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HVOF-sprayed WC-CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

机译：铝合金上的HVOF喷涂WC-CoCr涂层：涂层厚度对摩擦学性能的影响

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摘要

The microstructure, the micromechanical properties, the wear behaviour and the impact resistance of WC-CoCr cermet coatings, deposited onto an aluminium alloy substrate by High Velocity Oxygen-Fuel (HVOF) flame-spraying, were examined as a function of the coating thickness, which was varied between 50 μm and 150 μm by performing different numbers of scans of the HVOF torch in front of the substrate. The coatings became denser and significantly harder as the number of torch scans increased: the analysis of single WC-CoCr splats by combined SEM and Focused Ion Beam (FIB) techniques enabled the interpretation of the mechanisms underlying this phenomenon. In accordance to such densification, the sliding wear resistance increased with the number of torch scans, as abrasive grooving and brittle failure mechanisms were progressively suppressed. The resistance to cyclic impact was also enhanced. In comparison to anodised films, the WC-CoCr coatings appeared much more resistant against wear and cyclic impact; specifically, three torch scans seem enough to produce a coating having suitable characteristics. © 2009 Elsevier B.V. All rights reserved.
机译：研究了通过高速氧气-燃料（HVOF）火焰喷涂沉积到铝合金基材上的WC-CoCr金属陶瓷涂层的微观结构，微机械性能，磨损行为和耐冲击性，它是涂层厚度的函数，通过对基板前的HVOF炬进行不同的扫描次数，可以在50μm和150μm之间变化。随着割炬扫描次数的增加，涂层变得更致密，并且变得更加坚硬：通过结合SEM和聚焦离子束（FIB）技术对单个WC-CoCr splats进行分析，可以解释这种现象的潜在机理。根据这样的致密化，随着逐渐减少磨料开槽和脆性破坏机理，滑动耐磨性随着焊炬扫描的次数而增加。抗周期性冲击的能力也增强了。与阳极氧化膜相比，WC-CoCr涂层似乎具有更好的抗磨损和抗周期性冲击性能。特别地，三个火炬扫描似乎足以产生具有合适特性的涂层。 ©2009 Elsevier B.V.保留所有权利。

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