无机材料学报

• 研究论文 • 上一篇    下一篇

锂铝硅微晶玻璃中纤维状β-锂辉石晶相的形成和表征

胡安民1,2, 李明1, 毛大立1, 梁开明2   

  1. 1. 上海交通大学材料学院金属基复合材料国家重点实验室, 上海 200030; 2. 清华大学材料系, 北京 100084
  • 收稿日期:2004-11-22 修回日期:2005-01-11 出版日期:2006-01-20 网络出版日期:2006-01-20

Formation and Characterization of Whisker-like β-spodumene in LAS Glass-ceramics

HU An-Min1,2I Ming1 MAO Da-Li1 LIANG Kai-Ming2   

  1. 1. The State Key Laboratory of the Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China; 2. Tsinghua University,
    Beijing 100084, China
  • Received:2004-11-22 Revised:2005-01-11 Published:2006-01-20 Online:2006-01-20

摘要: 通过向Li2O-Al2O3-SiO2玻璃体系中加入一定量的MgF2, 获得了一种新的纤维状的β-锂辉石晶相,
初晶相为MgF2相, 随后直接析出β-锂辉石相, 完全抑制了亚稳定相β-石英固溶体的析出. 分相促进了细小和高度分散的MgF2颗粒的析出,
而MgF2的析出又为颗粒状β-锂辉石晶粒的非均匀形核提供了有效形核位置, 随温度的升高和时间的延长, 某些占据有效生长位置的颗粒状晶
粒择优长大, 得?到纤维状β-锂辉石. 在热处理条件为850℃/1h时, 抗弯强度达到最大值228MPa.

关键词: 微晶玻璃, 锂辉石, 强度, 相变

Abstract: A novel whisker-like β-spodumene glass-ceramics was obtained. Scanning electron microscope (SEM)
investigations demonstrated phase separation in the base glass and lead to the formation of a primary crystal phase of MgF2that promoted the
formation of spherical β-spodumene. The whisker-like spodumene crystals surrounded by spherical crystals, and the whisker-like crystals
grew at the expense of spherical crystals with increasing temperature and time. This means that formation mechanisms of whisker β-spodumene
would be: β-spodumene nucleated and formed as spherical crystals firstly, it grew to whisker form with increasing temperature and time
increased. The flexural strength of the glass ceramics reached the maximum 228MPa after heat treated at 850℃/1h.

Key words: glass-ceramics, spodumene, flexural strength, phase transition

中图分类号: