Alternant phase distribution and wear mechanical properties of an Al2O3-40Â wt%TiO2 composite coating

Al2O3-40 wt%TiO2 (AT40) coating is a low-cost and widely applied ceramic coating. In this article, the phase distribution, micro-hardness and wear mechanism, as well as the spraying conditions optimization, are discussed. Interface defects. Phase distribution and phase composition were analysed using SEM and XRD. The results show that the pre-existing surface morphology mainly determines the phase distribution. Al2TiO5 and γ-Al2O3 are the main phases in the coating. In this experiment, the highest micro-hardness (1126.2 HV0.2) was measured using a Vickers tester. Additionally, the wear rate of the highest micro-hardness coating is 0.0387 mg/N m, which is the lowest weight loss rate measured among all the samples. The wear mechanism for this sample is primarily scratches. In conclusion, the compact lamellar phase distribution decreases the number of interface defects, increases the hardness and determines the wear mechanism. Also, the phase distribution is affected by the spraying conditions.