A review paper on slurry erosion of plasma and flame thermal sprayed coatings
Adarsh Kumar; Pawan Kumar Sapra; Sanjeev Bhandari
National Conference on Advancements and Futuristic Trends in Mechanical and Materials Engineering (AFTMME 2011)
abstract:The problem of silt erosion in a number of Indian hydro power stations is found to be quite serious, especially in those located in the Himalayan region. The hydro power projects constructed on rivers of Himalayas do face huge problem as these mountains are young and thus the amount of silt in these rivers is huge especially in monsoon season. Major components of turbine and pumps that gets eroded are runner, impeller, guide vanes, valves, seals etc. Coating the components with different techniques have been tried out but thermal spray coatings have shown improvement. Thermal coating techniques can be differentiated in low and high kinetic energy sprays depending upon the velocity. In this paper the two of the low kinetic energy methods used for protection against erosion has been discussed along with their resulting effects on different types of coatings. Clearly the plasma sprayed coatings perform better because of lesser defects and better microstructure as compared to flame spray coatings.
keyword:Slurry Erosion, Plasma Coatings, Flame Sprays Coatings, Hydro Turbines
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