dialong®-R is the ta-C DLC coating deposited at a temperature below 100 °C with a standard thickness < 0.5 µm. The dialong®-R coating has a sp3 percentage (typical of natural diamond) of about 75% and a hardness of about 44 GPa (4500 HV). With dialong®-R, the customer enters the ta-C DLC world of Argor-Aljba and will appreciate its performance in milling, boring and drilling operations.

Tools with diameters up to 200 mm and lengths up to about 500 mm can be coated with dialong®-R


VDI abbreviation ta-C
Process PVD Arc
Structure Amorphous
sp3 fraction [%] 75
Color Blue rainbow
Thickness < 0,5 µm
Max. operating temperature [°C] 500
Hardness [GPa] 38
Friction coefficient 0.1

All data given are approximate values, depending on application, environment and test conditions. Coating hardness HIT [GPa] Measured by nano indentation according to ISO 14577. The hardness can be adapted to the application. Coefficient of friction (dry) versus steel determined by dry disc ball test with a steel ball according to ASTM G99. These values may be exceeded during run-in. Maximum service temperature [°C] These are approximate values.

High hardness: protection against abrasive wear, longer tool life, lower production costs.
High thermal stability up to 500 °C: possibility of MQL and dry finishes.
Adhesive wear protection: longer tool life and better quality of the machined component.
dialong®-R has proven effective on cutting tools for milling, drilling and reaming tasks in non-ferrous materials such as:
- aluminum alloys up to 8% Si
- certain composite materials
- PMMA, epoxy resins