Abstract
In this work, the detonation spraying approach was implemented to successfully create high-performance CrFeNiAl0.3Ti0.3 high-entropy alloy (HEA) matrix coatings with the incorporation of Ag and (Ca, Ba)F2 eutectic solid lubricants. The microstructure, mechanical and high-temperature tribological performance of this coating were investigated. It was found that the dense lamellar structures and the fine grains resulted in the self-lubricating coating of CrFeNiAl0.3Ti0.3 with a considerable hardness of above 454 HV and a significant good bond strength of above 54 MPa. By adjusting the incorporation content of Ag and (Ca, Ba)F2 solid lubricants with 10 wt%, the composite coating exhibited satisfactory tribological performance from 25 °C to 800 °C, which displays the low friction coefficient of 0.32 ∼ 0.59 and the wear rate of 3.34 ∼ 16.71 × 10−5 mm3/Nm. Especially at 800 °C, an oxide-containing glaze layer formed on the worn surface of the coating, effectively enhancing the tribological performance of the self-lubricating coating.
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