Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1976-11-22
1978-03-21
Bashore, S. Leon
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 30R, 65111, C03C 1500
Patent
active
040801888
ABSTRACT:
A porous layer is formed on a surface of a body of phase separable glass by heat treating the glass to cause it to become separated into at least two distinct phases of different solubility. A surface of the body is subjected to a leaching solution which preferentially leaches at least the most soluble phase, leaving a surface layer consisting of a skeletal structure that comprises the least soluble phase disposed on a substrate of phase separated glass. The glass body is then subjected to a second heat treatment at a sufficiently high temperature that the phase separated glass substrate is caused to become homogeneous, the porous surface layer remaining substantially unchanged. The resultant homogeneous glass substrate is more chemically durable than it was in the phase separated state.
REFERENCES:
patent: 2600525 (1952-06-01), Ford
patent: 3551228 (1970-12-01), Meth
patent: 3616098 (1971-10-01), Falls
patent: 3811852 (1974-05-01), Bondarev et al.
patent: 3938974 (1976-02-01), Macedo et al.
Doddato John A.
Minot Michael J.
Bashore S. Leon
Corning Glass Works
Miga Frank W.
Patty, Jr. Clarence R.
Simmons, Jr. William J.
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