Crystallization Process of Glass-Ceramic for Substrate of Hard Disks

Abstract

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

CLC Number:

TQ171

CHI Yu-Shan,SHEN Ju-Yun,CHEN Xue-Xian. Crystallization Process of Glass-Ceramic for Substrate of Hard Disks[J]. Journal of Inorganic Materials.

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Crystallization Process of Glass-Ceramic for Substrate of Hard Disks

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