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