Enhanced mechanical and thermal shock performance by oxygen competition in plasma sprayed coating

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-03-24 DOI:10.1016/j.materresbull.2025.113450

Shuai Zhang , Zhiqiang Li , Fei Li , Rui Xu , Gaotian Yin , Hui Li , Nana Zhao , Shufeng Liu , Fei Lu , Liqing Wang , Song Ma

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Abstract

Al₂O₃–13 wt.% TiO₂ (AT13) coating is a significant ceramic coating in surface protection of key mechanical metal components such as plunger pumps, bearings, and turbine blades. However, the existence of the soft phase Al₂TiO₅ severely weakens the mechanical and thermal shock performance of the AT13 coating. With the modulating character of the oxygen partial pressure alteration induced by Ce³⁺/Ce⁴⁺ redox couple, the variable valence rare earth oxide CeO₂ as a reinforcing assistant additive in AT13 coatings with different weight percentages to form a new type of AT13/CeO₂ composite coating. With the increase of the CeO₂ in the composite, the porosity and structural flaws of the coatings are greatly decreased, leading to an increase in their lubrication and chemical stability. Therefore, significantly enhanced mechanical properties and shock performance have been noted in the AT13/CeO₂ coating. Under dry sliding conditions, the tribological test revealed that the anti-wear rate and anti-friction increased by 47 % and 18 % in the AT13/CeO₂ coating, respectively. The thermal shock resistance of AT13/CeO₂ coatings increases more than 6 times that of AT13 coating. Introducing variable valence rare earth oxide CeO₂ supplies a new preparation strategy for improving the ceramic coating.

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通过氧竞争提高等离子喷涂涂层的机械和热冲击性能

TiO2 （AT13）涂层是一种重要的陶瓷涂层，用于关键机械金属部件的表面保护，如柱塞泵、轴承和涡轮叶片。然而，软相Al2TiO5的存在严重削弱了AT13涂层的力学性能和热冲击性能。利用Ce3+/Ce4+氧化还原对氧分压变化的调节特性，在AT13涂层中加入不同重量百分比的变价稀土氧化物CeO2作为补强辅助添加剂，形成了新型的AT13/CeO2复合涂层。随着复合材料中CeO2含量的增加，涂层的孔隙率和结构缺陷大大减少，从而提高了涂层的润滑性能和化学稳定性。因此，AT13/CeO2涂层的机械性能和冲击性能得到了显著提高。在干滑动条件下，AT13/CeO2涂层的抗磨率和抗摩擦率分别提高了47 %和18 %。AT13/CeO2涂层的抗热震性能是AT13涂层的6倍以上。变价稀土氧化物CeO2的引入为改善陶瓷涂层提供了一种新的制备策略。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.