Abstract: Ca₁₀(PO₄)₆(OH)₂·Ca₂(PO₄)₃-MgAl₂O₄ (HAP·TCP-Spinel) composite biomaterials were synthesized by chemical
deposition and followed by powder metallurgy technique. Microstructures were characterized by fourier transform infrared spectroscopy
(FTIR), X-ray diffraction(XRD), scan electron microscopy(SEM), and transmission electron microscopy(TEM). TEM observation shows that a perfect
combination is presented in the interface between HAP crystals and Spinel crystals. The effects of composition on mechanical properties
investigated show that the highest compressive strength and bending strength are σ_b=212MPa and σ_t=352MPa respectively, matching
the composition of 62.5wt% of HAP in the composite. Similar to HAP, the composite is available to adsorb serum protein and albumin protein, though the amount of protein adsorption
on the surface of the composite is significantly less than that on surface of HAP.

Key words: HAP·TCP-Spinel composite biomaterials, mechanical properties, protein adsorption