Work

Self-lubrication and enhanced wear and corrosion resistance of calcium silicate hydrate nanostructures on Ti-based micro-arc oxidized coatings

Year: 2025

Type: article

Abstract: Nanostructured coatings for titanium (Ti)-based implants are well-known for their biological properties; however, they are highly fragile in service. The debris generated by wear and coating destruction can lead to chronic inflammatory response, bone resorption, and, consequently, implant loosening. Therefore, the development of highly wear-resistant micro/nanostructured coatings is essential for the long-term service stability of Ti-based implants. In this study, calcium silicate hydrate nanostructures (CSHNs) were generated on micro-arc oxidation (MAO)-treated Ti surfaces via hydrothermal treatment (HT). Owing to the layered crystal feature of the CSHNs, as-prepared micro/nanostructured coatings exhibit typical self-lubricating performance under dry-sliding conditions, with their coefficients of friction measured to be ≤ 0.2. Meanwhile, the appropriate growth of CSHNs on MAO coatings is beneficial for reduced wear rate and enhanced corrosion resistance due to self-lubrication and increased coating crystallinity, respectively. However, in turn, the overgrowth of CSHNs with prolonged HT duration can compromise the wear and corrosion resistance owing to the potential risk of crack formation on MAO coatings. Overall, the results indicate that CSHNs are potential nanostructures for MAO coatings to achieve self-lubrication as well as enhanced wear and corrosion resistance. • CSHNs were fabricated on micro-arc oxidized coatings by hydrothermal treatment. • CSHNs can act as solid lubricant for coatings to realize self-lubrication. • MAO-HT-4h coating exhibits simultaneously promoted wear and corrosion resistance.

Source: Smart Materials in Manufacturing

DOI: 10.1016/j.smmf.2025.100081

Authors: Xinjie Dai, Jingyi He, Yisong Chen, Ao Fu, Wei Zhang, Qianli Huang

Institutions: Central South University, State Key Laboratory of Powder Metallurgy, Zhongnan Hospital of Wuhan University

Language: English

Topic: Surface Treatment and Coatings

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funders: National Natural Science Foundation of China, Key Research and Development Program of Hunan Province of China, Outstanding Youth Scientist Foundation of Hunan Province, Fundamental Research Funds for Central Universities of the Central South University

Awards: G1498101662, G4279291354, G6091820676, G6836600874