Biocompatible materials for implants and strategies for their surface modification: A review

January 17, 2018 | Penulis: mpnikolova | Kategori:
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Although the biocompatibility of Ti has been confirmed, it is still difficult to meet all the requirements, such as antibacterial ability, osseointegration and mechanical properties. Titanium alloys have a high friction coefficient while interacting with bone or tissue which can cause wear debris, pain and loosening of implants. This situation could be avoided using alloy surface modification by a durable, mechanically stable, wear resistant TiN coating with a low friction coefficient as a base for an overlaying adjacent nanostructured ТiOх. The complex coating will ensure the lowering of friction and elasticity modulus оf the surface, while fatigue strength, mechanical, wear, cracking and corrosion resistance, biocompatibility and hydrophilicity will be enhanced.
The influence of applied coating on the mechanical properties, adhesion strength and surface morphology of TiN and vacuum oxidized in the chamber coatings was studied.
Surface morphology was analyzed by light microscopy after the film deposition. Surface roughness of the samples was evaluated and XRD analyzer was used to obtain diffraction patterns. The mechanical properties, i.e. hardness, modulus of elasticity and coating strength were characterized by nano-indentation technique. HV adhesion test was utilized to compare adhesion and brittleness of the coatings. Adhesion strength was evaluated by generally accepted scratch test technique. In addition, surface hydrophilicity was utilized to compare different surface contact angles.
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