Lee Hung-Bin, Hsu Hsueh-Chuan, Wu Shih-Ching, Hsu Shih-Kuang, Wang Peng-Hsiang, Ho Wen-Fu
Department of Materials Science and Engineering, Da-Yeh University, Changhua 51591, Taiwan.
Department of Dental Technology and Materials Science, Central Taiwan University of Science and Technology, Taichung 40601, Taiwan.
Materials (Basel). 2016 Nov 24;9(12):956. doi: 10.3390/ma9120956.
We propose a simple and low-cost process for the preparation of porous Ti foams through a sponge replication method using single-step air sintering at various temperatures. In this study, the apatite-forming ability of air-sintered Ti samples after 21 days of immersion in simulated body fluid (SBF) was investigated. The microstructures of the prepared Ca-P deposits were examined by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, and cross-sectional transmission electron microscopy (TEM). In contrast to the control sample sintered in vacuum, which was found to have the simple hexagonal α-Ti phase, the air-sintered samples contained only the rutile phase. High intensities of XRD peaks for rutile TiO₂ were obtained with samples sintered at 1000 °C. Moreover, the air-sintered Ti samples had a greater apatite-forming ability than that of the Ti sample sintered in vacuum. Ti samples sintered at 900 and 1000 °C had large aggregated spheroidal particles on their surfaces after immersion in SBF for 21 days. Combined XRD, energy-dispersive X-ray spectroscopy, FTIR spectroscopy, and TEM results suggest that the calcium phosphate deposited on the rutile TiO₂ surfaces consist of carbonated calcium-deficient hydroxyapatite instead of octacalcium phosphate.
我们提出了一种简单且低成本的工艺，通过海绵复制法，在不同温度下单步空气烧结制备多孔泡沫钛。在本研究中，对在模拟体液（SBF）中浸泡21天后的空气烧结钛样品的磷灰石形成能力进行了研究。通过X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、傅里叶变换红外（FTIR）光谱和横截面透射电子显微镜（TEM）对制备的钙磷沉积物的微观结构进行了检查。与在真空中烧结的对照样品（发现具有简单六方α-Ti相）相比，空气烧结样品仅含有金红石相。在1000℃烧结的样品获得了高强度的金红石TiO₂的XRD峰。此外，空气烧结的钛样品比在真空中烧结的钛样品具有更强的磷灰石形成能力。在SBF中浸泡21天后，在900℃和1000℃烧结的钛样品表面有大的聚集球状颗粒。结合XRD、能量色散X射线光谱、FTIR光谱和TEM结果表明，沉积在金红石TiO₂表面的磷酸钙由碳酸化缺钙羟基磷灰石组成，而不是磷酸八钙。
