Using Thermal Spraying by Flame to Calculate the Physical Parameters of a Nickel Based System
Keywords:Thermal spraying, cermet materials, metallic system, chrome, composites.
The method of thermal spraying by flame was used to treat turbine blades used in electric power stations and oil pipelines that suffer from external corrosion, cracks and damage, where a nickel coating was prepared with two materials, the first is tungsten carbide WC at a constant rate (5%) and the second is chromium metal (Cr%) with different percentages (0,2,4,6,8) %. Samples of a square shape with a diameter of (1cm) were prepared from out of service turbine blades after they were cut, and then the powders were mixed as a whole well and the coating was carried out by a thermal spraying device with a flame. The samples were sintered with heat at (1000°C) for only two hours. After that, the Vickers hardness, porosity and adhesion strength test was carried out, and pictures of the samples were taken through a scanning electron microscope with increasing the reinforcement ratios. Where the highest hardness was (840 kg/mm2), and the highest adhesion strength was (46 MPa) in direct proportion to the support material, while the least porosity was (8%) in inverse proportion to the support material. It showed the amount of crystalline consistency and mechanical interlocking, which in turn gave distinctive and encouraging results, as it was found that the best strengthening percentage was (8%), as the surface consistency and the distinct crystallineness of the powders sprinkled on the base of the coating were noted.
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