CVD Coating:

PVC Coating

• CVD coating process (Chemical Vapour Deposition) produces the steam phase of those compounds to be deposited through chemical reactions occurring under temperature range of 800 ÷ 1000 ºC.

• The main features of this type of coating is the superior adhesion to the base steel which provides a high resistance against wear and corrosion.

• This can extend the life of seaming rolls up to 5 times compared to a standard process. Moreover, its high anti-pickup features make it possible to radically shorten the maintenance operations of the rolls themselves.

• Through the CVD process it is possible to deposit various types of coating, such as titanium carbide “TiC”, titanium nitride “TiN” and aluminium oxide “Al2O3”

• PVD process (Physical Vapour Deposition) acts under emperature conditions between 250 ÷ 480 °C through an ionic bombardment of the compounds followed by a deposition phase.

• The deposit, being golden yellow in colour, is composed by a TiN layer with a typical thickness of 5 ÷ 6 μm and has a variable hardness of 2700 ÷3000 HV.

• Compared to the CVD, the PVD coating is more suitable to coat the finished item as its deposition conditions occur at such temperatures that any dimensional variation is reduced to the minimum.

• This is the reason why it is commonly used on seaming chucks made of steel that cannot tolerate any dimensional variations.