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News

New DLC biocompatible coating is ideal for medical devices

Tecvac : 01 April, 2008  (New Product)
Tecvac of Swavesey, Cambridge, a member of the Wallwork Group, is working with Sub-One Technology to offer a range of Diamond Like Carbon (DLC) biocompatible coatings that can be applied to the internal surfaces of medical devices.
The application of very smooth, highly corrosion-resistant DLC coatings, with hardnesses of 3000 HV, gives piping, tubes and pumps major gains in energy efficiency and device life times.

InnerArmor’s enhanced plasma coating process will coat the internal surfaces of tubes and bores up to 3m in length with DLC coatings up to 50microns.
Tecvac has already identified medical coating applications in fluid transport, control and Drug delivery systems, and expects to find many other internal medical device applications where biocompatible DLC coating has previously proved difficult or impossible to apply.

The InnerArmor process creates DLC surfaces with a ‘glass-like’ amorphous (non-crystalline) structure, free from pinhole defects, even in tube lengths of 3m at aspect ratios of 1:45. This provides internal bores and tubes with high levels of protection from erosion, scaling and fouling, and prevents adhesion from gases, liquids, powders and slurries.

InnerArmor DLC coatings can be conducting or insulating, and can withstand high loads at operating temperatures of 450 degrees C. Coating application temperatures for a variety of formulations are below 200 degrees C. This enables many hollow parts to be coated with DLC, and allows the replacement of expensive high performance alloys with lower specification materials.

Tests with the new InnerArmor DLC process demonstrated good corrosion resistance and wear performance, and consistent film hardnesses of 3000 HV.

High performance was shown in salt spray tests to meet US standards. Very high wear resistance in these tests was indicated by a very low attrition rate of less than 0.0005 microns per hour. Tecvac can coat internal bores to thicknesses of between 5 and 50microns.

The InnerArmor process provides superior film bonding compared with other deposition methods. It offers all interior bore coating applications a high performance environmentally friendly process that offers the highest levels of corrosion protection, wear resistance, and energy efficiency.
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