Structural changes of hydroxyapatite coating electrophoretically deposited on NiTi shape memory alloy |
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Authors: | Karolina Dudek Mateusz Dulski Tomasz Goryczka Anna Gerle |
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Affiliation: | 1. Institute of Ceramics and Building Materials, Refractory Materials Division in Gliwice, Toszecka 99, 44-100 Gliwice, Poland;2. Institute of Material Science, University of Silesia in Katowice, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland;3. Silesian Centre for Education and Interdisciplinary Research, University of Silesia, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland |
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Abstract: | The surface of the NiTi shape memory alloy was functionalized through the deposition of hydroxyapatite (HAp) coatings using the electrophoretic method (EPD). The electrophoresis carried out at the voltage of 40?V during the time of 120?s did not affect the crystalline structure of the initial HAp powder and, at the same time, ensured obtaining a homogeneous layer without visible cracks or discontinuities. Next, the coatings were subjected to heat treatment at 800?°C for 2?h in vacuum, wherein the applied conditions did not affect the decomposition of the deposited hydroxyapatite. The heat treatment resulted in the formation of carbonate apatite (C-HAp) in the HAp layer and in ceramic particles’ coalescence. Changes in the morphology and roughness of the layer as well as partial decomposition of the NiTi substrate parent phase into Ti2Ni and Ni4Ti3 phases were also observed. |
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Keywords: | Hydroxyapatite (HAp) Carbonate hydroxyapatite (C-HAp) NiTi shape memory alloy (SMA) Surface modification Electrophoretic deposition (EPD) Raman profilometry |
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