|
Fig.3: plant for PVD Surface Coating
High max 2 meter.
|
How a coating is performed
When a coating is chosen, the choice does not only imply the type of coating but also its deposition technique. In fact it is possible to perform coatings with TiN in different ways, and any of them has advantages and disadvantages in terms of results, hole penetration, optimal thickness, characteristics required to the substratum and even in its fundamental property, the hardness, which does not only depend on the nature of the deposited substance, independently from the process, but also from the inner tensioning.
The most widespread techniques in the industry sector are three:
• P.V.D. (Physical Vapour Deposition): the most widespread, because its performance depends less on the material to be treated and it is faster to perform. It is divided in different technologies such as "arch " and "sputtering".
• C.V.D. (Chemical Vapour Deposition): less widespread and used, it has he best characteristics as far as the quality of the covering is concerned.
• P.A.C.V.D. (Plasma Assisted CVD): the leatest technique: it has characteristics half a way between PVD and CVD. The useful dimensions are higher and it is possible to perform ion nitriding and coating together. This technique, like CVD, is now limited to TiN (titanium nitride) and to TiCN (Titanium Carbonitride).
This is not enough to explain which technique is the best in any particular case, but it shows that it is not sufficient to ask for titanium nitride rather than for another covering, but the choice of the deposition technique is fundamental for the good results of the application. TTN and CRT can offer all these three techniques, further to massive thermal and termochemical superficial treatments. We are therefore able to suggest you from the material used to the final coating, because we deal daily with a broad range of different steel treatments.
|
