Research of Properties of Nanostructured Cr₂O₃5SiO₂3TiO₂ coatings by plasma sprayed

Plasma sprayed chromium oxides coatings have been widely applied in anilox rolls and pump seal for many years. This paper is researching the effect of nanostructured Cr₂O₃5SiO₂3TiO₂ composite powder preparation when adding nano-size SiO₂ and TiO₂ powder in Cr₂O₃ powder, to prepare for through spray drying, high temperature sintering and flame density. The microstructure of powder and plasma sprayed coating are analyzed by SEM and XRD, compared with pure Cr₂O₃ powder and METCO 136F powder. The Microhardness of the coatings are measured by 402MVA^TM Vickers hardness tester. Fracture test is used to analysis the ductility of coatings, and the fracture appearance is analyzed by SEM. The result indicates that the mechanical behaviors of nanostructured Cr₂O₃5SiO₂3TiO₂ coating has better performance in the nature of hardness and ductility.