Influence of precursor characteristics on properties of porous calcium phosphate-titanium dioxide composite bioceramics |
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Affiliation: | 1. I3N and Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal;2. Institute of Biomedical Engineering and Nanotechnologies, Riga Technical University, Riga, LV, 1658, Latvia;3. Physics Department, Federal University of Mato Grosso - UFMT, 78060-900, Cuiabá, MT, Brazil;1. Univ. Limoges, CNRS, SPCTS, UMR 7315, F-87000 Limoges, France;2. CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, ENSIACET, 31030 Toulouse, France |
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Abstract: | Highly porous (macroporosity 76–90%) bioceramics containing interconnected pores (>100 μm) with compressive strength between 0.54 and 0.32 MPa were prepared by polyurethane foam replica method. Effect of following variables, i.e., calcium phosphate/anatase ratio (30/70, 50/50, 70/30 wt%) in the ceramic slurry, anatase particle size (15 nm, 180 nm), Ca/P molar ratio of calcium phosphate (1.67 and 1.50 for hydroxyapatite and apatitic-tricalcium phosphate (ap-TCP), respectively), on the bioceramics properties was investigated. Bioceramics prepared using anatase and hydroxyapatite consisted of three high-temperature crystalline phases - β-tricalcium phosphate (β-TCP), rutile and CaTiO3. In case of anatase and ap-TCP, two phases (β-TCP and rutile) were obtained. Interaction of anatase and hydroxyapatite during sintering caused formation of CaTiO3 at β-TCP and rutile grain boundaries thus contributing to a denser grain packing. Combination of ap-TCP and nanosized anatase facilitated decrease of grain sizes. Correlation was found between compressive strength and calcium phosphate precursor in the ceramic slurry. |
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Keywords: | Microstructure-final Composites Mechanical properties Biomedical application |
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