Microstructure and Ablation Behavior of Low-Pressure Plasma Sprayed ZrB Coatings Down to 100 Pa.

The effect of chamber pressure on the microstructure and ablation behavior of ZrB coatings deposited by low-pressure plasma spraying was investigated. The results showed that as the spray chamber pressure further was reduced to less than 50 kPa, the porosity of the coating deposited at the same distance decreased with the chamber pressure, and the coating prepared under 100 Pa presented the lowest porosity of about 0.89%.

Effect of Powder Particle Size and Spray Parameters on the Ni/Al Reaction During Plasma Spraying of Ni-Al Composite Powders.

It was known for long that Ni-Al composite powders can be used to deposit self-bonding coating as a bond coat for common ceramic coatings due to the exothermic reaction between Ni and Al. However, it was found that with commercial Ni-Al composite powders with a large particle size, it is difficult to ignite the self-propagating reaction between Ni and Al to form Ni-Al intermetallics by plasma spraying. In this study, Ni-Al composite powder particles of different sizes were used to prepare Ni-Al intermetallics-based coatings by plasma spraying.

Plasma-Sprayed High-Performance (BiO)(YO) Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs).

Rare earth element-doped bismuth oxides with the fluorite structure (δ-BiO) exhibit high oxygen ion conductivity at low temperature, which is promising electrolyte materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). However, traditional co-sintering process is not applicable to the manufacturing of IT-SOFCs using low melting point BiO-based electrolyte, while further high-temperature processing is not required for deposition BiO-based electrolytes. In this study, plasma spraying was used to examine the possibility to deposit high-performance BiO-based electrolytes without the following high-temperature process.