Wear Mechanism and Lubrication State of Plasma-Sprayed Cr2O3 Coating Against SiC Bulk Under Water Lubrication

Abstract

Abstract: Friction and wear properties of plasma-sprayed Cr₂O₃ coating against SiC bulk at different loads and sliding velocities under
water lubrication were investigated . Worn surfaces and wear debris were examined by means of SEM and XPS. The aim was to reveal wear mechanism and
lubrication state of the pairs under different testing conditions. The results obtained indicate that friction coefficients and wear coefficients
for Cr₂O₃ coating and SiC bulk pairs are quite low. Wear mechanism of Cr₂O₃ coating is microfracture along the borders of pores and
plastic deformation, and wear mechanism of SiC bulk is formation of SiO₂ through tribochemical reaction and dissolution of SiO₂ in water. Wear
mechanisms of Cr₂O₃ coating and SiC bulk are steady upon normal loads and sliding velocities. The pairs are in boundary lubrication state
at low velocities and high loads and in partial elasto-hydrodynamic lubrication either at high velocities or at low loads.

Key words: plasma-sprayed chromium oxide coating, silicon carbide bulk, wear mechanism, lubrication

CLC Number:

TQ163

ZHENG Xue-Bin,HUANG Min-Hui,CHEN Zhong-Ming,TAN Shou-Hong,XIA Ji-Yu,DING Chuan-Xian. Wear Mechanism and Lubrication State of Plasma-Sprayed Cr₂O₃ Coating Against SiC Bulk Under Water Lubrication[J]. Journal of Inorganic Materials.

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Wear Mechanism and Lubrication State of Plasma-Sprayed Cr₂O₃ Coating Against SiC Bulk Under Water Lubrication

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