| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1570831 | Materials Characterization | 2015 | 8 Pages |
•An Al2O3/Al composite coating was prepared on γ-TiAl alloy by magnetron sputtering.•Al2O3/Al coating exhibits high hardness and excellent elastic modulus.•Al2O3/Al coating shows lower friction coefficients and wear rates compared to substrate.•Al2O3 particles may function as the lubrication to reduce friction.•Al2O3/Al coating improved the wear resistance of γ-TiAl at elevated temperatures.
An Al2O3/Al composite coating was fabricated on the γ-TiAl alloy substrate to improve its friction wear performance at elevated temperature. A series of ball-on-disk type tests, sliding against a Si3N4 counterpart, were carried out at three temperatures: 20, 300 and 500 °C. The wear rates and friction coefficients of Al2O3/Al composite coatings at elevated temperature were much less than those of substrates. The anti-wear behavior of Al2O3/Al composite coating is attributable synergistically to its high hardness, excellent elastic modulus and self-lubrication by Al2O3 particles. This coating may be potential surface enhancement for Ti–Al intermetallics at elevated temperature.
Graphical abstractSchematic diagram of the coating evolution during friction wear test.Figure optionsDownload full-size imageDownload as PowerPoint slide
