Structure and morphology of whitlockite coating electrophoretically deposited on NiTi shape memory alloy

• Autorzy: Dudek K. , Goryczka T.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

β-TCP (whitlockite); electrophoretic deposition (EPD); shape memory alloy (SMA); surface modification

• Wydawca: Polish Society for Biomaterials in Cracow
• Czasopismo: Engineering of Biomaterials
• Rocznik: 2017
• Tom: Vol. 20, no. 140
• Strony: 2--6
• Opis fizyczny: Bibliogr. 18 poz., tab., wykr., zdj.

Twórcy

autor

Dudek K.

• University of Silesia, Institute of Materials Science, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland

autor

Goryczka T.

• University of Silesia, Institute of Materials Science, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).