INVESTIGATION OF WEAR BEHAVIOR OF COMPOSITE CYSZ COATING UNDER DIFFERENT LOADS

In this study, CeO2-Y2O3 stabilized ZrO2 (CYSZ) ceramic coatings, with Al2O3 and TiO2 added, were deposited on bond layer coated AISI304 stainless steel substrates by plasma spraying method. The effect of Al2O3 and TiO2 additions on the wear behavior of CYSZ coating was investigated. An investigation was conducted to examine the impact of incorporating aluminum oxides (Al2O3) and titanium dioxide into YSZ coating on its wear characteristics. Prior to conducting the wear test, the coatings underwent sanding and polishing procedures to verify that the average surface roughness was below 0.2 µm. A pin-on-disk device was subjected to wear testing in accordance with ASTM G99-04, with a rotational speed of 30 mms-1. The testing was conducted under dry conditions, with a minimum of 8000 cycles. The wear test utilised varied loads of 4N and 8N, with 6 mm diameter Al2O3 balls. After conducting the coating and wear tests, the surface properties and wear characteristics of the coatings were examined using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The wear rate of the samples was assessed using mechanical profilometry. The microhardness of the materials was assessed using Micro Vickers testing equipment. The compounds added into CYSZ caused an increase in the hardness value. The results demonstrated that the addition of Al2O3 to cerium-yttria stabilized zirconia (CYSZ) resulted in enhanced wear resistance, while the addition of TiO2 significantly reduced wear resistance.