There is tremendous interest in the development of highly wear‐resistant coatings for metallic materials to reduce energy loss and prolong service life. In this study, the authors propose an approach to develop nanocomposite coatings featuring deformable nanocrystals embedded in amorphous matrix for self‐lubrication and superior wear resistance. The dual‐layered nanocomposite coatings are prepared by plasma electrolytic oxidation (PEO) on a Ti‐Nb‐Ta‐Zr‐Hf (TNZTH) refractory multi‐principal element alloy (RMPEA) and commercially pure Ti (cpTi). The inner layers of PEO coatings are composed of substrate element oxides (amorphous TNZTH─O oxide or anatase TiO2), while their outer layers exhibit typical nanocomposite structures. Different from the cpTi‐based PEO coating outer layers composed of brittle rutile TiO2 nanoparticles dispersed in an amorphous matrix of SiO2 and Na2O·nSiO2, the outer layers of TNZTH‐based PEO coatings are featured by deformable Na2Zr(Hf)O3 nanocrystals heterogeneously embedded in an inhomogeneous amorphous matrix composed of TNZTH─O oxide, SiO2, and Na2O·nSiO2. As a result, the TNZTH‐based PEO coatings exhibit favorable self‐lubricating performance and superior wear resistance, while the cpTi‐based PEO coatings are completely destroyed after sliding wear. Thus, this study offers valuable insights into the design and development of self‐lubricating coatings with superior wear resistance for metallic materials.

中文翻译：

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Ti-Nb-Zr-Ta-Hf 难熔多主元合金上具有异质纳米复合结构的优异自润滑涂层


人们对开发用于金属材料的高耐磨涂层以减少能量损失并延长使用寿命有着极大的兴趣。在这项研究中，作者提出了一种开发纳米复合涂层的方法，该涂层具有嵌入非晶基体中的可变形纳米晶体，具有自润滑和卓越的耐磨性。双层纳米复合涂层是通过等离子体电解氧化（PEO）在Ti-Nb-Ta-Zr-Hf（TNZTH）耐火多主元合金（RMPEA）和商业纯Ti（cpTi）上制备的。 PEO涂层的内层由基体元素氧化物（非晶态TNZTH─O氧化物或锐钛矿TiO2）组成，而其外层则呈现出典型的纳米复合结构。与由分散在 SiO2 和 Na2O·nSiO2 无定形基质中的脆性金红石 TiO2 纳米颗粒组成的 cpTi 基 PEO 涂层不同，TNZTH 基 PEO 涂层的外层由可变形的 Na2Zr(Hf)O3 纳米晶体异质嵌入由TNZTH─O氧化物、SiO2和Na2O·nSiO2组成的非均匀非晶基质。结果，TNZTH基PEO涂层表现出良好的自润滑性能和优异的耐磨性，而cpTi基PEO涂层在滑动磨损后完全被破坏。因此，这项研究为金属材料具有优异耐磨性的自润滑涂层的设计和开发提供了宝贵的见解。