Surface Enhancement of Turbine Blades Using Al50–Ni50/TiO2 Composite Coatings

Abstract

A base of Al_50%-Ni_50% metal was reinforced using TiO₂ with different weight percentages of 5, 10, 15, 20 and 25 wt.%. A flame thermal spray device was used to prepare samples those were sintered at 1000°C for 90 min. It was found that the best mixing ratio was 20 wt.%. After thermal sintering, the results of the SEM showed a mesh and crystalline consistency at this ratio, which shows that all properties were improved at that ratio, while the microhardness at the same ratio was 693 kg/mm². It was found that the minimum sliding wear is 1.01×10⁻⁷ g/cm, while the results of thermal tests revealed that the best mixing ratio is 25 wt.%. Following thermal sintering, it gave thermal conductivity of 125.43 W/m.K, heat capacity of 713.881 J/kg.K, thermal diffusion of 0.424 mm²/s, thermal flow of 701.711 W.S^1/2/m².K and thermal resistance of 0.0543 m².K/W.