Abstract
AbstractErosive wear of hydro-turbine runner’s blade is a complex aspect, which depends upon different factors like silt size, hardness, velocity of water and substrate material properties. The turbine runner’s efficiency has been deteriorated with the increase in the erosive wear, and final failure of hydro-turbine runners occurs. In many of the literatures, researchers have conducted different experiments to investigate the effect of these factors on erosive wear, but the size of samples has been considered in various types of test apparatus to affect the flow conditions in the turbine, but actual flow conditions and the fact of erosive wear are too complex to replicate. The literature presents the concern associated with materials and fabrication process of deployed coatings by HVOF approach used for the stability of hydro-turbine runner. The primitive mechanisms of annihilation techniques resulting in the hydro-turbine runner’s blade were given in article. The primitive approaches of thermal spraying were described, which grant the deployment of coatings with the chemical composition, phase structure and properties convenient for the improvement of functional performance. There are some recently used and possible target materials, and coating materials were presented in this article. The advantages and disadvantages of the approach of HVOF were discussed. The primitive groups of coatings with a considerable resistance to corrosion and slurry erosion wear produced by thermal spraying (HVOF) method, which can be used in the hydro-electric power plant industry, were described, and also studies undertaken in this field by several investigators have been discussed broadly.KeywordsHVOF (high-velocity oxy fuel)Silt erosionErosion wear
Published Version
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