Microstructure and phase composition of Ti-based biocomposites with different contents of nano-hydroxyapatite
(1. Department of Materials Science and Engineering, Jinan University, Guangzhou 510632, China;
2. GRIPM Advanced Materials Co., Ltd., General Research Institutes for Nonferrous Metals, Beijing 101407, China)
2. GRIPM Advanced Materials Co., Ltd., General Research Institutes for Nonferrous Metals, Beijing 101407, China)
Abstract: Nano-hydroxyapatite (nHA) and titanium (Ti) powders with different ratios were prepared by mechanical ball milling, and then sintered in vacuum environment. The microstructure and phase composition of Ti-based biocomposites with different contents of nHA(5% and 10%, in volume fraction) were investigated. Meanwhile, the phase composition of pure Ti was studied for contrast. The results show that Ti phase forms a finer continuous network microstructure with few porous after milling and sintering. The higher amount of nHA powders are added, the higher amount of porous are achieved, while the fracture morphology becomes coarser. The specimen with contents of 10% nHA has serious interface reaction after sintering at 1 100 ℃, it varies with the pure Ti specimen. Combined with the XRD and EDS analysis, it can be founded that elements Ca, P, O and Ti diffuse on the interface, and the phases of Ti, Ti2O, Ti5P3, CaTiO3 and TiOx can be ascertained in nHA/Ti composites.
Key words: Ti-based biocomposites; nano-hydroxyapatite; interface reaction; powder metallurgy