Abstract

BALBINOTTI, Pedro et al. Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy. Mat. Res. [online]. 2011, vol.14, n.3, pp.384-393.  Epub Aug 05, 2011. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392011005000044.

Titanium-based composites with in-situ calcium and phosphor phases were prepared by powder metallurgy processing with titanium and hydroxyapatite (HA) powders. The mixtures were performed in a friction mill with alcohol for 5 hours, dried in a rotating evaporator, pressed at 600 MPa and sintered at 1200 ºC for 2 hours in argon atmosphere. Crystal phases of the as-fabricated composite are found to be, α-Ti, CaTiO₃, Ca₃(PO₄)₂ and Ti_xP_y phase(s). The analyses revealed that titanium particles were covered with a compact layer of Ti_xP_y and CaTiO₃ phases, which resulted from the decomposition of HA into CaTiO₃ and β-Ca₃(PO₄)₂ at approximately 1025 ºC. Then the reactions were followed by the decomposition of β-Ca₃(PO₄)₂, resulting in the growth of CaTiO₃ layer and in the nucleation and growth of Ti_xP_y phase(s).

Keywords : titanium; hydroxyapatite; composite; powder metallurgy.

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