Tantalum Coating for Nitinol Shape Memory Alloy Implants

Transition nickel-titanium alloy has rich phase phenomenon, unique morphological effect, excellent mechanical properties, high damping characteristics and elastic modulus similar to human bone, and is widely used in dentistry, orthopedics, interventional therapy, cardiology, otolaryngology, Gynecology and other medical fields have become the most promising materials for biomedical materials.

However, the surface of NiTi alloy implants is prone to induce thrombosis, which is one of the main challenges in its clinical application, and its corrosion resistance and wear resistance still do not meet the ideal standards. The release of nickel ions around tissues after NiTi alloy implantation may cause allergic reactions and toxic side effects.

Tantalum (Ta) coating: Some researchers have improved the corrosion resistance and barrier effect of tantalum coatings to prevent the release of Ni ions into the immersion liquid. A new type of tantalum coating was prepared on the surface of NiTi alloy, which effectively suppressed the release of Ni ions and effectively improved the radiation opacity of NiTi alloy.

Experiments show that the tantalum coating effectively inhibits the release of Ni ions, and annealing treatment can further reduce the release of Ni ions. Yin et al formed a tantalum coating on the surface of NiTi shape memory alloy (NiTiSMA), which effectively improved the corrosion resistance of NiTi shape memory alloy. The tantalum plating layer is uniform and dense, with a thickness of about 400 μm. Electrochemical experiments show that the surface modification treatment can effectively improve the corrosion resistance of NiTi shape memory alloy without galvanic corrosion, which provides a basis for the optimization of NiTi shape memory alloy implants.

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Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

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