Low temperature sintering of fluorapatite glass-ceramics.
Low temperature sintering of fluorapatite glass-ceramics.
复制标题
DOI：
10.1016/j.dental.2013.10.009
复制
发表时间：
2014-02
期刊：
影响因子：
5
通讯作者：
Holloway, Julie A.
中科院分区：
文献类型：
--
作者：
Denry, Isabelle;Holloway, Julie A.
氟磷灰石玻璃陶瓷是骨移植支架材料的理想选择，但玻璃的同时结晶阻碍了烧结法制备骨移植支架。研究了Ca/Al比对Nb掺杂氟磷灰石基SiO2-Al 2 O3-P2 O 5-MgO-Na 2 O-K2 O-CaO-CaF 2系统玻璃烧结行为的影响。通过在1525°C下两次熔融3小时制备Ca/Al比为1（A）、2（B）、4（C）和19（D）的玻璃组合物。玻璃要么被铸造成圆柱形的锭，要么被磨成粉末。盘形试样通过从锭块切片或在模具中粉末压制来制备，然后在700 °C至1050°C的温度下热处理1小时。在烧结试样和作为对照的热处理圆盘上测量密度。从这些测量确定烧结程度。XRD分析表明，氟磷灰石在所有微晶玻璃中均结晶。玻璃陶瓷D在775°C下实现了高烧结度（98.99±0.04%），玻璃陶瓷C在900°C下实现了高烧结度（91.31±0.10）。玻璃-陶瓷A或B在1000°C下仅部分烧结（分别为63.6±0.8%和74.1± 1.5%）。SEM显示微晶玻璃C和D中的氟磷灰石晶体为微米级球粒状晶体。增加Ca/Al比促进了传统上难以烧结的氟磷灰石玻璃陶瓷的低温烧结。
Fluorapatite glass-ceramics have been shown to be excellent candidates as scaffold materials for bone grafts, however, scaffold production by sintering is hindered by concurrent crystallization of the glass. Our goal was to investigate the effect of Ca/Al ratio on the sintering behavior of Nb-doped fluorapatite-based glasses in the SiO2-Al2O3-P2O5-MgO-Na2O-K2O-CaO-CaF2 system. Glass compositions with Ca/Al ratio of 1 (A), 2 (B), 4 (C) and 19 (D) were prepared by twice melting at 1525°C for 3h. Glasses were either cast as cylindrical ingots or ground into powders. Disc-shaped specimens were prepared by either sectioning from the ingots or powder-compacting in a mold, followed by heat treatment at temperatures ranging between 700 and 1050°C for 1h. The density was measured on both sintered specimens and heat treated discs as controls. The degree of sintering was determined from these measurements. XRD showed that fluorapatite crystallized in all glass-ceramics. A high degree of sintering was achieved at 775°C for glass-ceramic D (98.99±0.04%), and 900°C for glass-ceramic C (91.31±0.10). Glass-ceramics A or B were only partially sintered at 1000°C (63.6±0.8% and 74.1±1.5%, respectively). SEM revealed a unique microstructure of micron-sized spherulitic fluorapatite crystals in glass-ceramics C and D. Increasing the Ca/Al ratio promoted low temperature sintering of fluorapatite glass-ceramics, which are traditionally difficult to sinter.
登录
查看更多内容
影响因子：
3.5
作者：
Brauer, D. S.;Anjum, M. N.;Hill, R. G.
通讯作者：
Hill, R. G.
DOI：
10.1002/jbm.b.30295
发表时间：
2005-10-01
影响因子：
3.4
作者：
Denry, IL;Holloway, JA;Walters, JD
通讯作者：
Walters, JD
影响因子：
3.5
作者：
Hill, Robert G.;O'Donnell, Matthew D.;Tulyaganov, Dilshat U.
通讯作者：
Tulyaganov, Dilshat U.
影响因子：
5.2
作者：
Bogdanov, B. I.;Pashev, P. S.;Markovska, I. G.
通讯作者：
Markovska, I. G.
影响因子：
3.5
作者：
Hill, Robert G.;Brauer, Delia S.
通讯作者：
Brauer, Delia S.