Mikrostruktur und Eigenschaften HVOF-gespritzter Schichten im System TiO2 - Cr2O3

Thermally sprayed titanium oxide coatings are known for their good tribological properties and their electrical conductivity. The latter is due to oxygen deficiency from the stoichiometric composition TiO2. These lattice defects can be ordered and are called crystallograhic shear planes. These structures are known as Magnéli phases. At high temperature in oxygen-containing atmospheres the material forms isolating TiO2, therefore the application under such conditions is restricted. At the titania-rich side of the system TiO2-Cr2O3 also compounds with the structure of Magnéli-phases are formed. According to information from the literature, these phases are stable in oxygen-containing atmospheres and are therefore promising for corresponding coating applications at elevated temperatures. In this paper first results of systematic studies of microstructure and properties of HVOF-sprayed coatings are presented. © <a href="http://www.fiz-technik.de/db/b_tema.htm" target="_blank">TEMA