Abstract: A method and system for production of powders, such as micropowders and nanopowders, utilizing an axial injection plasma torch. Liquid precursor is atomized and injected into the convergence area of the plasma torch. The hot stream of particles is subsequently quenched and the resultant powders collected.

Abstract: A method for making a densified ceramic layer comprises plasma spraying a layer of the ceramic onto a substrate; spin-coating the plasma-sprayed layer with a sol, and firing the spin-coated ceramic layer. The method may be applied in producing layers of yttria stabilized zirconia (YSZ) having application as electrolyte layers for solid oxide fuel cells or thermal barrier coatings, for example. The firing may be performed at a relatively low temperature such as 650° C. or even below. A method for enhancing electrochemical properties of an interface involving a layer of YSZ or other ceramic comprises spin-coating or otherwise impregnating the layer with a sol and heating the spin-coated layer.