Home Kovove Materialy-Metallic Materials 2021 Kovove Materialy-Metallic Materials Vol. 59 (2021), no. 4, pp.269–278

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Kovove Materialy-Metallic Materials Vol. 59 (2021), no. 4, pp.269–278

Title: Isothermal oxidation kinetics of laser cladded NiCoCrAl/WC + La2O3 hybrid composite coatings at 700 °C
Author: P. Ashtari, N. Parvinai Ahmadi, S. Yazdani
Abstract: NiCoCrAl/WC + (1–4) wt.% La2O3 coatings were cladded on H13 tool steel using Nd: YAG pulsed laser. Scanning electron microscopy, wavelength dispersive X-ray spectroscopy, electron probe microanalysis, and X-ray diffraction are used to study the coatings and oxide layers. The oxidation kinetics analysis of coatings at 700 °C in a static air atmosphere shows that the oxidation of coatings with La2O3 slows down or stops while a compact and stable oxide layer is formed. The formation of NiCr2O4 spinel makes the oxide layer compact and blocks the connection paths connecting the coating/oxidizing environment. A study of the oxidation mechanism revealed that in coatings with La2O3, short-path diffusion has been preferred due to a fine dendritic microstructure and sufficient opportunity to form NiCr2O4 spinel. Addition of up to 2 wt.% La2O3 makes the coatings effectively resist oxidation. An equation has been derived for the oxidation kinetics using the data analyzed with PythonTM software.
Keywords: kinetics of oxidation, laser cladding, composite coating, high temperature, isothermal oxidation
Published online: 20-Sep-2021
Year: 2021, Volume: 59, Issue: 4 Page From: 269, Page To: 278
doi:10.4149/km_2021_4_269
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