Taikang Shi , Yao Li , Kuo Zhang , Mengyang Li , Yefei Geng , Xin Zhou , Ting Guo , Yajie Guo , Xiaofeng Dang
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引用次数: 0
Abstract
In this study, Mo-Si-B alloy coatings were in situ laser cladded on pure Mo substrate using cost-effective blended Mo, Si, and B4C powders. Mo-Si-B coatings with minimized solidification defects exhibit a dendritic morphology that consists of coarse α-Mo dendrite cores and fine-grained interdendritic Mo3Si-Mo5SiB2 eutectics, with a small amount of carbides. Compared to the pure Mo substrate, the Mo-Si-B coatings exhibit higher microhardness due to the nanohardness of interdendritic eutectics ~2.4 times greater than the α-Mo phase and showcase superior wear resistance, reducing the coefficient of friction by 72.4% and the wear rate by 39.8%. The enhanced wear resistance of Mo-Si-B coatings is attributed to the presence of hard intermetallic compounds and the formation of a self-lubricating oxidation film.
在本研究中，Mo-Si- b合金涂层采用低成本的Mo、Si和B4C混合粉末在纯Mo基体上原位激光熔覆。凝固缺陷最小的Mo-Si-B涂层呈现出由粗α-Mo枝晶核和细晶枝晶间Mo3Si-Mo5SiB2共晶组成的枝晶形貌，并含有少量碳化物。与纯Mo基体相比，Mo- si - b涂层由于枝晶间共晶的纳米硬度是α-Mo相的2.4倍，具有较高的显微硬度，摩擦系数降低了72.4%，磨损率降低了39.8%。Mo-Si-B涂层的耐磨性增强是由于硬金属间化合物的存在和自润滑氧化膜的形成。
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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