Evolution of Hot Corrosion Behavior of YSZ‐Ta₂O₅ Composites with Different YSZ/Ta₂O₅ Ratios

Abstract

This study compares the hot corrosion performance of yttria-stabilized zirconia (YSZ)-Ta 2 O 5 composite mixtures (TaYSZ) in the presence of molten mixture of Na 2 SO 4 + V 2 O 5 at 1100°C. The tested compositions vary from pure YSZ (0TaYSZ) to a Ta 2 O 5 -dominating (70 wt% Ta 2 O 5 + balance YSZ, 70TaYSZ) composite mixture with a gradual increase of Ta 2 O 5 . 50TaYSZ (50 wt% Ta 2 O 5 + balance YSZ) sample forms a highly stable zirconium tantalum oxide. 50TaYSZ is more stable, both thermally and chemically in Na 2 SO 4 +V 2 O 5 media at 1100°C, than other tested YSZ-Ta 2 O 5 (TaYSZ) composites, and shows a good hot corrosion resistance.

WITHDRAWN: Hot Corrosion Evaluation of Cr 3 C 2 /8YSZ based Plasma Sprayed Coatings on SS316 in Na 2 SO 4 – V 2 O 5 Molten Salt Environment at 700 0 C

“…More acidic stabilizers can delay or prevent the change of Zirconia to completely monoclinic, which is the cause of YSZ's failure. Coatings made of YSZ were shown to be the most effective coatings in thermal barrier characteristics of gas turbine blades, and their hot corrosion behaviour on superalloys in hot gas environments has been reported in the previous work [21][22][23][24][25][26]. The study conducted by Avci et al [27] examined the effectiveness of YSZ coating in preventing corrosion at high temperatures.…”

Thermal Stability and Hot Corrosion Performance of the AlCoCrFeNi2.1 High-Entropy Alloy Coating by Laser Cladding

“…Due to the presence of impurities such as Na and S in fuel, the combustion process can often lead to the deposition of a Na 2 SO 4 salt film on the surfaces of steam pipelines and the hot-end components of gas turbines, definitely reducing the high-temperature strength and lifespan of the materials [1][2][3]. Furthermore, as human activities are increasingly expanding to coastal areas, the hot-end components in these regions face a more serious corrosive environment.…”

Investigation of Hot Corrosion Behaviour of Uncoated and WC-17CO Coated Samples in Aggressive Molten Salt Environment

“…The problem is known as hot corrosion that is caused due to the combination of hot temperature along with contaminants from surroundings and burning of low grade fuels. Various products like sodium, sulphur, vanadium and chlorine accelerate the rate of degradation of the turbine and boiler tubes [1,2].…”