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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Rapid vacuum sintering: A novel technique for fabricating fluorapatite ceramic scaffolds for bone tissue engineering
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Rapid vacuum sintering: A novel technique for fabricating fluorapatite ceramic scaffolds for bone tissue engineering

机译：快速真空烧结：一种用于骨组织工程制造荧光石陶瓷支架的新技术

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Macroporous bioceramic scaffolds are often fabricated via the foam replica technique, based on polymeric foam impregnation with a glass slurry, followed by slow heat treatment to allow for drying, polymeric burnout, and sintering of the glass particles. As a consequence, the process is time consuming and complicated by concurrent crystallization of the glass, often leading to incomplete sintering. Our goal was to investigate the effect of heating rate on sintering behavior, architecture, and mechanical properties of fluorapatite-based glass and glass-ceramic scaffolds. Glass scaffolds were prepared and sintered by rapid vacuum sintering (RVS) at 785 degrees C under vacuum at a fast heating rate (55 degrees C/min.) or without vacuum at a slow heating rate (2 degrees C/min.). Two additional groups were further crystallized at 775 degrees C/1 h. XRD confirmed the presence of fluorapatite for crystallized scaffolds. All groups presented interconnected porosity with a pore size in the 500 m range. Scaffolds produced by RVS exhibited an excellent degree of sintering while scaffolds produced by slow sintering were incompletely sintered. The mean compressive strength was significantly higher for the RVS groups (1.52 +/- 0.55 and 1.72 +/- 0.61 MPa) compared to the slow-sintered groups (0.54 +/- 0.30 and 0.45 +/- 0.26 MPa). Meanwhile, the total production time was reduced by more than 12 h by using the RVS technique. (c) 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 291-299, 2018.
机译：基于聚合物泡沫浸渍的聚合物泡沫浸渍，通常通过具有玻璃浆料的泡沫浸渍，然后进行缓慢的热处理，以允许干燥，聚合物剥离和烧结玻璃颗粒的烧结。结果，该过程是通过玻璃的并发结晶来耗时和复杂，通常导致不完全烧结。我们的目标是探讨加热率对荧光石玻璃和玻璃陶瓷支架的烧结行为，建筑和力学性能的影响。通过快速真空烧结（RVS）在785℃下以快速加热速率（55摄氏度，55℃/ min。在775℃/ 1小时下进一步结晶两组。 XRD证实了用于结晶支架的氟磷灰石的存在。所有组均在500米范围内呈现孔径的相互连接的孔隙率。由RV产生的支架表现出优异的烧结程度，而通过缓慢烧结产生的支架被不完全烧结。与缓慢烧结基团（0.54 +/- 0.30和0.45 +/- 0.26MPa相比，RVS组（1.52 +/- 0.55和1.72 +/- 0.61MPa）的平均抗压强度显着高。同时，通过使用RVS技术，总生产时间减少了12小时。 （c）2017年Wiley期刊，Inc。J生物保解员B部分：苹果生物检索物，106B：291-299，2018。

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