Crystallization behavior of SiO2–P2O5–CaO–MgO–Na2O–K2O bioactive glass powder

Q1 Materials Science

Biomedical Glasses Pub Date : 2019-01-01 DOI:10.1515/bglass-2019-0004

E. Fiume, E. Verné, F. Baino

引用次数: 16

Abstract

Abstract The crystallization process of a bioactive silicate glass with 47.5SiO2-10Na2O-10K2O-10MgO-20CaO-2.5P2O5 molar composition was investigated by using nonisothermal differential t hermal a nalysis (DTA). T he DTA plots recorded at different heating rates exhibited a single crystallization peak. The activation energy for crystallization was estimated by applying the equations proposed by Kissinger and Matusita-Sakka. The Johnson-Mehl-Avrami exponent (n) was assessed by using the Ozawa and Augis-Bennett methods. The analyses suggest that a surface crystallization mechanism with one-dimensional crystal growth is predominant. The activation energy for viscous flow was also assessed (176 kJ/mol) and was found lower than the activation energy for crystallization (271 kJ/mol). This confirms the stability of 47.5B against crystallization and its good sinterability, which is a highly attractive feature for producing glass products of biomedical interest, such as bioactive porous scaffolds for bone repair.

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SiO2–P2O5–CaO–MgO–Na2O–K2O生物活性玻璃粉末的结晶行为

摘要采用非等温差热分析（DTA）研究了47.5SiO2-10Na2O-10K2O-10MgO-20CaO-2.5P2O5摩尔比组成的生物活性硅酸盐玻璃的结晶过程。在不同加热速率下记录的DTA图显示出单一结晶峰。应用Kissinger和Matusita Sakka提出的方程估算了结晶的活化能。Johnson—Mehl—Avrami指数（n）采用Ozawa和Augis—Bennett方法进行评估。分析表明，一维晶体生长的表面结晶机制占主导地位。还评估了粘性流的活化能（176kJ/mol），发现其低于结晶的活化能。这证实了47.5B对结晶的稳定性及其良好的可烧结性，这对于生产生物医学感兴趣的玻璃产品（如用于骨修复的生物活性多孔支架）是非常有吸引力的特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomedical Glasses Materials Science-Surfaces, Coatings and Films

自引率

0.00%

发文量

审稿时长

17 weeks

期刊介绍： Biomedical Glasses is an international Open Access-only journal covering the field of glasses for biomedical applications. The scope of the journal covers the science and technology of glasses and glass-based materials intended for applications in medicine and dentistry. It includes: Chemistry, physics, structure, design and characterization of biomedical glasses Surface science and interactions of biomedical glasses with aqueous and biological media Modeling structure and reactivity of biomedical glasses and their interfaces Biocompatibility of biomedical glasses Processing of biomedical glasses to achieve specific forms and functionality Biomedical glass coatings and composites In vitro and in vivo evaluation of biomedical glasses Glasses and glass-ceramics in engineered regeneration of tissues and organs Glass-based devices for medical and dental applications Application of glasses and glass-ceramics in healthcare.