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Surface characterization of the nano-HA film coated on titanium by a new method
EAO Online Library. XU J. Oct 9, 2018; 232524; P-BR-122
Jiayun XU
Jiayun XU
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Nano-hydroxyapatite shows excellent biological properties and was applied as a coating material. A couple of coating methods were introduced, however, one of the most popular methods, plasma spraying, produced ‘thick’ coating which was reported to detach from the surface, while recent ‘thin’ coating methods require much fabrication time, expensive equipment and high temperature that causes particle decomposition. Simple and economical coating methods are required for the industrial manufacture.The aim of this study is to develop a new coating method by vacuum suction combined with ultrasonic spraying under a heatless condition, and then evalute the surface properties including the surface crystal phase, the elemental composition and the morphology of the new surface.Nano-HA was prepared by a wet method and the physicochemical characterization of the products were examined including XRD, FTIR and TEM. Then the titanium plates (10 x 10 cm2) were acid etched by a mixture of 18% HCl and 49% H2SO4 (v-v=1-1) at 70 °C for 10 min. The whole coating process included three steps- 1). In a vacuum vessel, 0.5 ml nano-HA solution (1g L) was dropped vertically and sputtered onto the Ti surface by the applied force of the vacuum suction for 5 times+ 2). The surplus particles were gently washed by using a brush under flowing water+ 3). The plates were finally sprayed by 0.25 ml nano-HA solution using an ultrasound machine and then dried during the vacuum process, the spray and dry circle was repeated for 20 times, 5 ml spraying solution in total. The nano-HA coated titanium surface was examined by XRD and EDX to test the crystal phase and elemental composition respectively. The morphology was observed by SEM.1. The XRD patttern showed the prepared material was identified as pure HA and FTIR results showed the peaks of OH- and PO43-. The TEM images showed the HA particle has a plate-like shape with a length of 40 - 50 nm and a width of 10 - 20 nm. 2. The EDX results showed the surface contained mainly Ca, P, Ti and O. 3. A porous morphology with a pore diameter of 1 - 2 μ+m was produced by the acid etching. 4. From the SEM images, all the pores were observed to be filled up with nano-HA particles after the first step but the coating was not homogenous. In the second step, surplus nano-HA particles were removed by washing under the flowing water and the ridges of the porous titanium was revealed on the surface, between the ridges filled up with smooth flat nano-HA. In the third step the whole surface was covered by a homogenous nano-HA coating and the size of the nano-HA particle stayed even, no agglutination was observed.An effective and simple coating method has been developed by using the vacuum suction combined with ultrasound spraying in this study. The device used in this study was less expensive and simple. Moreover, the method was operated completely under a heatless condition so that the prepared nano-HA coating was thin and homogenous. Thus, this new method is advantageous for the nano-HA coating.
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