The coating includes plasma spraying ceramic wear-resistant coating and supersonic flame spraying carbide cermet coating.
The ceramic materials which plasma spraying use are mainly aluminium oxide, titanium oxide and chromic oxide. These kinds of materials have the excellent performance of high hardness, good corrosion resistance, good heat resistance and low friction coefficient etc. So the coating has excellent and stable wear resistance and antifriction performance. The coating’s structure is dense and its surface can be polished to mirror surface(Ra0.03-0.10 μm). For example, the high pressure pump piston’s surface are sprayed 0.3-0.5mm ceramic coating, its service life will be 6 times longer than hard chrome plated piston’s. This coating is the most widely used ceramic coating.
Supersonic flame spraying cermet coating which composites nickel-chrome, cobalt base metal phase and tungsten carbide, chromium carbide etc. hard phase ceramic materials, has the characteristics of high hardness, good toughness and shock resistance etc. Its bonding strength can reach 50-80MPa.
Plunger pump piston, high pressure washer piston, agricultural sprayer piston; much kind of water seal and oil seal shaft sleeves.
1. AT13 (Al2O3/TiO2 87%/13%): High hardness, good wear resistance.
2. Cr2O3: High hardness, low friction coefficient, good corrosion resistance, abrasive wear resistance.
3. Co-WC: Good high temperature red hardness, abrasive wear resistance, erosion resistance.
4. Ni-WC: High hardness, high temperature oxidation resistance.