Inorganic composition article

Details Inorganic composition article Inorganic composition article

2008-04-02

2011-10-25

Xu, Ling (Department: 1784)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S446000, C428S702000, C428S432000, C501S004000

Reexamination Certificate

active

08043706

ABSTRACT:
An inorganic composition article used in disk substrate for information recording media, with a low melting point and a high productivity, combining superior surface characteristics capable of sufficiently dealing with a ramp load system for high density recording in both an in-plane magnetic recording system and a perpendicular magnetic recording system, having a high mechanical strength capable of enduring high speed rotation and impact, and combining both a heat expansion characteristic and heat resistance corresponding to each drive component. The inorganic composition articles contain a Li2O component and an Al2O3component, with the percent by mass ratio of Li2O to Al2O3(Li2O/Al2O3) being at least 0.3, include crystals, and have a compressive stress layer arranged on a surface.

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