Rheology of a sodium‐molybdenum borosilicate melt undergoing phase separation

Author:

Pereira Luiz1ORCID,Schuller Sophie2ORCID,Wadsworth Fabian B.3ORCID,Vasseur Jérémie1ORCID,Lancelotti Ricardo F.4ORCID,Hess Kai‐Uwe1,Gossé Stéphane5ORCID,Dingwell Donald B.1ORCID

Affiliation:

1. Department of Earth and Environmental Sciences Ludwig‐Maximilians‐Universität München Munich Germany

2. CEA, DES, ISEC, DPME University of Montpellier Marcoule France

3. Department of Earth Sciences Durham University Durham UK

4. Department of Materials Engineering (DEMa) Federal University of São Carlos (UFSCar) São Carlos São Paulo Brazil

5. Université Paris‐Saclay, CEA Service de Recherche en Corrosion et Comportement des Matériaux Gif‐sur‐Yvette France

Abstract

AbstractDuring glass production, phase separation can result in the formation of suspended liquid droplets, which can cause changes in the system rheology. In nuclear waste vitrification context, some new glassy matrices may present this phase separation matter, but the mechanisms controlling the viscosity changes have not yet been determined. Here, we measure the viscosity of a sodium‐borosilicate melt containing dissolved MoO3 at different temperatures and subject to different applied shear strain rates. We observe that (i) the viscosity increases sharply as the temperature decreases and (ii) at any constant temperature below 1000°C, the system presents non‐Newtonian response. Using transmission electron microscope observations coupled with viscosity calculations, we interpret the cause of the observed changes as the result of phase separation. We show that the viscosity increase on cooling is in excess of the predicted temperature dependence for a homogeneous melt of the starting composition. The increase is due to the formation of a second phase and is controlled by chemical and structural modifications of the matrix during the loss of the elements that form the droplets. This work provides insights into the rheology of a system composed of two composition sets due to a miscibility gap.

Funder

Alexander von Humboldt-Stiftung

Publisher

Wiley

Subject

General Materials Science

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3