![]() Ti 2AlC-coated composites mainly undergo hard phase peeling, three-body abrasive wear, slight oxidation wear and adhesive wear at room temperature, and the primary wear mechanisms are slight adhesive wear, abrasive wear and oxidation wear at (30 N, 500 ☌) and severe adhesive wear, abrasive wear and oxidation wear at (60 N, 500 ☌).Į. Because of tearing of the Al 2O 3 and TiO 2 oxide films on composite coating surface under high loading at (60 N, 500 ☌), the friction coefficient and the wear rate started to increase. ![]() Besides, for the coating added with Ti 2AlC, the lowest coefficient of friction (COF) (30 N, 0.267 at 500 ☌) and the strongest wear resistance (30 N, 0.92 × 10 −6 mm 3/N m at 500 ☌) were obtained relying on the synergistic effect of Al 2O 3, TiO 2 oxide film and the hard phases TiC and Ti 3Al. Besides, coatings with weight fractions of 0 and 10% Ti 2AlC have an average hardness of 482 ± 3.81 and 535.3 ± 3.41 HV 0.5, respectively, which is approximately 1.51 and 1.67 times that of the substrate hardness (320 ± 1.81 HV 0.5). Results show that the composite coatings have no cracks due to TiC coated by TC4, the hard phase TiC is uniformly distributed in all regions of the coatings, and the physical phases of the two coatings mainly consist of α-Ti matrix phase, hard phases TiC, Ti 3Al, and Fe-Ti-V solid solution. To improve the wear resistance of the low-pressure turbine cowling ring’s Ti6Al4V (TC4) alloy surface and suppressing the generation of cracks during laser cladding, TiC/Ti 3Al-reinforced Ti-based composite coatings on TC4 alloy surface were fabricated through laser cladding by TC4-coated TiC mixed powder with different Ti 2AlC contents (0, 10 wt.%).
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