文献类型：期刊文献

英文题名：Structural evolution and mechanical properties of SiO2-Al2O3-MgO-B2O3 glasses with partial substitution of MgO by MgF2

作者：Zhang, Yuantao[1];Huang, Jianguo[1];Ning, Xiangchun[2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Henan Guangyuan New Mat Co Ltd, Linzhou 456500, Henan, Peoples R China

年份：2023

卷号：620

外文期刊名：JOURNAL OF NON-CRYSTALLINE SOLIDS

收录：;EI(收录号：20233814758388);WOS:【SCI-EXPANDED(收录号:WOS:001073886100001)】；

基金：This work was financially supported by the Project of the National Natural Science Foundation of China (contract Grant Number 52072123) .

语种：英文

外文关键词：Glass melt; Glass structure; Mechanical property; High-temperature viscosity

摘要：SiO2-Al2O3-MgO-B2O3-MgF2 glasses were prepared using a high-temperature melting method, and their amorphous nature was confirmed through X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) and magic angle spinning nuclear magnetic resonance (MAS-NMR) were used to investigated structural changes in the glass. It is found that substituting MgO with MgF2 disrupted the Si-O and Al-O networks in the high-temperature glass melt structure, reducing the degree of glass network polymerisation and viscosity. During cooling and annealing, moderate amounts of fluoride ions (F-) promoted the linkage of a partially fragmented glass network by converting [BO3] and [AlO5] into [BO4] and [AlO4]. An increased F- content improved the mechanical properties of the glass, including flexural strength, Young's modulus, and hardness, which peaked at 157.50 MPa, 95.21 GPa, and 838.57 HV with 2 mol% MgF2 substitution. These findings advance our understanding of the behavior of MgF2-substituted glass.