Structure and morphology of whitlockite coating electrophoretically deposited on NiTi shape memory alloy
Journal Title: Engineering of Biomaterials / Inżynieria Biomateriałów - Year 2017, Vol 20, Issue 140
Abstract
In order to improve the biocompatibility of NiTi shape memory alloy, the surface was modified by formation of multifunctional layer consisted of titanium oxides and whitlockite ceramic. Amorphous TiO2 interlayer was produced on NiTi substrate by autoclaving at 134°C for 30 minutes while the following whitlockite coatings were deposited using electrophoresis (EPD). Electrophoresis was performed under different voltage (from 20 to 80 V) at time periods (from 30 to 120 s). Applied deposition parameters 20 V and 60 s resulted in forming homogenous whitlockite coating, consisted of β-Ca3(PO4)2 and β-Ca2P2O7, on passivated NiTi alloy. In the next step, the material was heat-treated in vacuum condition at 1000°C for 2 h. As a result of sintering crystallization of titanium oxides was observed. The obtained layer was cracks-free. Applied deposition process increased the roughness of surface. Deposited whitlockite agglomerates had an average thickness ca. 5.6 μm. The structure of CaP coating material after applied heat-treatment remained unchanged in comparison to initial powder material. However, the partial decomposition of NiTi parent phase to equilibrium ones was observed. The whitlockite coating was also observed to have no impact on the martensitic transformation responsible for shape memory effect. Additionally, applied sintering condition changed the sequence of martensitic transformation from one to two-step.
Authors and Affiliations
K. Dudek, T. Goryczka
Keywords
Related Articles
- EP ID EP483499
- DOI -
- Views 73
- Downloads 0
Effect of polylactide modification with β-TCP and lecithin on the properties of the material as a substrate for osteoblasts
Polylactide (PLLA) containing β-TCP is biodegradable composite and an attractive biomaterial for bone tissue engineering, however, hydrophobicity of PLLA based composites is major limitation for their use as scaffolds fo...
Oszacowanie stabilizacji złamania trzonu kości udowej przez płytkę przykostną przy wykorzystaniu metody elementów skończonych
Złamania kości długich mogą być leczone na kilka sposobów. Jednym z nich jest zastosowanie płytki przykostnej. Płytka zamocowywana do kości umożliwia przeprowadzenie leczenia, ale z drugiej strony jest źródłem powstawani...
A tubular polycaprolactone/hyaluronic acid scaffolds for nasal cartilage tissue engineering
In this preliminary study, 3D nanofibrous porous scaffolds in the form of spiral tubes for future application as nasal cartilages implants were fabricated by combining polycaprolactone electrospun fibers with drug modifi...
Mechanical hysteresis tests for porcine tendons
Tendons may be temporarily or permanently damaged under conditions of excessive high-rate loading. It is important for surgery decisions to predict the intensity of tendons injures. It can be done by the determination an...
Wytrzymałość zmęczeniowa wielofunkcyjnej resorbowalnej płytki kompozytowej w symulowanych warunkach biologicznych
Artykuł jest kolejną częścią prezentującą wyniki badań mechanicznych wielofunkcyjnych resorbowalnych płytek zespalających. Testy dotyczyły wyznaczenia wytrzymałości zmęczeniowej płytek zespalających w warunkach symulując...