The apparatus for the thermal spray delivery of a precursor solution
comprises a first solution reservoir, a second solution reservoir,
singular or multiple atomizing liquid injector(s) disposed in fluid
communication with the reservoirs, a flame source configured to direct a
spray from the atomizing liquid injector to a substrate, and a thermal
control device disposed in thermal communication with the substrate. The
method of depositing a precursor solution at a substrate to form a
coating comprises maintaining a substrate at a pre-selected temperature,
delivering the precursor solution from a reservoir bank, atomizing the
precursor solution, injecting the atomized precursor solution into a
flame, and directing the flame to the substrate.