Titanium and its alloy (Ti-6Al-4V) have good biocompatibility and can be used in hip joint, knee joint, shoulder joint, ankle joint replacement, etc. In the long-term application of traditional Ti-6Al-4V implant materials. There are some problems such as harmful ion release due to poor wear resistance, insufficient biological activity and reduced corrosion resistance.
Tantalum (Ta) Coating: Pure tantalum was first used in orthopedics in 1940, and subsequent studies have shown that the metal tantalum does not show any adverse effects as a human implant. Hypergilded tantalum, its oxides and nitride compounds can promote cell adhesion, proliferation and differentiation. Li deposited TaC coating on the surface of titanium alloy, and mixed with other atoms to prepare TaCn and TaN coating to adjust the chemical composition. These coatings promote early cell adhesion and allow cells to grow in a better form on the surface. The coating of TaCn and TaN can promote cell proliferation. TAC had little effect on osteogenesis, while TACN and TAN promoted the deposition of calcium nodules and up-regulated the secretion of alkaline phosphatase (ALP), showing good osteogenic activity. TAC, TACN and TaN coatings are expected to be applied in the field of orthopedic implants, especially in the field of surface modification of titanium alloy artificial arthroplasty. The surface of Ti-6Al-4V alloy is coated with nanocrystalline Ta2O5. The coating has a good combination with the substrate, which improves the corrosion resistance, antibacterial performance, cell compatibility and blood compatibility of the alloy.
Tantalum (Ta) Coating: CoCrMo does not possess the osseointegration and characteristics required for implant survival. In contrast, tantalum is considered an excellent biomedical coating due to its excellent bone conduction properties. Halmana prepared a Ta coating on CoCrMo alloy with a thickness of about 20-600nm. A large number of apatite crystals were deposited on the surface of tantalum coated samples after 4 weeks immersion in the simulated body fluid, indicating that the biocompatibility of tantalum coated cobalt chromium alloy has been greatly improved.
