P-CVD Ultra-surface hardening
(A family of Chemical Vapor
developed by DaehanCVD Co.,Ltd.
▶ Ultra-survace hardening up to Hv2500(HRc87) and toughness with
penetrated method on the metal surface for valve components
▶ To increase the life of critical metal parts operating in abrasive, erosive and chemically aggressive environments.
▶ P-CVD makes the extending valve life to improve levels with high
hardness and toughness marvelously.
This is not for a simple coating on the material surface, but for a surface penetration with CVD method. So, the P-CVD treated material has no flaking which usually takes place in the general coated material such as stellite coating, tungsten carbide coating, chrome carbide coating and so on.
WHAT IS “P-CVD”?
P-CVD is a thermochemical surface treatment based with tungsten, titanium, vanadium etc., which metal atoms are diffused into the surface of a workpiece to form CVD layer on the metal surface in high temp.
P-CVD has been proven to more than several the wear life of metal parts that were previously tungsten carbide coating titanium carbide, carburized, nitrided, nitrocarburized and hard chrome plated in numerous applications.
▶ Excellent wear resistance from surface high hardness of Hv1600~2500(HRc76~87), toughness achieved on mild steel and stainless steel, nickel, cobalt based alloys, tungsten carbide, stellited coating etc. as base materials.
▶ For referance-the hardness of tungsten carbide in itself is only Hv940(HRc68), Chrome carbide is HRc60, and stellite#6 is HRc42.
Layer hardness is retained at high service temperatures
P-CVD surface layer has high acid corrosion resistance for hydrochloric acids, sulfuric acids, phosphoric acids, acetic acids and so on.
The range at CVD layer depths is from 30 to 150㎛ depending on base material and application with the layer depth being matched to the intended application:
2. Control valves, regulating globe valves, check valves, butterfly valves, angle valves and the others. P-CVD on SS431, SS410, SS304, SS316 steel materials lasted several times longer than general coated material components. 3. Pump components such as impellers, gear rotor, housings, sleeve that are exposed to high abrasive and corrosive materials. 4. Extrusion and injection molding augers, barrels and die components to reduce friction and increase service life. 5. Grinding rotor and stator of homogenizer, screws of extruder in chemical and paper plants.