radiation Physics (NILPRP), 077125 Bucharest, Romania
Doctoral School of Science and Material Engineering, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
Author to whom correspondence should be addressed.
Coatings 2019, 9(12), 847;
Received: 14 November 2019 / Revised: 6 December 2019 / Accepted: 9 December 2019 / Published: 10 December 2019
(This article belongs to the Section Surface Characterization, Deposition and Modification)
The development of erosion-resistant functional materials usable as plasma facing first wall components (PFC) is crucial for increasing the lifetime of future fusion reactors. Generally, PFCs have to be quality checked and characterized regarding their composition, before integrating them into the fusion reactor vessel. Enhanced X-ray fluorescence (XRF) methods represent an effective alternative to conventional analysis methods for the characterization of refractive metallic coatings on large areas of fusion materials. We have developed and applied XRF methods as fast and robust methods for the characterization of the thickness and composition uniformity of complex functional coatings. These coatings consist of tungsten included in multilayer configuration and deposited on low or high Z substrates. We have further developed customized calibration protocols for quantifying the element composition and layer thickness of each investigated sample. The calibration protocols are based on a combination of standard samples measurements, Monte Carlo simulations, and fundamental parameter theoretical calculations. The calibrated results are discussed considering a selection of relevant PFC samples. The deposition uniformity was successfully investigated for different PFC-relevant tiles and lamella shaped samples with W layers below and over the W L-line saturation thickness. Also, the 2D thickness mapping capability of the XRF method was demonstrated by studying the plasma post-erosion pattern. View Full-Text
Keywords: X-Ray fluorescence; K-line; fundamental parameter; Monte Carlo simulations; multi-layer; thin films X-Ray fluorescence; K-line; fundamental parameter; Monte Carlo simulations; multi-layer; thin films
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Lungu, M.; Dobrea, C.; Tiseanu, I. Enhanced XRF Methods for Investigating the Erosion-Resistant Functional Coatings. Coatings 2019, 9, 847.

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