Effects of Mo Element on Microstructure and Friction Properties of Thermal Spraying Iron-Based Coating

ZHANG Haiyu; WANG Furong; WANG Zhidong; DU Shuangming; LIU Eryong

doi:10.3969/j.issn.1001-2222.2021.04.009

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (4) : 57. DOI: 10.3969/j.issn.1001-2222.2021.04.009

Effects of Mo Element on Microstructure and Friction Properties of Thermal Spraying Iron-Based Coating

ZHANG Haiyu¹,WANG Furong^1,2,WANG Zhidong³,DU Shuangming¹,LIU Eryong¹

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Abstract

In order to solve the problem of poor wear resistance of aluminum alloy engine body, iron-based coating (XPT-512-Mo) with different Mo content was prepared on the surface of aluminum alloy by plasma spraying technology. The effects of Mo element on the microstructure and tribological properties of coating were studied. The results show that XPT-512-Mo iron-based coating is mainly composed of ferrite (F) and Mo phase and its cross-section morphology presents a typical thermal spraying coating structure. The tribological properties indicate that the wear rate of XPT-512-Mo coating decreases with the addition of metal Mo under dry friction or oil lubrication condition. The coating with low Mo content like XPT-512-30Mo hence has the optimal wear performance. The composite oxide film of MoO₃ and Fe₃O₄ has formed on the worn surface of coating, which acts as the role of collaborative lubrication and plays a significant role in lubrication and antifriction.

Key words

plasma spraying / iron-based coating / friction / wear / collaborative lubrication

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ZHANG Haiyu,WANG Furong,WANG Zhidong,DU Shuangming,LIU Eryong. Effects of Mo Element on Microstructure and Friction Properties of Thermal Spraying Iron-Based Coating[J]. Vehicle Engine. 2021, 0(4): 57 https://doi.org/10.3969/j.issn.1001-2222.2021.04.009