Synergistic lubrication effect of OLC and MoDTC for reducing friction and wear of MAO ceramic coating on TC4 alloy

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-07-17 DOI:10.1111/ijac.14859

Yang Li, Xiao Bai, Dejian Zhang, Huilai Sun, Zhengang Guo, Shuyan Yang, Yong Wan

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Abstract

TC4 titanium alloy has been widely used in the automotive field due to its exceptional properties. However, inherent defects such as low hardness and poor wear resistance for TC4 alloy limited its wider application. The microarc oxidation (MAO) technique was employed in this paper to prepare MAO coatings on TC4 titanium alloy. The microstructure, phase structure, mechanical properties, and tribological performance were systematically evaluated. The results show that the coating contains a large amount of rutile TiO₂ hard phase after MAO treatment, which significantly improves the mechanical properties of the substrate. The hardness of the MAO coating can reach 581 HV_.05. Furthermore, the synergistic lubrication effect of onion-like carbon (OLC) nanoparticles and organic molybdenum dithiocarbamate (MoDTC) in PAO oil was observed for MAO-treated TC4. Particularly, when .01 wt.% OLC is used with 1 wt.% MoDTC oil, the coefficient of friction (COF) decreases to .062, and the wear rate decreases to 4.3 × 10⁻⁷ mm³/Nm. Combined Raman and X-ray photoelectron spectroscopy (XPS) analysis indicate that OLC is deposited on coating area to form a lubricating carbon film. Additionally, OLC can promote the decomposition of MoDTC during sliding to generate a tribofilm containing MoS₂.

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OLC 和 MoDTC 在减少 TC4 合金 MAO 陶瓷涂层的摩擦和磨损方面的协同润滑效果

TC4 钛合金因其优异的性能而被广泛应用于汽车领域。然而，TC4 合金硬度低、耐磨性差等固有缺陷限制了它的广泛应用。本文采用微弧氧化（MAO）技术制备了 TC4 钛合金的 MAO 涂层。系统地评估了涂层的微观结构、相结构、机械性能和摩擦学性能。结果表明，经 MAO 处理后的涂层含有大量金红石型 TiO2 硬相，可显著提高基体的机械性能。MAO 涂层的硬度可达 581 HV.05。此外，在 MAO 处理过的 TC4 中还观察到了 PAO 油中洋葱状碳（OLC）纳米粒子和有机二硫代氨基甲酸钼（MoDTC）的协同润滑效果。特别是当 0.01 wt.% OLC 与 1 wt.% MoDTC 油一起使用时，摩擦系数 (COF) 降至 0.062，磨损率降至 4.3 × 10-7 mm3/Nm。拉曼光谱和 X 射线光电子能谱（XPS）分析表明，OLC 沉积在涂层区域，形成一层润滑碳膜。此外，OLC 还能促进 MoDTC 在滑动过程中分解，生成含有 MoS2 的三膜。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;