...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The effect of initial oxidation state on crystallization of basaltic glass
【24h】

The effect of initial oxidation state on crystallization of basaltic glass

机译：初始氧化态对玄武玻璃结晶的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Iron-rich silicates mined as basalt may be processed as glass fibers and, woven to textile mats, it may be used as heat insulation. High-temperature stability is however a limiting factor because at least three process of alteration occur upon heat treatment that affect mechanical and chemical properties, micron to nano-crystallization, oxidation and cation-enrichment at the glass surface with a few microns depth. We here evaluate the crystallization behavior of synthetic Fe3+-rich basalt (SB) heat treated in air (negligible oxygen potential) in comparison with previously studied Fe2+-rich natural basalt (NB) heat treated in air and in Ar (i.e., high and low oxygen potential, respectively). Initial crystals growing in Fe2+-rich basalt are micron-sized dendrites, and with temperature of heat treatment they become increasingly granular and are identified as pyroxene. Pyroxene in SB form smaller dendrites; crystallization textures and nucleation and growth rates, derived from crystal size distribution, are independent of the temperature of heat treatment in the range between 850 and 1030 degrees C. Here, the activation energy of pyroxene vanishes, though crystallization rates are smaller than those of NB. Whereas in NB pyroxene growth occurs diffusion limited, in SB it is likely to be limited by the attachment of ions to new crystal surface. (c) 2006 Elsevier B.V. All rights reserved.
机译：开采为玄武岩的富铁硅酸盐可加工成玻璃纤维，并编织到纺织垫上，可用作隔热材料。然而，高温稳定性是限制因素，因为热处理时至少发生三种改变过程，这些改变过程影响机械和化学性质，几微米深度的玻璃表面上的微米到纳米结晶，氧化和阳离子富集。与以前研究过的在空气和氩气中热处理过的富含Fe2 +的天然玄武岩（NB）相比，我们在这里评估了在空气中热处理过的富含Fe3 +的合成玄武岩（SB）的结晶行为（可忽略的氧势）氧势）。在富含Fe 2+的玄武岩中生长的初始晶体是微米级的树枝状晶体，并且随着热处理温度的升高，它们逐渐变得颗粒状并被鉴定为辉石。 SB中的辉石形成较小的树枝状;由晶体尺寸分布得出的结晶织构，成核速率和生长速率与850至1030摄氏度之间的热处理温度无关。此处，尽管结晶速率比NB的小，但辉石的活化能却消失了。在NB中，辉石的生长受到扩散的限制，而在SB中，它可能受到离子与新晶体表面的附着的限制。 （c）2006 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号