Effect of Second Phase Particles on Solid Particles Erosion of Air Plasma Sprayed Yttria Stabilized Zirconia

Abstract:

Yttria stabilized zirconia (YSZ) based composite topcoats were prepared with three advanced ceramic materials as second phase component; CaZrO₃, (La_0.75Nd_0.25)₂Zr₂O₇ and Nd₂Ce₂O₇. The solid particles erosion (SPE) testing of the air plasma sprayed composite topcoats was carried out at room temperature and 900 °C to study the effects of second phase on erosion behavior. The erodent was angular fused alumina of 40-45 mm size. The erosion mechanism was followed in all topcoats with cracking and fracturing of the plasma sprayed splats due to erodent particles impact and impingement, whereas micro-ploughing was observed after 900 °C SPE testing as an additional feature. The hardness and intrinsic properties of second phase component in the composite topcoats played a crucial role in improving the erosion rate (ER) at ambient as well as 900 °C. The Nd₂Ce₂O₇/YSZ topcoat show lower ER due to combatively higher hardness of Nd₂Ce₂O₇ and good interfacial bonding with YSZ. The overall lowering of ER at 900 °C as compared to that of at ambient conditions was ascribed to the anelastic mechanical response of the ceramic topcoats due to thermal cycling involved in the SPE testing at high temperature.

• Periodical: Key Engineering Materials (Volume 875)
• Pages: 302-314
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.875.302
• Online since: February 2021
• Authors: Noveed Ejaz*, Liaqat Ali, Muhammad Mansoor
• Keywords: Calcium Zirconate, Lanthanum Zirconate, Neodymium Cerate, Pyrochlore, Solid Particles Erosion, Thermal Barrier Coating, YSZ

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