Edge strengthened substrate of a data storage disk and method fo

Details Edge strengthened substrate of a data storage disk and method fo Edge strengthened substrate of a data storage disk and method fo

1995-06-07

1998-03-31

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 653, 428410, 428426, 428913, 2704951, 270945, 369283, 369288, 65 3013, 65 3014, B32B 300

Patent

active

057336229

ABSTRACT:
An edge strengthened substrate of a data storage disk and a method for fabricating same is disclosed. A strengthening agent is preferably applied to selected portions of a disk-shaped glass substrate to increase the overall strength of the glass substrate. In one embodiment, a strengthening agent is preferably applied along an inner diameter portion of a disk-shaped glass substrate. A binder is preferably mixed with the strengthening agent to limit the mobility of the strengthening agent to the selected inner diameter portion of the substrate during the strengthening process. The glass substrate is then heated to a diffusion temperature for a sufficient duration of time to permit diffusion of the strengthening agent into the glass substrate. Selective application of a strengthening agent to an outer diameter portion of the glass substrate may be performed to further strengthen the glass substrate. Further application of a strengthening agent to an intermediate diameter surface portion of the glass substrate defined substantially between the inner and outer diameter portions may be performed to further increase the strength of the glass substrate.

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