... balanceCharacteristics and application: HVAF HVOF APS .Small, medium grain gize tungsten carbide .The highest working temperature 500 °C .Alternative hard chromium . ... blade, hydropower turbines, pump parts, paper roller, gate valves, ball valves, hydraulic cylinder, compressor shaft, etc. .Near proteetion in ... using HVOF sprayed ,coating to achieve the effect: Tungsten carbide powder WC-10%Co-4%Cr