Microstructure and tribological properties of plasma-sprayed chromium oxide-molybdenum oxide composite coatings

Authors
Lyo, IWAhn, HSLim, DS
Issue Date
2003-01-30
Publisher
ELSEVIER SCIENCE SA
Citation
SURFACE & COATINGS TECHNOLOGY, v.163, pp.413 - 421
Abstract
Plasma-sprayed composite coatings of Cr2O3-MoO3 were studied to identify their microstructure and to understand the influence of molybdenum oxide composition in the coatings on their tribological behavior. Cr2O3-MoO3 composite powders and Cr2O3 powders were fabricated using a spray-drying method and plasma-sprayed coatings of these powders were produced to evaluate their tribological performance. Wear tests were conducted with a reciprocating motion at room temperature and 450 degreesC under dry sliding condition. Measurement of friction coefficient was made in association with the sliding cycle. The physical characteristics of surfaces were investigated by scanning electron microscopy and chemical composition of the coating surfaces was analyzed using a X-ray photoelectron spectrometer and a transmission electron microscope (TEM). The study showed that the microhardness of coatings containing MoO3 were higher than that composed of Cr2O3 alone. The result of TEM analysis indicated that chromium/molybdenum was precipitated in the grain and grain boundary. The friction coefficients of the MoO3-added coatings were lower than that without MoO3 addition at both test temperatures. However, the addition of MoO3 in the Cr2O3 coatings did not significantly improve the wear performance of the coatings at both test temperatures. Dispersed smooth films were formed in the worn surface for all coatings. These wear protecting layers, formed by plastic deformation of adhered and compacted debris particles to the surface, strongly influence the friction of the coatings as already observed by the authors with different plasma-sprayed coatings. The chemical composition of these films varied depending on the test temperature. (C) 2002 Elsevier Science B.V. All rights reserved.
Keywords
DIESEL-ENGINES; BEHAVIOR; FILMS; MO; DIESEL-ENGINES; BEHAVIOR; FILMS; MO; plasma-sprayed Cr2O3-MoO3 composite coatings; friction and wear; surface films; transmission electron microscopy; X-ray photoelectron spectroscopy
ISSN
0257-8972
URI
https://pubs.kist.re.kr/handle/201004/138902
DOI
10.1016/S0257-8972(02)00613-8
Appears in Collections:
KIST Article > 2003
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