A. O. Lobo, E. Corat, Instituto Tecnologico de Aeronautica/Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Brazil; J. T. Matsushima, Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Brazil; J. Otubo, Instituto Tecnologico de Aeronautica, Sao Jose dos Campos, Brazil
Producing bioactive nano-hydroxyapatite (n-HA) coating on NiTi shape memory alloy combines the mechanical advantages of implant materials and biological affinity of the n-HA surface to the similarity natural tissue. A thin n-HA film on NiTi shape memory alloy have been grown in this work by an electrodeposition method involving both physical and chemical process. This method has as advantages to produce a thin, homogeneous and adherent film besides the rapid, reproducible, efficient and low cost method. The electrodeposition of the n-HA films was performed using 2.5 mmol.L-1 Ca(NO3)2.4H2O and 1.5 mmol.L-1 (NH4)2HPO4. The films were prepared applying a constant potential of -3.0 V by 120 minutes and the solution temperature was kept at 37oC and 80o C, respectively. The XRD, Raman spectroscopy, IR, AFM, SEM, EDX, and TEM analysis were employed to investigate the electrodeposition conditions on the formation of n-HA crystals, structural characteristics, quantitative and morphology on NiTi alloy. The results showed a homogeneous thin film and high crystallinity of n-HA on NiTi alloys. The n-HA coatings with special structures would benefit for the application of NiTi alloys in the orthopedic area.
Summary: In this work will shown the producing bioactive nano-hydroxyapatite (n-HA) coating on NiTi shape memory alloy applying electrodeposition process. The XRD, Raman spectroscopy, IR, AFM, SEM, EDX, and TEM analysis shown a homogeneous thin film and high crystallinity of n-HA on NiTi alloys.
