Abstract
In this study, we report a manufacturing process for coating nanostructured and hierarchically porous Hydroxyapatite (HA) films on cobalt-chromium (CoCr) substrates. Nanoparticles of HAP are prepared using three different methods: ball milling of sol–gel synthesized HAP, mechanical alloying of calcium oxide (CaO) and diammonium phosphate (DAP), and mechanical alloying of eggshell and diammonium phosphate. The nanoparticle's characterization showed the presence of nanophase HAP in sol–gel synthesized powders and synthesis of apatite phases in mechanically alloyed powders. Small droplets of nanoparticle ethanol suspensions were injected on the substrate and irradiated with high-repetition-rate picosecond pulsed laser to coat the CoCr samples. Characterization of the deposited films showed bonding of HAP nanoparticles to a film with nanostructured morphology and hierarchical porosity and the incorporation of CoCr from the substrate into the first few deposited layers of HAP nanoparticles. The two-step manufacturing process results in bioactive and biocompatible HAP films with morphology that is desirable for the growth and infiltration of biological cells.
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