In the present study, a hydrothermal hot pressing (HHP) method was used to fabricate porous hydroxyapatites with high strength. In particular, an interconnected matrix of hydroxyapatite was achieved by solution precipitation and the application of compressive stress during HHP. Hydroxyapatite samples post‐sintered after this HHP treatment had a lower relative density and higher open porosity than those prepared by normal sintering. An examination of the pore characteristics suggested that the samples after HHP treatment and post‐sintering had a high amount of open pores with a large and round morphology, whereas the samples prepared by normal sintering showed a denser microstructure, with a sharp‐edged‐pore morphology.
Silicon was doped to hydroxyapatite by hydrothermal techniques for higher biocompatibility. Products contained tetra-ethyl-orthosilicate (TEOS) as a silicon source in the range of 0 to 15 mass%. In order to evaluate bioactivity of silicon-doped hydroxyapatite, the samples were soaked in simulated body fluid (SBF). Silicon doped samples showed faster apatite forming ability than the undoped samples. The samples were examined by transmission electron microscopy (TEM), X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray absorption fine structure (XAFS). There results indicated that SiO 4 4À ion substituted PO 4 3À ion site in apatite structures. And it was found that appropriate TEOS doping ratio was 10 mass% for superior biocompatibility due to amorphous SiO 2 segregation in the 15 mass% TEOS doped samples.
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