dianoir® is a coating ta-C DLC specially developed to meet the highest technical and aesthetic requirements of the watch and jewelry industry. The black-anthracite color represents optimal prerequisites for aesthetical applications and the hardness of 4500 HV ensures a high wear resistance even in difficult environmental conditions.


VDI abbreviation ta-C
Process PVD Arc
Structure Amorphous
sp3 fraction [%] 70
Color black-grey
Thickness 1 µm
Max. operating temperature [°C] 500
Hardness [GPa] 44
Friction coefficient 0.1

All provided data are approximate values, depend on the application, environment and test conditions. Coating hardness HIT [GPa] measured by nano indentation according to ISO 14577. Hardness can be adapted to the application. Friction coefficient (dry) compared to the steel determined by ball-on-disc dry test with a steel sphere according to ASTM G99. During the running-in the indicated values may be exceeded. Maximum service temperature [° C] These are approximate values.

dianoir® is produced with a deposition system for ta-C DLC coatings patented by Argor-Aljba. The main advantages are:
high wear and corrosion resistance
- uniform black-anthracite color
- non-toxic process and biocompatibility are optimal properties for the use of dianoir® in contact with the human skin
- special intermediate layer to ensure perfect adherence


dianoir® has brilliantly passed all the technical tests used for the certification of coatings in the watch industry. dianoir® has shown brilliant results in resistance tests in saline environments, abrasion resistance tests and artificial transpiration tests.