Vapor deposition

Vapor deposition technique to obtain a thin film (thickness 0.1 ~ 5μm) technology. That is to be produced in a vacuum vapor deposition of materials, the steam condensing on the substrate to form the desired film. The techniques include physical vapor deposition (PVD), chemical vapor deposition (CVD), and physical and chemical vapor deposition (PCVD). It is in steel, nickel, cobalt-based alloy carbides and carbide coating surface to establish a modern method, coating a carbide, nitride, boride, and complex compounds.

1 Physical Vapor Deposition

Physical vapor deposition techniques, due to the low processing temperature, heat distortion, pollution-free, easy access to super-hard layer, coating uniformity, etc., used in precision mold surface hardening treatment, showing a good effect. The use of PVD TiN layers obtained by processing the plastic mold life assurance increased by 3 to 9 times, the metal pressure processing tool life increased by 3 to 59 times. Screw head punch using TiN layer lifetime is not long, prone to peeling.

(2) Chemical vapor deposition

Chemical vapor deposition, sediment deposition zone by the introduction of high temperature gas generated from the solution. CVD process of the mold shape without any restrictions, CVD can be greater than 0.8% carbon tool steel, hardened steel, high-speed steel, bearing steel, cast iron and the other on the surface of carbide. Vapor deposition of TiC, TiN can be used in extrusion die, blanking die and bending die, but also for powder molding and plastic mold and so on. Coating on the metal mold in TiC, TiN coating process, the coating hardness up to3000HV, and good wear resistance, anti-friction performance, die life can be increased 1-4times.

3 physical and chemical vapor deposition

as the high temperature CVD process, hydrogen chloride atmosphere containing more than, if handled improperly, easy to pollute the atmosphere. To overcome these shortcomings, using argon as the carrier, the development of medium temperature CVD method, treatment temperature 750 ~ 850 ℃ can be. This method is in wear resistance, corrosion resistance as much as high-temperature CVD method. PCVD both CVD and PVD technology features, but requires accurate monitoring of process parameters to ensure stability.

 



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