Sintering behaviour of 45S5 bioactive glass
Sintering behaviour of 45S5 bioactive glass
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DOI：
10.1016/j.actbio.2008.05.019
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发表时间：
2008-11-01
影响因子：
9.7
通讯作者：
Bernache-Assolant, D.
中科院分区：
文献类型：
--
作者：
Lefebvre, L.;Gremillard, L.;Bernache-Assolant, D.
在这项研究中，我们报告了生物玻璃（R）结构转变对其烧结行为的影响。当加热到1000摄氏度时，会发生五种连续的转变：玻璃化转变、玻璃中玻璃相分离、两次结晶过程和第二次玻璃化转变。材料的烧结表现出与550和850 ℃下的两个玻璃化转变相关的两个主要收缩阶段。在580 ℃下，玻璃中玻璃相分离导致烧结速率降低，紧接着在600和700 ℃之间从颗粒的表面到本体发生主晶相结晶（Na2CaSi2O6）。烧结的完全抑制发生后，由于结晶的轻微收缩效应。然后观察到平台期，直到达到第二玻璃化转变温度。一个修改的Frenkel的模型可以确定的玻璃在玻璃相分离动力学和识别的结构转变对烧结行为的影响。(C)2008 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
In this study, we report on the effect of Bioglass (R) structural transformations on its sintering behaviour. While heating up to 1000 degrees C, five successive transformations occur: glass transition, glass-in-glass phase separation, two crystallization processes and a second glass transition. The sintering of the material exhibits two main shrinkage stages associated with the two glass transitions at 550 and 850 C. At 580 degrees C, the glass-in-glass phase separation induces a decrease in the sintering rate immediately followed by the major crystalline phase crystallization (Na2CaSi2O6) between 600 and 700 degrees C, from the surface to the bulk of the particles. A complete inhibition of sintering takes place followed by a minor shrinkage effect due to crystallization. A plateau is then observed until the second glass transition temperature is reached. A modification of Frenkel's model allows the determination of the glass-in-glass phase separation kinetics and the identification of the structural transformations effects on sintering behaviour. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.