International audienceSolution Precursor Plasma Spraying (SPPS) is a thermal spray process where a feedstock solution is heated and pyrolized to form fine (i.e., 1000 nm) molten particles that deposit onto a substrate to form a layer. The benefits of implementing the SPPS process include, among others: (i) the possibility to create unique microstructures at nanometer scale without the injection feeding problems usually associated to powder feeders and delivery cables and (ii) rapid exploration of novel precursor compositions. In this study, preparation and characterization of porous anode layers with homogeneous Nickel distribution and nanometer sized microstructure are considered for solid oxide fuel cell (SOFC) application. Once the solution is injected, the droplets go through several chemical and physical changes and impact the substrate in different states, from fully molten one to unpyrolized one. The effects of some spray parameters, such as the spray distance and the plasma flow mass enthalpy, on the layer architecture and composition were investigated. The results show that dense or porous layers can be manufactured depending on the operating parameters
In this study, nickel-zirconia cermet layers are produced by solution precursor plasma spraying (SPPS) and compared with suspension plasma sprayed (SPS) coatings of similar content. Although nickel is uniformly distributed in both coatings, its presence in the suspension caused problems with the SPS process. With the SSPS process, precursor solutions are fragmented into droplets in which Ni, Zr, and Y are intimately mixed, resulting in very fine microstructure without the problems encountered with the SPS process. It was also found that plasma gas enthalpy and spray distance have predominant effects on in-flight pyrolysis of the elements, and that plasma gas mixture has an impact on porosity as well as the oxidation state of the nickel.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.