What are the properties and application characteristics of chromium oxide ceramics

       Chromium oxide (Cr2O3) is a dark green powder with metallic luster. It is a hexagonal or amorphous crystal. Its melting point is 2265°C to 2435°C, and its density is 5.2g/cm3. It is a neutral oxide. thing. The chemical properties of the plasma sprayed chromium oxide coating are very stable, insoluble in acids, alkalis, salts and various solvents. Fresh and sea water and light are extremely stable, but dissolve in hot sodium bromide salt solutions. Chromium oxide coating has excellent hydrophilic properties, forming a uniform water film on the coating surface. Physical Properties of Chromium Oxide

    Chromium oxide has good spraying process performance, its spraying process specification is wide, the sensitivity to overheating during spraying is small, and the coating is not easy to crack when local overheating occurs. The sprayed layer is very dense and has high bonding strength with the substrate, making it easy to perform machining such as grinding and polishing. However, the deposition efficiency of pure chromium oxide powder is low, which increases the cost of coating. The chromium oxide coating prepared by flame spraying or plasma spraying is relatively dense, and the coating is insoluble in acid, alkali and alcohol. After proper sealing, the coating can be used in environments with chemically aggressive media.

    It can be used as wear-resistant particle wear, hard surface wear and erosion wear coatings below 540 degrees Celsius, cavitation-resistant coatings; anti-corrosion wear coatings for parts used in chemical media below 250 degrees Celsius (subject to appropriate Sealing treatment), such as pistons, plungers, chemical machinery shafts, pump seals, wear rings, slide valves, cylinder liners, exhaust fans, polishing and polishing fixtures, etc.; fiber wear-resistant coatings, such as chemical fiber spinning machines The godet wheel, friction wheel, roller roller, etc.; magnetic conductive wear-resistant coating, such as tape recorder head, etc.

    The sprayed Cr2O coating is dark green, with strong covering ability and high and stable thermal emissivity in a wide range of out-of-line wavelengths. Commonly used in infrared radiation coating (such as electric heating tube coating), high temperature magnetic conductive wear-resistant coating, etc.

    Because the coating is easy to grind, it can be ground to a small surface roughness, polished to a mirror surface, and has excellent lubricity to water. etched hydrophilic coating. Coatings can be prepared by spraying processes such as gas-stabilized plasma spraying, water-stabilized plasma spraying, supersonic plasma spraying, supersonic flame spraying, explosive spraying and powder flame spraying.