This paper presents on the direct laser melted hydroxyapatite coatings achieved by melting the pre-placed powder beds
using Nd-YAG laser. The process development and optimized parameters are reported. The results show that by
changing the laser power and the beam inclined plane it is possible that a desirable coating of HAP that is rich on the
surface can be produced. The microstructures of the coatings showed balling and cracking at beam angles between 0-15°
and at 27° a successful coating was achieved with laser power and scanning speed of 750W and 5mm/s respectively. The
said coating was pore and crack free while it retained non-decomposed HAP crystallites on the surface (mixed). The
microstructure of the transition layer concluded a moderate temperature process since the formed dendrites did not
develop or form secondary arms. The Ca/P conducted on the coating using EDS concluded Ca/P ratio of 8.04 and the
absence of titanium phosphates phase (TiP2). TiP2 is typically associated with the decomposition of HAP and indicate the
presence of high processing temperatures. Even so, the current results indicated that the investigated process was
successful in depositing HAP coating with desirable microstructures even though its bio-corrosion properties still need to
be ascertained before it could be qualified as suitable for biomedical applications.
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