权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Measurements of the deformation stress of molten mold fluxes

熔融保护渣变形应力的测量

基本信息

批准号：
13450303
负责人：
SASAKI Yasushi
金额：
$ 8.32万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450303/
关键词：
Mold Flux Deformation stress Glass phase Raman spectroscopy Rheological body

项目摘要

To determine the effect of F ions in the molten alkali silicate systems, quenched Na__2O-SiO__2-NaF systems were investigated by Raman spectroscopy and molecular dynamics simulation in 2002 term. The systematic increase of 1100 cm^<-1> band intensity in the Raman spectra of the silicate melts accompanying the replacement of F for O provides the evidence for concomitant polymerization of melts. From the molecular dynamics simulation, it was confirmed that most of substituted F was mainly coordinated to Na^+ ions but not Si^<4+> ions at least up to 10 mol% of F. A small amount of F was found to be coordinated to Si as a non-bridging ion from the MD simulation, although there was no recognizable evidence from Raman spectroscopy. These results are consistent with the mechanism in which F associated with otherwise network-modifying Na rather than with network-forming Si. Since F was associated to Na^+ ions, the replace of O ion by two F ions promote the polymerization of silicate melts.In 2003 term, by using a newly developed ultra micro stress measurement system, the deformation behavior of molten CaO-Al_2O_3-SiO_2 system at 1673K with varying Al_2O_3 content and compress speed was investigated. It was found that the deformation stress was increased with increase of Al_2O_3 content. Al ion is know to have a preference to construct three-dimensional network structure. This is the one of the reason of increase of deformation stress with Al_2O_3.

为了确定F离子在熔融碱硅酸盐体系中的作用，2002年我们用拉曼光谱和分子动力学模拟研究了猝灭的Na_2 O-SiO_2-NaF体系。硅酸<-1>盐熔体的拉曼光谱中1100 cm ↑ [2]谱带强度的系统性增加伴随着F对O的取代，这为熔体的伴随聚合提供了证据。分子动力学模拟结果表明，至少在10 mol%F时，大多数取代F主要与Na^+离子配位，而与Si^<4+>离子不配位。从MD模拟中发现少量的F作为非桥接离子与Si配位，尽管从拉曼光谱中没有可识别的证据。这些结果是一致的机制，其中F与其他网络修改钠，而不是与网络形成硅。2003年，利用新研制的超微应力测量系统，研究了CaO-Al_2 O_3-SiO_2系熔体在1673 K下随Al_2O_3含量和压缩速度变化的变形行为。结果表明，随着Al_2O_3含量的增加，变形应力增大。已知Al离子具有构建三维网络结构的偏好。这也是Al_2O_3提高变形应力的原因之一。