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首页> 外文期刊>ISIJ international >Viscosity of Na-Si-O-N-F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine
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Viscosity of Na-Si-O-N-F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine

机译：Na-Si-O-N-F的粘度熔融：氧气，氮和氟的混合效果

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摘要

Fluorine and nitrogen are important elements of metallurgical slags and fluxes. Studies on their viscosity have often focused on the additive effect of fluoride and nitride compounds (e.g., CaF_2 and Si_3N_4), whereas the influence of anionic composition (i.e., oxygen, fluorine, and nitrogen concentrations) with a fixed cationic composition remains unclear. The present study reports the scarcely quantified viscosity variations due to changes in the anionic composition of a simple sodium silicate system by rotating crucible method under a controlled atmosphere. ~(29)Si magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy was used to characterize the structural changes against varying nitrogen and fluorine concentrations in the quenched glassy sample. The observed change in the local silicon structure was consistent with the expected variation from the conventional structural roles of nitrogen and fluorine in silicate glasses: nitrogen atoms tend to bond with silicon atoms, whereas fluorine atoms prefer to exist in surrounding sodium cations. Moreover, nitrogen tends to increase the viscosity, whereas fluorine strongly decreases the viscosity of the sodium silicate melts even with the enhancing effect of the latter on the polymerization of silicate anions. The viscosity of silicate melts has been commonly related to the overall polymerization degree of the liquid. However, the viscosity of fluorine-containing silicates cannot be explained by this conventional scenario. Fluorine ions tend to loosely bond with sodium cations. These sodium-fluorine complexes played a strong lubricant role in the network liquids.
机译：氟和氮是冶金渣和助熔剂的重要元素。对其粘度的研究通常集中在氟化物和氮化物化合物（例如，CAF_2和Si_3N_4）的添加剂作用，而阴离子组合物（即氧气，氟和氮浓度）的影响仍不清楚。本研究报告了通过在受控气氛下通过旋转坩埚法通过旋转坩埚方法来报告由于简单的硅酸钠系统的阴离子组合物的变化而几乎定量的粘度变化。 〜（29）Si魔法角纺丝核磁共振（MAS NMR）光谱法用于表征淬火玻璃样品中不同氮和氟浓度的结构变化。局部硅结构的观察变化与硅酸盐玻璃中氮和氟的常规结构作用的预期变化一致：氮原子倾向于与硅原子粘合，而氟原子较倾向于周围的钠阳离子。此外，氮倾向于增加粘度，而氟强烈地降低硅酸钠熔体的粘度，即使是后者对硅酸盐阴离子聚合的增强效果。硅酸盐熔体的粘度通常与液体的整体聚合度有关。然而，通过这种传统场景不能解释含氟硅酸盐的粘度。氟离子倾向于松散地与钠阳离子结合。这些氟络合物在网络液体中发挥了强大的润滑剂作用。

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  • 来源
    《ISIJ international》 |2020年第12期|2794-2806|共13页
  • 作者

    Sohei SUKENAGA; Masayuki OGAWA; Yutaka YANABA; Mariko ANDO; Hiroyuki SHIBATA;

  • 作者单位

    Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials Tohoku University. Now at Glass Division Figured & Plate Glass Department AGC Yokohama Technical Center AGC Inc. 1-1 Suehiro-cho Tsurumi-ku Yokohama 230-0045 Japan;

    Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan;

    Graduate School of Engineering Tohoku University 6-6-04 Aramaki-aza-Aoba Aoba-ku Sendai 980-8579 Japan;

    Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    viscosity; silicate melts; glasses; Na-Si-O-N-F; ~(29)Si and ~(19)F MAS NMR spectroscopy;

    机译：粘度;硅酸盐熔化;眼镜;na-si-o-n-f;〜（29）Si和〜（19）F MAS NMR光谱;

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