Basic Principles to Obtain Oxide Ceramic Coating Systems with Reduced Sliding Wear by Suspension Plasma Spraying

In this study, suspension plasma spraying is used to produce self-lubricating titanium oxide coatings. Certain nonstoichiometric titanium oxide phases, called Magneli phases, exhibit a reduction in friction under dry sliding conditions at elevated temperatures. These phases, however, tend to undergo crystal changes during thermal spraying, resulting in the loss of their good friction behavior. In this work, the goal is to stabilize these phases with suitable lattice substitutions for Ti⁴⁺. The resulting phases are shown to be homologous to Ti_nO_2n-1, but have the advantages of a three-component system, making them more thermally stable with a broader area of formation.