科研之友
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摘要
Silver doped hydroxyapatite (HAp-Ag) containing different amounts of Ag (0.5 wt% and 0.8 wt%) was prepared using wet chemical precipitation method. In the synthesis process CaO, H3PO4 and AgNO3 were used as raw materials. Porous HAp and HAp-Ag scaffolds via viscous mass foaming technique were prepared from as-synthesized powders and obtained samples were sintered at different temperatures. According to the XRD data and SEM microstructure analysis, silver ions from HAp-Ag structure were excluded and additional silver phase during the sintering process was formed. Impact of sintering temperature (1000 degrees C and 1200 degrees C) on the porosity, density, specific surface area and mechanical properties of porous HAp and HAp-Ag scaffolds was evaluated. Total porosity of 71% (at 1000 degrees C) and 54% (at 1200 degrees C) was achieved. Incorporation of Ag into the HAp structure resulted in the decrease of porous scaffold compressive strength by 30-50% compared to pure HAp porous scaffolds. Increasing the sintering temperature of porous scaffolds up to 1200 degrees C, it was possible to obtain samples with 2-4 times higher compressive strength, compared to samples sintered at 1000 degrees C.
- 出版日期2014-8
