Chemical strengthening process for disks used in disk drive...

Details Chemical strengthening process for disks used in disk drive... Chemical strengthening process for disks used in disk drive...

2007-04-03

2007-04-03

Mayes, Dionne W. (Department: 1731)

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

C065S030100, C427S431000, C427S430100

Reexamination Certificate

active

10116340

ABSTRACT:
A salt mixture used for chemical strengthening of data recording disks is subjected to sub-micron filtration prior to use to remove certain impurities. Preferably, glass disks are chemically strengthened by ion exchange in a bath of molten sodium nitrate and potassium nitrate. A salt fresh mixture is prepared by starting with high-grade bulk salt in the intended proportions, melting the salt, and filtering the salt in a stainless steel filter, which is preferably approximately 2 micron or smaller. Filtration removes trace amounts of certain contaminants. The salt mixture thus prepared is then used for chemical strengthening of disks in the conventional manner.

REFERENCES:
patent: 3879274 (1975-04-01), Matsumori et al.
patent: 6119483 (2000-09-01), Takahashi et al.
patent: 6534120 (2003-03-01), Ozawa et al.
patent: 61-178004 (1996-08-01), None

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