Materials for Ceramic Coating/dipped-pitch Graphite tribo-Pairs for High Speed Cigarette Quality Checked Equipment

The thermally sprayed ceramic coatings have wide applications in machinery industries due to their high resistance to wear, corrosion and high temperature oxidation. Based on the work condition of the ceramic coatings in the high speed cigarette quality checked equipments, the wear behaviors of Al2O3-40%TiO2, Al2O3-20%TiO2, WC-12%Co and Cr2O3 coatings sliding against a dipped-pitch graphite were comparatively investigated for selection of wear resistant and cost effective caramic coating. The experimental results indicated that the rank of wear rates from high to low was Al2O3-40%TiO2 , Al2O3-20%TiO2, WC-12% Co, Cr2O3. Therefore, the Cr2O3 coating possessed the highest wear resistance and its main wear mechanisms were adhesive wear, fracture and abrasive wear.