Pure hard Diamond-like-Carbon Engineering Coatings
Diamolith™ is a pure diamond-like carbon coating deposited by Plasma enhanced Chemical Vapour Deposition (PECVD). Diamolith™ is deposited by vacuum based process where precursor gases are introduced into the process chamber and are broken down within the ionized plasma into various species of carbon, hydrogen and other dopants which are subsequently condensed as a solid entity onto the substrate surface.
The resultant coating has a number of unique properties that can be imparted on to the substrate to improve performance of the DLC coatings are a family of coatings made up primarily of carbon chains in an amorphous structure with sp2 (triagonal graphite form) and sp3 tetrahedral (diamond form) bondings.
- Diamolith™ DLC coatings are used to prevent wear due to its excellent tribological properties. It is very resistant to abrasion and adhesive wear making it suitable for the use in applications that experience extreme pressure both in rolling and sliding contact such as a hip prosthesis system.
- Diamolith™ is also suitable for the enhancement and preservation of cutting edges on medical instruments. The coating is also used in highly loaded automotive applications such as cam followers. piston pins and machine wear components across a wide cross section of industry
- Diamolith™ will reduce wear during the component break in period and will provide outstanding lubricity to minimize potential wear systems developing which, when coupled with pre-coat polishing, can result in the virtual elimination of the wear mechanism
General Overview of Diamolith Coating Properties
Diamolith™ is a hard, wear resistant, carbon based Coating. Diamolith™ provides excellent surface finish and smooth surface replication. Also provides very low coefficient of friction, which improves with use and lubrication. Diamolith™ has a dense and amorphous structure providing excellent corrosion resistance. The PECVD process allows three dimensional parts to be coated with thickness conformity around the geometry.
|Composition||Typical 30-50% sp2(Graphitic)Bond / 50-70% sp3 (Diamond) bond. Variable with process|
|Hardness||Microhardness 10-40GPa / [1800-3000Hv]. Variable with process|
|Youngs Modulus||170-200 GPa|
|Sliding Wear Rate||5.1E-7mm/Nm2 compared against 6.2E4 for uncoated17-4 PH St St
ASTM G133. 25N load Dry
|Abrasion Resistance||ASTM G65 Test Dry Sand vs Rubber Wheel
60 times more than Hardened Steel
15 times more than Super Duplex Stainless Steel
|Coefficient of Friction||0.04-0.08 . Dependant on substrate surface condition improved with polished surface. Test 25N load Non lubricated|
|Adhesion to substrate||Lc1,10N / Lc2,25N / Lc3, 60N measured in scratch test|
|Coating Thickness||1-4 microns|
|Biocompatibility||Non Toxic, Non Cyto-Toxic, Non-Gentotoxic, Non-Carcinotoxic|
|Max Operating Temperature||400-500oC|
|Electrical Resistivity||400-800Wm2/k (1010ΩCm)|
|Chemical Stability||Stable in Acids, Alkalis, Solvents and Gases|