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硬盘基板用微晶玻璃的析晶过程研究

迟玉山; 沈菊云; 陈学贤   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:2000-09-18 修回日期:2000-10-16 出版日期:2001-09-20 网络出版日期:2001-09-20

Crystallization Process of Glass-Ceramic for Substrate of Hard Disks

CHI Yu-Shan; SHEN Ju-Yun; CHEN Xue-Xian   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2000-09-18 Revised:2000-10-16 Published:2001-09-20 Online:2001-09-20

摘要: 利用差热分析、热膨胀曲线与X射线衍射等方法研究了含TiO和ZrO的 MgO-Al-SiO玻璃的析晶过程.780℃时玻璃中析出的镁铝钛酸盐促使玻璃在800℃析出Mg-透辉石,随后在 930℃Mg-透辉石和镁铝钛酸盐开始向假蓝宝石、金红石和Zr/Ti固溶体转变;1030℃假蓝宝石开始转变为β-石英固溶体,而在1125℃以上温度,β-石英固溶体转化为α-堇青石、方石英和顽火辉石,同时金红石和Zr/Ti固溶体向锆英石和钛酸镁转变.依据玻璃析晶序列,选择在930~1050℃间温度下对玻璃进行热处理,制得以假蓝宝石为主晶相的微晶玻璃.此微晶玻璃具有细小均匀的晶粒结构,具有高的弹性模量(120GPa)和良好的表面性能,是适宜的硬盘基板材料.

关键词: TiO2, ZrO2, MgO-Al2O3-SiO2微晶玻璃, DTA, 热膨胀曲线, XRD

Abstract: The crystallization process of MgO-Al2O3-SiO2 glass containing TiO2 and ZrO2 was studied by means of DTA, thermal expansion curve and XRD. Magnesium
aluminium titanate appearing at 780℃ promotes the crystallization ofMg-petalite at 800℃, and then those crystal phases transform to sapphirine,
rutile and Zr/Ti solid solution at 930℃. β-quartz solid solution appears at 1030℃ and transforms at temperature higher than 1125℃ to α-cordierite,
cristobalite and enstatite, while rutile and Zr/Ti solid solution transform to zircon and magnesium titanate. According to the crystallization process, a glass-ceramic with sapphirine
as the main phase can be prepared at the temperature between 930℃ and 1050℃. The glass-ceramic with a fine-grained structure has large elastic modulus (120GPa) and
good surface properties, and is an excellent material for substrate of hard disks.

Key words: TiO2, ZrO2, MgO-Al2O3-SiO2 glass-ceramic, DTA, thermal expansion curve, XRD

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