Preparation of Al2O3-TiB2 composite coating by Air Plasma spraying of SHS powders on steel substrate
MIRHOSSEINI S. 1,2, MOSALLAEE M. 2, RAZAVI M. 3, FOTOUHI M. 4
1 Modern Ceramic Materials Institute, Academic Center for Education, Culture and Research-Yazd Branch, Yazd, Iran; 2 Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran; 3 Department of Ceramics, Materials and Energy Research Centre, Karaj, Iran; 4 Department of Materials, Mechanics, Management and Design, Delft University of Technology, Delft, Netherlands
In the present study, Al2O3-TiB2 coating was successfully produced on steel substrates by atmospheric plasma spraying using the powders obtained from self-propagating high-temperature synthesis. At first, the H3BO3, TiO2, and Al mixture was milled for 10 h and then combustion synthesis was conducted in the mode of thermal explosion in a furnace in an inert atmosphere (Ar) at 900°C. After the granulation of obtained powder, they were deposited on a steel substrate. XRD and FESEM investigated the phase composition and microstructure of SHS powder and coating. Wear behavior was investigated by measurement of hardness, wear track width and wear rate for the coating and substrate. Microhardness and wear resistance of the coating were improved in comparison with the substrate. FESEM observations showed that the coating thickness was about 300 µm and abrasive, delamination and adhesive were the main wear mechanisms in Al2O3-TiB2 coated specimen.