Microstructure and wear resistance of molybdenum based amorphous nanocrystalline alloy coating fabricated by atmospheric plasma spraying
X.B. Zhao, Z.H. Ye
Surface & Coatings Technology
abstract
Molybdenu m (Mo) based amorpho us nanocrystalline coating was deposited on the surface of plain carbon steel substrates by atmospheric plasma spraying (APS). X-ray diffraction (XRD) and scanning electron mi-croscopy (SEM)were used to characterize the microstructures of Mo-based powder and coating. The surface hardness of substrate and coating were determined using a Vickers hardness tester, and m icrohardness pro-fi le of cross-section was realized by a Vickers microhardness tester. Wear tests were carried out using a pin on plate type tester by changing the load and linear speed. The results indicated that the as-prepared Mo-based coating was mainly composed of Fe0.54Mo0.73,Fe
3Mo, Cr9Mo21Ni20,Fe3B and Cr0.46 Mo.4Si0.14phases.The avera ge grain size of Mo-based coating was 22– 32 nm. The coating presented a dense layered structure and its thickness was about 250 μ m. The surface hardness of Mo-based coating was as high as 9.2 GPa, which was 8 times of substrate. The microhardness along the cross-section gradually decreased from coating to sub-strate. The wear resistance of Mo-based coating was far better than that of substrate.
keywords: Plasma spraying,Molybdenum based coating,Amorphous,Nanocrystalline,Wear resista nce
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