利用差热分析、热膨胀曲线与Ｘ射线衍射等方法研究了含ＴｉＯ２和ＺｒＯ２的 ＭｇＯ－Ａｌ２Ｏ３－ＳｉＯ２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．
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.
参考文献
| [1] | 迟玉山，沈菊云，陈学贤．陶瓷学报．2000， 21 (2): 115--120. [2] Maschio R D, Scardi P. Ceramics International， 1991, 17: 31--36. [3] Stewart D R. In: Hench L.L. and Freiman S.W. ed. Advances in Nucleation and Crystallization in Glasses (American, Columbus: The American Ceramic Society, Inc., 1971.): 83--90. [4] 杨南如. 无机非金属材料测试方法. 武汉：武汉工业大学出版社，1990. [5] Dusil J, Cervinka L. Glass Tech., 1976, 17 (3): 106--111. [6] Barry T I, Cox J M, Morrell R. J. Mater. Sci., 1978, 13: 594--610. [7] Holmouist S B. Z. Krist., 1963, 118: 477--478. [8] Zdaniewski W. J. Amer. Ceram. Soc., 1978, 61 (5-6): 199--204. [9] Zdaniewski W. J. Amer. Ceram. Soc., 1975, 58 (5-6): 163--169. [10] Neilson G F. In: Hench L. L. and Freiman S. W. ed. Advances in Nucleation and Crystallization in Glasses (American, Columbus: The American Ceramic Society, Inc., 1971.): 73--82. [10] Schulz H, Muchow G, Hoffmann W, et al. Z. Krist., 1971, 133: 91--109. |
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