New types of protective coatings and development of test methods

Abstract

The paper presents the results of synthesis and charac-terisation of refractory coatings based on various fillers intended for the protection of metallic structures. Refractory fillers applied are based on mullite, cordierite, zirconium silicate, and pyrophyllite. Refractory filler samples are treated by micronization grinding down to 15 m filler particles. Methods as XRD, SEM, and optical microscopy are used for characterisation. Performed tests determined the optimal composition of protective coatings and manufacturing pro-cesses. According to standard ASTM G32 an ultrasonic vibra-tional method with stationary sample was used for charac-terising the obtained coatings. The goal of the research was to determine the coating quality and its applications in metallic surface protection in conditions of wear, corrosion, cavitation, and high temperature. All coatings were tested under the same conditions. A comparison of cavitation resis-tance is given for tested coatings. Coating quality is evalu-ated based on cavitation loss rate and on the analysis of sample surface damage formation and development under effects of cavitation.