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Diamond-like carbon (DLC) coatings was deposited on NiTi substrates by arc enhanced magnetic sputtering (AEMS) system. The effect of serum proteins, bovine serum albumin (BSA) and fibrinogen (Fib) on the corrosion behavior of DLC-coated NiTi alloys in phosphate buffer saline (PBS) solution at 37??C was investigated using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and...
In terms of grain refinement mechanism induced by plastic deformation, NiTi shape memory alloy (SMA) was processed by means of surface mechanical attrition treatment (SMAT) in order to achieve surface nanocrystallization for surface hardening. The cross sectional microhardness of the SMAT treated NiTi SMAs was measured, in comparison with those of the residual stress relaxation and recrystallization...
Surface nanomechanical properties of ZrN and ZrCN films deposited on NiTi shape memory alloy (SMA) by magnetron sputtering were investigated by nanoindentation study. And their surface deformation mechanism under nanoindentation load was also proposed and discussed by comparison with that of the electropolished NiTi SMA.
This paper describes the use of nickle-titanium shape memory alloys as surgical implants to the patients undergoing scoliosis correction surgery. Toxic nickel particulate debris released from these materials, however, remains a major concern particularly pertaining to orthopaedic implants for which fretting is always expected at the implant junction. Therefore, the untreated ends were exposed and...
Summary form only given. In plasma immersion ion implantation, the sample is immersed in a plasma and negative high voltage pulses are applied to the sample. When the sample is negatively biased, an ion sheath is established and ions are implanted into the sample. In conventional PHI, in order to avoid sample overheating, the experiments are typically conducted using a low pulsing frequency such as...
Near-equiatomic NiTi S-shape rods of 400 mm long, which are used for surgical correction of scoliosis, are treated by nitrogen plasma immersion ion implantation (PIII) to reduce leaching of harmful Ni ions into the human body. To accomplish this purpose, a TiN barrier is created by PIII on the S-shape bars using different experimental setups. Our results reveal that the special quasi-direct-current...
Summary form only given. Plasma immersion ion implantation (PHI) is an effective approach to enhance the surface properties of various types of biomaterials. In order to enhance the surface bioactivity and corrosion resistance of NiTi shape memory alloy, calcium ions were implanted into NiTi alloys that have been pre-plasma-implanted with oxygen and nitrogen. The results are compared to samples without...
Summary form only given. Porous nickel titanium is a promising material for medical application not only because of its super elasticity and shape memory effect but also the porous structure which may enhance bone growth due to the increased surface area. It is thus especially suitable for bone tissue in-growth and fixation of biomedical implants. However, like its dense counterpart, Ni leaching from...
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