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首页> 外文期刊>Surface & Coatings Technology >Microstructure and tribological properties of plasma-sprayed chromium oxide-molybdenum oxide composite coatings
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Microstructure and tribological properties of plasma-sprayed chromium oxide-molybdenum oxide composite coatings

机译：等离子喷涂氧化铬-氧化钼复合涂层的组织和摩擦学性能

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Plasma-sprayed composite coatings of Cr2O3-MoO3 were studied to identify their microstructure and to understand the influence of molybdenum oxide composition in the coatings on their tribological behavior. Cr2O3-MoO3 composite powders and Cr2O3 powders were fabricated using a spray-drying method and plasma-sprayed coatings of these powders were produced to evaluate their tribological performance. Wear tests were conducted with a reciprocating motion at room temperature and 450 degreesC under dry sliding condition. Measurement of friction coefficient was made in association with the sliding cycle. The physical characteristics of surfaces were investigated by scanning electron microscopy and chemical composition of the coating surfaces was analyzed using a X-ray photoelectron spectrometer and a transmission electron microscope (TEM). The study showed that the microhardness of coatings containing MoO3 were higher than that composed of Cr2O3 alone. The result of TEM analysis indicated that chromium/molybdenum was precipitated in the grain and grain boundary. The friction coefficients of the MoO3-added coatings were lower than that without MoO3 addition at both test temperatures. However, the addition of MoO3 in the Cr2O3 coatings did not significantly improve the wear performance of the coatings at both test temperatures. Dispersed smooth films were formed in the worn surface for all coatings. These wear protecting layers, formed by plastic deformation of adhered and compacted debris particles to the surface, strongly influence the friction of the coatings as already observed by the authors with different plasma-sprayed coatings. The chemical composition of these films varied depending on the test temperature. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 22]
机译：研究了等离子喷涂的Cr2O3-MoO3复合涂层的微观结构，并了解了涂层中氧化钼成分对其摩擦学行为的影响。采用喷雾干燥法制备了Cr2O3-MoO3复合粉和Cr2O3粉，并制备了等离子喷涂涂层，以评价其摩擦学性能。在室温和450℃下在干滑动条件下以往复运动进行磨损测试。结合滑动周期进行摩擦系数的测量。通过扫描电子显微镜研究表面的物理特性，并使用X射线光电子能谱仪和透射电子显微镜（TEM）分析涂层表面的化学组成。研究表明，含MoO3的涂层的显微硬度高于仅由Cr2O3构成的涂层。 TEM分析的结果表明，铬/钼在晶粒和晶界中析出。在两个测试温度下，添加MoO3的涂层的摩擦系数均低于未添加MoO3的涂层。但是，在Cr2O3涂层中添加MoO3并不能在两个测试温度下显着改善涂层的磨损性能。在所有涂层的磨损表面上均形成了分散的光滑膜。这些磨损保护层是由粘附和压实的碎屑颗粒在表面上发生塑性变形而形成的，正如作者已经用不同的等离子喷涂涂层观察到的那样，它们强烈影响涂层的摩擦力。这些膜的化学组成取决于测试温度。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：22]

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