Abstract
Atmospheric pressure non-equilibrium plasma spray technology has been developed, tested and successfully employed for deposition of catalytic and tribological coatings. Aluminum hydroxide based coatings doped with carbon particles up to 50μm of thickness were deposited on the stainless steel substrates.Results of experimental investigation on structural characteristics of plasma sprayed coatings in dependence of prevailing external factors are presented. The effect of plasma source operating regime and injection location of precursor dispersed particles (DP) on the morphology and properties of metal oxide coatings was investigated. It has been determined the relation between microstructure of coatings and arc current in plasma source.Significant differences in size and shape of coating grains were observed during deposition process when metal oxide dispersed particles were placed into the reactor channel and directly into the plasma torch discharge chamber together with the reacting gas. The plasma spray pyrolysis process has occurred in some particular regimes which have been successfully applied in the synthesis of micron- and submicron-sized uniform shaped coatings with narrow size pores and controlled surface morphologies.
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