无机材料学报 ›› 2012, Vol. 27 ›› Issue (4): 400-404.DOI: 10.3724/SP.J.1077.2012.00400 CSTR: 32189.14.SP.J.1077.2012.00400

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玻璃冷却速率对锂铝硅微晶玻璃晶化行为和结构的影响

董 伟1, 卢金山1, 冯志军1, 李要辉2   

  1. (1. 南昌航空大学 材料科学与工程学院, 南昌 330063; 2. 中国建筑材料科学研究总院 玻璃科学研究所, 北京 100024)
  • 收稿日期:2011-05-08 修回日期:2011-06-05 出版日期:2012-04-10 网络出版日期:2012-03-12
  • 作者简介:董 伟(1982-), 男, 硕士研究生.
  • 基金资助:
    航空科学基金(2007ZF56011) Aeronautical Science Foundation of China (2007ZF56011)

Effect of Glass Cooling Rate on the Crystallization Behavior and Structure of Lithium Aluminosilicate Glass-ceramics

DONG Wei1, LU Jin-Shan1, FENG Zhi-Jun1, LI Yao-Hui2   

  1. (1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China; 2. Glass Science Institute, China Building Materials Academy, Beijing 100024, China)
  • Received:2011-05-08 Revised:2011-06-05 Published:2012-04-10 Online:2012-03-12

摘要:

玻璃成型过程中冷却速率对Li2O-Al2O3-SiO2(LAS)微晶玻璃的晶化行为及其结构均匀性具有重要影响. 有限元分析表明, 10 mm厚玻璃冷却速率显著低于2 mm厚玻璃, 冷却15 s以上玻璃的中心温度仍高于700℃, 对应的基础玻璃极易出现“析晶结石”. 利用DTA、IR、SEM等技术分析不同厚度LAS玻璃及其微晶玻璃的显微结构, 8 mm厚的玻璃冷却速率低, 样品心部析出初始晶核, 并在热处理阶段形成β-锂辉石固溶体相, 而样品表面层却为β-石英固溶体相; 与此相反, 3 mm厚的玻璃冷却速率高, 没有初始晶核生成, 热处理后得到单一均匀的β-石英固溶体相. 因此, 提高玻璃冷却速率、控制玻璃温度均匀性是制备结构均匀LAS微晶玻璃的关键.

关键词: 锂铝硅微晶玻璃, 冷却速率, 有限元分析, 组织结构

Abstract:

The glass cooling rate during forming process has significant effect on the crystallization behavior and structural uniformity of Li2O-Al2O3-SiO2 (LAS) glass-ceramics. Finite element analysis indicated that the cooling rate of 10 mm thick glass was notably lower than that of 2 mm thick glass. The central temperature of LAS glass was still above 700℃ even after the sample was cooled for 15 s, which led to the formation of crystal stones in the parent glass. The microstructure of LAS glass and glass-ceramics with different thickness were analyzed using DTA, IR and SEM. Since the 8 mm thick glass cooled slowly, primary crystal nuclei were generated in the glass interior. After heat treatment, a b-spodumene phase was formed in the interior, while a b-quartz solid solution phase formed on the surface. On the contrary, primary crystal nuclei were not generated in the 3 mm thick glass due to its high cooling rate. A single and uniform b-quartz solid solution phase was found after heat treatment. Therefore, the high glass cooling rate and the temperature uniformity of glass are very important for the preparation of structurally uniform LAS glass-ceramics.

Key words: lithium aluminosilicate glass-ceramics, finite element analysis, cooling rate, structure

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