PVD coating means Physical Vapour Deposition of Titanium, Titanium Aluminium and Chromium. The process is also referred to as Titanium/Titanium Aluminium/ Chromiumplating. The technology behind PVD coating is based upon the principle of plasma acceleration. The method involves purely physical processes, such as low temperature vacuum evaporation with plasma sputter bombardment.
The picture above is the result of a 3000 times x-ray taken of a 1mm stainless steel plate after coating. The result shows that the 1mm coated stainless steel plate contains of 3% of the PVD coating and 97% of original stainless steel.
PVD Coating Process:
PVD coating is takes place in vacuum chamber by evaporation process. Titanium/ Titanium Aluminium/ Chromium is vaporised by means of multi arc or magnetron sputtering. The positively charged Titanium/Titanium Aluminium/Chromium ions are mixed with nitrogen or argon gas to form a plasma. The positively charged Titanium/Titanium Aluminium/Chromium plasma is attracted to the negatively charged workpiece, thereby forming a coating on the workpiece.
We are currently able to offer 2 kinds of PVD coating technologies:
- Multi Arc technology
- Magnetron sputtering technology
Magnetron sputtering technology is somewhat different from the multi arc technology. The difference is that magnetron sputtering technology uses magnetic fields to keep the plasma in front of the workpiece, intensifying the bombardment of ions. As a result, the magnetron sputtering coating has a molecular structure a few times smaller than that of the multi arc coating. The deposition is slower, thereby creating a surface layer with much higher density and greater compaction.
The PVD coating exhibits unprecedented toughness, lubricity, uniformity, and is chemically more stable in comparison to the traditional ion plating method.
What materials are suitable for PVD Coating?
PVD Coating can be used on various materials, such as stainless steel, aluminium, iron, porcelain and certain types of PVC.
Stainless steel is best recommended for PVD Coating. Stainless steel will fade and oxidise over time when exposed to the environment, humidity, and other factors. However, stainless steel that has been PVD coated:
- will not tarnish, oxidise or discolour in harsh sun, salt water or humid environments.
- will be impervious to extended UV light exposure, with no flaking, cracking or discolouration.
- will be available in a wide range of colours, surface patterns and finishes.
The SIRIM test results for the PVD Coated Stainless steel are outlined below:
The SIRIM test result via Energy Dispersive X-Ray Analysis (EDX) also showed that the composition of the coated material on the surface of the plate contained titanium of 97.8% and Nitrogen of 2.2% (TiNx).
Types of Finishing:
PVD Coating Colours: