Method of manufacturing a magnetic recording disk

Coating processes – Magnetic base or coating – Magnetic coating

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65 301, 65 601, C03C 1500, B05D 512

Patent

active

056816090

ABSTRACT:
A method for manufacturing a magnetic recording disk including the steps of forming a film of solution on at least a principal surface of a sheet glass; the solution contains a water soluble inorganic material and a surface active agent; sandwiching both sides of a single sheet glass on which the film is formed or on a laminated structure of plural sheet glasses with a densified sheet with a high flatness to pressure the single glass or laminated structure; and heating and annealing the single sheet glass or laminated structure to flatten it. The end side of the flattened glass substrate is treated with a treating solution containing hydrofluosilicic acid. The glass substrate is formed by chemically strengthening a glass substrate by immersing the glass substrate in a chemical reinforcement solution, heating, and ion exchanging ions on the surface of the glass substrate with ions in the chemical reinforcement solution; removing the substrate from the chemical reinforcement solution and annealing the substrate at a temperature higher than the crystallization temperature of the molten salt; annealing the glass substrate; and finally cleaning the substrate.

REFERENCES:
patent: 4786325 (1988-11-01), Melard et al.
patent: 5029317 (1991-07-01), Kawai et al.
patent: 5087482 (1992-02-01), Kawai et al.
patent: 5277946 (1994-01-01), Nagai et al.
patent: 5569518 (1996-10-01), Hayashi

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