Microstructure and wear resistance of molybdenum based amorphous nanocrystalline alloy coating fabricated by atmospheric plasma spraying
Microstructure and wear resistance of molybdenum based amorphous nanocrystalline alloy coating fabricated by atmospheric plasma spraying
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DOI：
10.1016/j.surfcoat.2012.05.127
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发表时间：
2013-08
影响因子：
5.4
通讯作者：
X. Zhao;Z. Ye
中科院分区：
文献类型：
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作者：
X. Zhao;Z. Ye
采用大气等离子喷涂技术在碳钢基体上制备了钼基非晶纳米晶涂层。采用X射线衍射（XRD）和扫描电镜（SEM）对钼基粉末和涂层的微观结构进行了表征。用维氏硬度计测定了基体和涂层的表面硬度，用维氏显微硬度计获得了涂层横截面的显微硬度分布。通过改变载荷和线速度，使用销盘式试验机进行磨损试验。结果表明，所制备的钼基涂层主要由Fe0.54Mo0.73、Fe 3 Mo、Cr 9 Mo 21 Ni 20、Fe 3B和Cr0.46Mo.4Si0.14相组成。Mo基涂层的平均晶粒尺寸为22- 32 nm。涂层呈致密的层状结构，厚度约为250μm。Mo基涂层的表面硬度高达9.2GPa，是基体的8倍。从涂层到基体，涂层横截面上的显微硬度沿着逐渐降低。钼基涂层的耐磨性远优于基体。
Molybdenum (Mo) based amorphous nanocrystalline coating was deposited on the surface of plain carbon steel substrates by atmospheric plasma spraying (APS). X-ray diffraction (XRD) and scanning electron microscopy (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 microhardness profile 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, Fe3Mo, Cr9Mo21Ni20, Fe3B and Cr0.46Mo.4Si0.14phases. The average grain size of Mo-based coating was 22–32nm. The coating presented a dense layered structure and its thickness was about 250μm. The surface hardness of Mo-based coating was as high as 9.2GPa, which was 8 times of substrate. The microhardness along the cross-section gradually decreased from coating to substrate. The wear resistance of Mo-based coating was far better than that of substrate.