Structure of CaPs Coatings Electrophoretically Deposited on NiTi Shape Memory Alloy
K. Dudek and T. Goryczka
University of Silesia, Institute of Materials Science, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
Full Text PDF
The surface of NiTi shape memory alloys applied as long-term implants has been modified by protective calcium phosphates (CaPs) coatings, with the objective of improving the biocompatibility of this material. The calcium phosphates such as hydroxyapatite Ca5(PO3)OH (HAP) and β-tricalcium phosphate β-Ca3(PO4)2 (β-TCP) were deposited by electrophoretic deposition. In order to improve the adhesion, the deposited samples were vacuum-sintered at wide range of temperature from 500°C to 1000°C for 2 h. The studies revealed that applied sintering conditions did not change the structure of CaPs. The coatings consisted of HAP with hexagonal structure (P63/m) and β-TCP with rhombohedral structure (R-3c). Changes in lattice parameters for CaPs coatings after deposition and sintering were refined by the Rietveld method.

DOI: 10.12693/APhysPolA.130.1053
PACS numbers: 87.15.Tt, 87.68.+z, 61.10.Nz