Hot corrosion and thermal shock performance of nanoparticulate YSZ coatings deposited via suspension plasma spraying (SPS)

In this research, the preparation, and some thermal behaviors of nanoparticulate yttria stabilized zirconia (YSZ) coatings were assessed. Aqueous suspensions containing YSZ nanoparticles were produced and then used to deposit thermal barrier coatings through the suspension plasma spraying (SPS) method. Cyclic hot corrosion and thermal shock experiments were performed on the coatings in a Na2SO4-Na2VO3 molten salt at 880 degrees C and under rapid cycles at 1100 degrees C, respectively. The coating obtained from spraying of the optimal suspension, which includes YSZ nanoparticles dispersed with alpha-Terpineol as a surfactant, promisingly has a columnar-shaped structure. The lifetimes of this columnar SPS-YSZ coating during the hot corrosion and thermal shock experi-ments were measured to be 380 h and 120 cycles, respectively, whereas they were 240 h and 100 cycles for a laminar coating obtained from spraying of nonoptimized YSZ. It is concluded that by optimizing the water-based suspension of YSZ nanoparticles, novel thermal barrier coatings with an optimal microstructure can be achieved, which improves the properties of the coating and increases its lifetime.

Automated summary

This research evaluated the preparation and thermal behaviors of nanoparticulate yttria stabilized zirconia (YSZ) coatings. Aqueous suspensions containing YSZ nanoparticles were used to deposit thermal barrier coatings through the suspension plasma spraying (SPS) method. The coating obtained from the optimal suspension showed a promising columnar-shaped structure and had longer lifetimes during hot corrosion and thermal shock experiments compared to the coating obtained from nonoptimized YSZ. It is concluded that by optimizing the water-based suspension of YSZ nanoparticles, thermal barrier coatings with improved properties and increased lifetime can be achieved.