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Thermal Stability and High-Temperature Super Low Friction of γ-Fe 2 O 3 @SiO 2 Nanocomposite Coatings on Steel.

Authors :
Zeng, Qunfeng
Source :
Lubricants (2075-4442); Jun2024, Vol. 12 Issue 6, p223, 13p
Publication Year :
2024

Abstract

The thermal stability of the γ-Fe<subscript>2</subscript>O<subscript>3</subscript>@SiO<subscript>2</subscript> nanocomposites and super low friction of the γ-Fe<subscript>2</subscript>O<subscript>3</subscript>@SiO<subscript>2</subscript> nanocomposite coatings in ambient air at high temperature are investigated in this paper. X-ray diffraction, scanning electron microcopy, transmission scanning electron microcopy, high-temperature tribometer, thermogravimetric analysis and differential scanning calorimetry were used to investigate the microstructure, surface morphology and high-temperature tribological properties of the γ-Fe<subscript>2</subscript>O<subscript>3</subscript>@SiO<subscript>2</subscript> nanocomposite coatings, respectively. The results show that the γ-Fe<subscript>2</subscript>O<subscript>3</subscript>@SiO<subscript>2</subscript> nanocomposite with the core–shell structure has excellent thermal stability because the SiO<subscript>2</subscript> shell inhibits the phase transition of the γ-Fe<subscript>2</subscript>O<subscript>3</subscript> phase to the α-Fe<subscript>2</subscript>O<subscript>3</subscript> phase in the nanocomposites. The temperature of the phase transition in γ-Fe<subscript>2</subscript>O<subscript>3</subscript> can be increased from 460 to 829 °C. The γ-Fe<subscript>2</subscript>O<subscript>3</subscript>@SiO<subscript>2</subscript> nanocomposite coatings exhibit super low friction (0.05) at 500 °C. A high-temperature super low friction mechanism is attributed to γ-Fe<subscript>2</subscript>O<subscript>3</subscript> and the tribochemical reactions during sliding. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20754442
Volume :
12
Issue :
6
Database :
Complementary Index
Journal :
Lubricants (2075-4442)
Publication Type :
Academic Journal
Accession number :
178195071
Full Text :
https://doi.org/10.3390/lubricants12060223