Abstract
Molybdenum disilicide (MoSi2)-based composite coating using nano-ZrO2 as an additive was deposited on a nickel-based alloy by air plasma spraying, and the phase composition and microstructure of the composite coating were characterized by x-ray diffraction (XRD) and scanning electron microscope. The high-temperature abrasive wear properties of the ZrO2-MoSi2 composite coating were compared with the pure MoSi2 coating at 1100 °C. The XRD results show that there exists mutual transformation between T-MoSi2 and H-MoSi2 phase and part of Mo-rich phases are formed because of oxidization during the spraying processing. The addition of nano-ZrO2 could improve the adhesion between the splats, prevent cracking along the interface between the splats, and purify the boundaries. The ZrO2-MoSi2 composite coating exhibits improved wear resistance compared with the pure MoSi2 coating. The addition of nano-ZrO2 could effectively mitigate the adhesion wear and brittle delamination of the MoSi2 coating.
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