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Vol.23, No.3, 2023, pp. 257–260 |
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NEW TYPES OF PROTECTIVE COATINGS AND DEVELOPMENT OF TEST METHODS Marko Pavlović1*, Marina Dojčinović2, Muhamed Harbinja3, Atif Hođić3, Mirjana Stojanović4, Zoran Čeganjac5, Zagorka Aćimović4 1) University of Belgrade, Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, SERBIA *email: pavlovic.marko38@gmail.com 2) University of Belgrade, Faculty of of Technology and Metallurgy, SERBIA 3) Innovation Scientific Development Centre (INRC), AD Harbi Ltd., Sarajevo, BOSNIA and HERZEGOVINA 4) Engineering Academy of Serbia 5) Academy of Vocational Studies Šumadija, Aranđelovac Department, SERBIA
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Abstract The paper presents the results of synthesis and characterisation 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 processes. According to standard ASTM G32 an ultrasonic vibrational method with stationary sample was used for characterising 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 resistance is given for tested coatings. Coating quality is evaluated based on cavitation loss rate and on the analysis of sample surface damage formation and development under effects of cavitation. Keywords: mullite, cordierite, zirconium silicate, pyrophyllite, protective coating, cavitation resistance |
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full article (397 kB)
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