Abstract
The present study aims to investigate the performance of Yttria Stabilized Zirconia and Alumina Thermal Barrier Coatings deposited on EN steel substrates used in gun barrel through Atmospheric Plasma Spray Process. Chemical compositions of the EN steels (EN8, EN19, EN24 and EN36C) as well as the particles were examined prior to the coating process. Atmospheric Plasma Spray Process was carried out using carrier gas with two different flow rates of 3 and 4scfh. A bond coat was made for 50 µm by depositing NiCrAlY and the top coats were made for 200 µm distinctly using Yttria Stabilized Zirconia and Alumina. X-ray Diffraction and Field Emission Scanning Electron Microscope examination were performed on the coated specimens to observe the phase and morphology respectively. Thermal testing and Infrared thermal imaging were performed to measure the insulation performance and spallation performance under different exposure time (upto 20 minutes) for the input temperature of 200˚C. Wear and scratch test were conducted on the specimens to determine the coating integrity as well as bonding of top and bond coat to substrate. YSZ coated EN36C steel produced under carrier gas flow rate of 3scfh possessed greater insulation performance compared to all other steels. Also, YSZ coated EN36C steel has better wear and scratch resistance indicating lesser deformation compared to other materials.
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