... balanceCharacteristics and application: HVAF HVOF APS .Small, medium grain gize tungsten carbide .The highest working temperature 500 °C .Alternative hard chromium .Cobalt ... higher bond strength of smooth coating .Mainly used for turbine blade, hydropower turbines, pump parts, paper roller, gate valves, ... powder using HVOF sprayed ,coating to achieve the effect: Tungsten carbide powder WC-10%Co-4%Cr