Effect of Vacuum Hot Pressing on Plasma-Sprayed Molybdenum Coatings on Rail Vehicle Axle Steel

Autor:	Chunming Liang, Hui Chen, Hao Ma, M. Yu
Rok vydání:	2019
Předmět:	Materials science Delamination chemistry.chemical_element Tribology engineering.material Condensed Matter Physics Hot pressing Microstructure Surfaces Coatings and Films chemistry Coating Molybdenum Materials Chemistry engineering Lamellar structure Composite material Porosity
Zdroj:	Journal of Thermal Spray Technology. 28:893-903
ISSN:	1544-1016 1059-9630
DOI:	10.1007/s11666-019-00862-4
Popis:	Railway axles suffer severe friction damage during service. In this work, a pure molybdenum coating was prepared on EA4T axle steel by air plasma spraying and hot pressing to improve the steel lifetime. The phase composition, microstructure, hardness, and tribological properties of the coatings were characterized. The results showed that the Mo coating had typical lamellar structure with low porosity and oxidation. Hot pressing compacted the coating and improved the microstructure uniformity. The hardness of the Mo coating and its bonding strength with the substrate were increased after hot pressing under 60 MPa at temperatures ranging between 400 and 500 °C, due to reduced porosity and enhanced mechanical bonding between the coating and substrate. In addition, both the friction coefficient and wear loss of the Mo coating were lower than those of the EA4T steel, illustrating its lubricating effect. Observation of worn surfaces showed that the delamination wear of the Mo coating could be relieved after proper hot pressing due to the strengthened bonding between lamellae.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::04820faf9f69127535e766dc5210b002 https://doi.org/10.1007/s11666-019-00862-4 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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