Substrates for magnetic discs, magnetic discs and process for pr

Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate

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427555, 427444, 427301, 427299, 427275, 427129, 427131, G11B 584

Patent

active

060485892

ABSTRACT:
A magnetic disc substrate is provided, which includes a magnetic disc substrate body made of glass and is characterized in that a metal element capable of absorbing light in at least a surface portion of the magnetic disc substrate body, and a texture is formed on a surface of the magnetic disc substrate body. Ions of the metal element are dispersed in the surface portion of the magnetic disc substrate, or the metal element is contained in a composition of the glass constituting the magnetic disc substrate in the form of an oxide. The glass is preferably a crystallized glass a Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 based crystallized glass, which particularly preferably contains 65 to 85 wt % of SiO.sub.2, 8 to 15 wt % of Li.sub.2 O, 2 to 8 wt % of Al.sub.2 O.sub.3, 1 to 5 wt % of P.sub.2 O.sub.5 and 1 to 10 wt % of ZrO.sub.2 and has lithium disilicate (Li.sub.2 O.2SiO.sub.2) as a main crystalline phase.

REFERENCES:
patent: 5273834 (1993-12-01), Hoover et al.
patent: 5586040 (1996-12-01), Baumgart et al.
patent: 5595791 (1997-01-01), Baumgart et al.

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