Abstract
Abstract Abrasive resistances of engineering components encountering the attack of erosive environments during operation can be improved by ceramic coatings on their surfaces with a optimum techniques of plasma spraying. The present paper mainly studied abrasive properties of a series of ceramic coatings with different low pressure plasma spray (LPPS) and combined LPPS/APPS (atmospheric pressure plasma spray) methods, in comparison with that of SUS 329J1 dual phase stainless steel, in the jet-in-slit and the rotating specimen testers. The erosive environments were selected as silica sand slurry and fly ash(x%)+gypsum(y%) slurries, respectively. The test results from the two testers did not always coincide although they did in general. The paper summarizes the possible reasons and the implications of the distinctions. In addition, the impact frequency, velocity and angle of particles on the surfaces of the specimens were measured and calculated, and they were used to explain the wear properties of ceramic coatings. Generally, ceramic coatings, such as Cr2O3 and Al2O3, have much improved wear resistance. But the advantages of their wear properties are decreased with increasing impingement angle. In the fly ash(x%)+gypsum(y%) slurry environments which are usually existed in the desulphurizers of thermal power plants, the most deleterious environment for the pumps is pure fly ash (fly ash(100%)+gypsum(0%) slurry.
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