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Rare Metals

Erschienen in:

21.06.2018

High-temperature oxidation behavior of HVOF-sprayed rare earth-modified WC–12Co coating

verfasst von: Zong-Qiu Hang, Nai-Yuan Xi, Yan Liu, Yue Liu, Hui Chen

Erschienen in: Rare Metals | Ausgabe 11/2022

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Abstract

In this study, the CeO₂-modified WC–12Co coatings were deposited on Q345 steel substrate using high-velocity oxygen fuel (HVOF) spraying. Oxidation behavior of the modified coatings was analyzed in the range of 450–900 °C for different oxidation time to investigate the effects of oxidation time and temperature on the coatings. The oxidation kinetics and oxidation mechanism of the modified coatings were clarified. The results show that the oxides are mainly composed of WO₃ and CoWO₄ within 450–750 °C while the phases are different at 900 °C. The CeO₂-modified coatings have good oxidation resistance when the oxidation temperature is below 550 °C and the oxidation mechanism changes due to the occurrence of anomalous oxidation above 650 °C. Moreover, the oxidation mass gain curves obey approximately a parabolic law in the temperature range of 450–650 °C at the initial stage but the later oxidation proceeds by a linear law. In addition, based on the analysis of micromorphology and component of the prepared coating, the role of rare earth (RE) additives is obtained during high-temperature oxidization.

Vorheriger Artikel Cube texture evolution of Ni5W alloy substrates and La–Zr–O buffer layer of YBCO-coated conductors

Nächster Artikel An analytical approach to modeling stress–strain relationship of particle–reinforced metal matrix composites

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Titel: High-temperature oxidation behavior of HVOF-sprayed rare earth-modified WC–12Co coating
verfasst von: Zong-Qiu Hang
Nai-Yuan Xi
Yan Liu
Yue Liu
Hui Chen
Publikationsdatum: 21.06.2018
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 11/2022
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-018-1075-1

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