热处理硼硅酸钠玻璃的相关系

IF 0.3 4区 材料科学 Q4 CHEMISTRY, PHYSICAL
S. Sander, F. Syrowatka, D. Enke, H. Roggendorf
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引用次数: 0

摘要

硼硅酸钠玻璃通过相分离和选择性浸出加工成多孔玻璃和Vycor™型玻璃。这两种材料主要由SiO2组成。热处理诱导相分离是组织发育的关键。将8Na2O.21B2O3.71SiO2和8Na2O.28B2O3.64 SiO2的硼硅酸钠玻璃熔化,快速冷却,用热分析和扫描电镜对其进行了研究。玻璃在630 ~ 730℃下热处理120 h,然后在60℃下0.1 M HCl中浸出72 h,随后在30℃下0.5 M NaOH中浸出4 h。用x射线荧光测定了化学成分。首先用差热分析和膨胀法分析了微观结构的发育,用汞孔隙度法和氮气吸附法对孔隙结构进行了表征。然后用低压扫描电子显微镜对热处理过的玻璃进行分析,在一个案例中结合了能量色散x射线分析的化学分析。从相关系的角度对结果进行了讨论。经过长期热处理后,在不同尺寸和时间尺度上,至少有三个相存在于两个独立的亚稳态两相平衡中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phase relations in heat treated sodium borosilicate glasses
Sodium borosilicate glasses are processed to porous glasses as well as to Vycor™ type glasses via phase separation and selective leaching. Both materials consist mainly of SiO2. Thermal treatment inducing phase separation is crucial for microstructure development. Sodium borosilicate glasses with molar compositions of 8Na2O.21B2O3.71SiO2 and 8Na2O.28B2O3.64 SiO2 were melted, rapidly cooled and investigated by thermal analysis and scanning electron microscopy. The glasses were thermally treated for 120 h at 630 to 730°C, and then leached, first for 72 h in 0·1 M HCl at 60°C, and subsequently for 4 h in 0·5 M NaOH at 30°C. X-ray fluorescence was applied to characterise the chemical compositions. Microstructure development was first analysed by differential thermal analysis and dilatometry, and the pore structure was characterised by Hg porosimetry and N2 adsorption. Heat treated glasses were then analysed by low voltage scanning electron microscopy, combined in one case with chemical analysis by energy dispersive x-ray analysis. The results are discussed with respect to phase relations. After long term heat treatment, at least three phases exist in two independent metastable two-phase equilibria on different size and time scales.
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来源期刊
CiteScore
0.70
自引率
33.30%
发文量
0
审稿时长
1 months
期刊介绍: Physics and Chemistry of Glasses accepts papers of a more purely scientific interest concerned with glasses and their structure or properties. Thus the subject of a paper will normally determine the journal in which it will be published.
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