Cr-Doped Al₂O₃ Deposited by Solution Precursor Plasma Spraying by Hybrid Water-Stabilized Plasma Torch

This study investigates the co-deposition of aluminum and chromium oxides from solution precursor feedstocks with the aim of maximizing the α-alumina content. A hybrid water-stabilized plasma torch was used to spray the feedstock materials and the deposition principles were studied. The chemical composition of the deposits corresponded to the formulation of the feedstocks, indicating a uniform deposition of both materials. It was found that α-phase content can be increased in the coatings by increasing the Cr-forming precursor in the solution.