Medthin™ 60 ZrN
The high oxidation resistance coating
Medthin™ 60 coating is particularly suitable for improving articulating joints such as those of “Coating on UHMWPE” where polyethylene wear and ion release from substrates (CoCr, SS, TAV, etc) is strongly reduced. The coating is applied with thickness of about 5 µm and it has adhesion strength to metal substrates in the GigaPascal range. The ZrN layer improves UHMWPE abrasion resistance >65% measured on knee simulator tests compliant with ISO 14243. Zirconium Nitride (ZrN) is deposited with latest generation technologies showing a polycrystalline cubic structure with a fine and very dense structure, roughness (Ra) values below 0.05µm, ideal for articulating zones. The coating coverage is rather uniform on external surfaces while internal surfaces are difficult to coat.
Ionbond can currently deliver coating service of “Medthin™ 60 ZrN on Implants” from multiple coating centers.
Technical data |
|
|---|---|
Material |
Zirconium Nitride |
Applicable on following implant material |
Titanium, TAV, CoCrMo, 316 LVM, all SS |
Technologies |
PVD arc or sputtering |
Color |
Light gold |
Thickness, μm |
5¹ |
Hardness, GPa |
25 to 32 |
Phase composition |
Cubic, Polycrystalline |
Surface texture, Ra |
<0.05 |
Coating coverage |
Mainly external surfaces² |
Masking partial zones or over porous coat |
Possible |
Dissolvability |
Not reported in serum |
Adhesion strenght, MPa |
>1000 |
Wear (abrasion) resistance, coating against UHMWPE |
>65%³ |
Porosity density, n/mm² & pore size, μm |
PVD Arc (<400, 1) and PVD sputter (<50, 0.5) |
Reduction of allergic potential (CoCrMo, FeCrNi) |
>98%⁴ |
Surface wettability of ZrN |
Similar to mirror polished CoCrMo |
Thermal oxidation resistance (in air) |
500°C |
Chemical oxidation resistance |
Resistant to PH>7 froming oxide passivation layer (not oxidizing) |
Resistance to sterilization |
All common methods allowed |
Implant applications |
Orthopaedic, spine & trauma |