Abstract
Hydroxyapatite ceramics with oriented crystal structures are successfully fabricated via a novel and fast gel-casting process in high magnetic field for the first time. Experimental conditions as direction and duration of gel-casting in magnetic field were altered for selective crystal orientation of a,b-/c-plane of hydroxyapatites. The effect of slurry preparation process as ball-milling and freeze-drying on orientation degree and grain growth behavior of hydroxyapatite particles is elucidated with detailed analysis of the size distribution of particles, viscosity of slurry, microstructure and crystal structure of sintered bodies with assistance of SEM, XRD and advanced mapping observation of EBSD patterns. In addition, the influence of sintering temperature on the crystal phase transformation of the oriented outermost surface is also clarified through Raman spectroscopy in depth. It was found that the freeze-drying processed slurry shows potential in enhancing the crystal orientation degree than the ball-milling case, during where a suppressed grain growth phenomenon and inhibition of crystal phase transformation on highly oriented hydroxyapatite was also observed.
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