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Correlation of microstructure with tribological properties in atmospheric plasma sprayed Mo-added ferrous coating.

Authors :
Lee, Illjoo
Park, Hyungkwon
Kim, Jaeick
Lee, Changhee
Source :
Surface & Coatings Technology. Dec2016 Part A, Vol. 307, p908-914. 7p.
Publication Year :
2016

Abstract

Heavy steel automotive parts have been replaced with aluminum-based lightweight materials worldwide. In particular, grey cast iron engine blocks, which are very heavy components in vehicles, have been replaced by aluminum-silicon hypoeutectic alloys in order to reduce emissions and fuel consumption. However, aluminum alloys are not able to withstand severe engine cylinder conditions due to their poor mechanical properties. In this study, a Mo blended ferrous coating was fabricated using atmospheric plasma spraying to replace the grey cast iron liner in the automotive cylinder bore. Five fractions of Mo, 0, 5, 10, 15, and 20 wt%, with ferrous powder were prepared to investigate the effect of Mo on the microstructure and mechanical properties of coatings. All of the Mo-added coating layers showed significantly improved mechanical properties, such as hardness and wear resistance compared to that of grey cast iron. However, as Mo content exceeded 10 wt% of the blend, the tribological properties gradually degraded due to brittle fracture of Mo. As a result, 10 wt% Mo blended with ferrous powder provided optimized mechanical properties and can be substitute for grey cast iron liners in the automotive industry. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02578972
Volume :
307
Database :
Academic Search Index
Journal :
Surface & Coatings Technology
Publication Type :
Academic Journal
Accession number :
119776744
Full Text :
https://doi.org/10.1016/j.surfcoat.2016.09.074