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Preparation and characterization of porous Ag doped hydroxyapatite bioceramic scaffolds

机译：多孔银掺杂羟基磷灰石生物陶瓷支架的制备与表征

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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, H_3PO_4 and AgNO_3 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 °C and 1200 °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 °C) and 54% (at 1200 °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 °C, it was possible to obtain samples with 2-4 times higher compressive strength, compared to samples sintered at 1000 °C.
机译：使用湿化学沉淀法制备了包含不同量的Ag（0.5重量％和0.8重量％）的银掺杂羟基磷灰石（HAp-Ag）。在合成过程中，CaO，H_3PO_4和AgNO_3被用作原料。由合成粉末制备了粘性粘性发泡技术的多孔HAp和HAp-Ag支架，并在不同温度下烧结了所得样品。根据XRD数据和SEM微观结构分析，排除了HAp-Ag结构中的银离子，并在烧结过程中形成了额外的银相。评估了烧结温度（1000°C和1200°C）对多孔HAp和HAp-Ag支架的孔隙率，密度，比表面积和力学性能的影响。总孔隙率达到71％（在1000°C下）和54％（在1200°C下）。与纯HAp多孔支架相比，将Ag掺入HAp结构导致多孔支架的抗压强度降低了30-50％。将多孔支架的烧结温度提高到1200°C，与在1000°C下烧结的样品相比，可以获得抗压强度高2-4倍的样品。

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