Abstract
The high biocompatibility of Hydroxyapatite (HA) makes it one of the most common ceramics used in bio-implants. However, its inferior mechanical properties can be improved through the formation of composites. In the present work, composites are fabricated by adding ZnO and Fe3O4 in HA through compaction and sintering in five different compositions to study their effect on HA. Their structural properties using scanning electron microscopy and x-ray diffraction are studied, while mechanical properties are studied using micro-hardness test and compression test. In experimental results, it was observed that 7.5% ZnO in HA has resulted in improved relative density (~ 99%), increased hardness (6.9 GPa) but with reduced compressive strength (25.6 MPa), hence it can be suitable for hard coatings on bio-implants. 20% porosity was observed in an HA-7.5%ZnO-20% $$ Fe_{3} O_{4} $$ composite with compressive strength (40 MPa) and hardness (4.1 GPa). Among all, this composition showed a maximum balance between mechanical properties and porosity.
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