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Low-friction behaviors of Ag-doped γ-Fe2O3@SiO2 nanocomposite coatings under a wide range of temperature conditions

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
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Abstract

In this paper, Ag-doped γ-Fe2O3@SiO2 nanocomposite coatings have been prepared by sol–gel method and deposited on steel substrate. The microstructure, surface topography, and high-temperature tribological properties of these coatings were measured and investigated by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope with energy- dispersive spectrometer (SEM/EDS), transmission electron microcopy (TEM), and a high-temperature tribometer. The results show that the γ-Fe2O3 core is coated with an amorphous SiO2 shell and Ag nanoparticles are evenly distributed in the γ-Fe2O3@SiO2 nanocomposites. The tribological properties of the coatings against ZrO2 balls have been investigated by a tribometer at room temperature (RT), 100, 300, 500, and 600 °C, respectively. It is found that the nanocomposite coatings exhibit low and stable coefficients of friction (CoF) (in the range from 0.25 to ~0.06) from RT to 600 °C, respectively. CoF of the friction pair decreases with the increase of temperature. XRD, Raman spectroscopy, and SEM measurements show that the antifriction behaviors of nanocomposite coatings are owing to the soft phases of metal Ag and γ-Fe2O3. The presence of γ-Fe2O3 with high-temperature plasticity is beneficial to form low-shear interface and to achieve low and stable friction at high temperature. The core–shell microstructure of the nanocomposite coatings inhibits the soft γ-Fe2O3 phase, changing it into the α-Fe2O3 phase.

Highlights

  • The Ag-doped γ-Fe2O3@SiO2 nanocomposites have a core–shell microstructure and Ag nanoparticles are evenly distributed in the γ-Fe2O3@SiO2 nanocomposite.

  • The adhesion strength of Ag-doped γ-Fe2O3@SiO2 nanocomposite coatings is high.

  • Ag-doped γ-Fe2O3@SiO2 nanocomposite coatings exhibit excellent tribological properties over a wide temperature range.

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Acknowledgements

We acknowledge the School of Science of Xi’an Jiaotong University for the technical support on XRD measurements.

Funding

This work is financially supported by the National Natural Science Foundation of China (51675409 and 51305331), the Fundamental Research Funds for the Central Universities (xjj2017163), and the key project of Shaanxi province Science and Technology Department (2017ZDXM-GY-115).

Author contributions

Qunfeng Zeng led the project, designed the experiments, and provided scientific and technical advice. Most of the experiments were performed by Shuangli Cai with contributions from both authors. Both authors contributed significantly to the analysis and discussion of the data and the writing of the paper.

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Authors and Affiliations

  1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an, 710049, China

    Qunfeng Zeng & Shuangli Cai

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  1. Qunfeng Zeng
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  2. Shuangli Cai
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Correspondence to Qunfeng Zeng.

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Zeng, Q., Cai, S. Low-friction behaviors of Ag-doped γ-Fe2O3@SiO2 nanocomposite coatings under a wide range of temperature conditions. J Sol-Gel Sci Technol 90, 271–280 (2019). https://doi.org/10.1007/s10971-019-04943-2

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  • DOI: https://doi.org/10.1007/s10971-019-04943-2

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