Tekniker

Advanced coatings for hip implants

Objective

To evaluate the corrosion-wear behaviour of high performance TaN (tantalum nitride) coatings applied to medical grade titanium alloy for improving the response of (hip) implants to wear and corrosion in biological fluids.

Results

Development of a biocompatible coating that protects against corrosion, wear and and tribocorrosion and which improves the durability of the implant.

Advanced coatings for hip implants

The main cause of failure of medical implant hips or knees is usually due to tribological causes. The prosthesis´ components slide against each other in a corrosive medium of biological fluid. The biomedical alloys used in these types of implant (Ti, CoCrMo, AISI316) are passive, corrosion resistant materials, but the sliding action in a counter-material means that the protective passive layer is destroyed making these materials susceptible to corrosion under slippery conditions.

In this case, a biocompatible coating that protects against corrosion, wear and and tribocorrosion and which improves the durability of the implant was developed.

For this, tantalum nitride (TaN) coatings were developed using PVD (Physical Vapour Deposition) technology and HIPIMS (High Power Impulse Magnetron Sputtering) on medical grade titanium alloy.

The TaN coatings significantly reduce the friction in the tribological system and reduce wear due to tribocorrosion by 98% compared to the titanium substrate. 

This solution is applicable to sectors such as biotechnology, biomedicine and health.

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