The Effect of Adding Nickel Content to Turbine Blades Coating Using Thermal Flame Spraying

(Ashwaq T. Dahham, Sufian H. Humeedi, Salih Y. Darweesh, Ziad T. Khodair)

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Abstract

The current study dealt with manufacturing cermet composites from ceramic material (MgO) reinforced by a bonding nickel metal with different contents             (0, 10, 15, 20, 25%) using thermal spraying by flame on steel surfaces (316L) with a constant spraying distance (15cm). The bases were cut into small circular shapes and roughened so that the coating layer was merged with them. The prepared samples were sintered at 800°C, 1000°C and 1200°C for two hours. Hardness, porosity, adhesion strength with different nickel contents, scanning by electron microscope (SEM) and X-ray diffraction (XRD) were tested. The test results revealed that nickel content of 20%, spraying angle of 90°, spraying distance 15cm and sintering at 1200°C gave good physical and mechanical properties. The SEM results also gave clear value in terms of surface topography and the grain's homogeneity with the best improvement at 1200°C. The best results for hardness and adhesion strength occurred at the nickel content of 20% accompanied by the lowest value of porosity at the same content. However, the results of XRD only showed that the material used was MgO with reinforcement material (Ni), which appeared in the Cubic phase.  

KEYWORDS
Adhesion strength, cermet composites, hardness, porosity, thermal treatment

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