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Hydration of silicate glasses in aqueous solutions
| Details |
Inventors: Bartholomew, Roger F.; Campbell, Larry E.; Lewek, Stanley S.; Pierson, Joseph E.; Stookey, Stanley D.;
Assignee: Corning Glass Works (Corning, NY)
Primary Examiner: Lindsay, Jr.; Robert L.
Assistant Examiner:
Attorney, Agent or Firm: Janes, Jr.; Clinton S., Patty, Jr.; Clarence R.
The present invention relates to a method for hydrating fine-dimensioned alkali metal-containing silicate glass bodies so as to impart the property of thermoplasticity thereto. More particularly, this invention contemplates contacting fine-dimensioned alkali metal silicate glass bodies with an aqueous solution at elevated temperatures and pressures to develop at least a surface layer thereon having a water content ranging up to about 36% by weight, said aqueous solution having a pH less than 6 as measured at room temperature. The hydrated bodies can approach certain properties of high-polymer organic plastics and exhibit the capability of being thermoplastically formed at relatively low temperatures. |
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DETAILED DESCRIPTION We claim: 1.
A method for making a hydrated glass body exhibiting thermoplastic properties which comprises contacting a fine-dimensioned anhydrous glass body consisting essentially, in mole percent on the oxide basis, of about 3-25% Na.
sub.
2 O and/or K.
sub.
2 O and 50-95% SiO.
sub.
2, the sum of those components constituting at least 55% of the total composition, with an aqueous solution environment having a pH less than 6, as measured at room temperature, this contact being made at a temperature in excess of 100.
degree.
C.
and at a pressure in excess of 20 psig for a period of time sufficient to hydrate at least a surface portion having an amount of H.
sub.
2 O absorbed therein effective to impart thermoplastic properties thereto.
2.
A method according to claim 1 wherein said temperature ranges up to about 374.
degree.
C.
3.
A method according to claim 1 wherein said temperature ranges between about 200.
degree.
-300.
degree.
C.
4.
A method according to claim 1 wherein said pressure ranges up to about 3200 psi.
5.
A method accordng to claim 1 wherein said aqueous solution is buffered to maintain the pH below 6 during the hydration process.
6.
A method according to claim 1 wherein said aqueous solution has a pH less than 5.
7.
A method according to claim 4 wherein said hydrated glass body exhibits greater chemical durability than the anhydrous glass body.
8.
A method according to claim 1 wherein said fine-dimensioned glass body has a thickness dimension no greater than about 5 mm.
9.
A method according to claim 1 wherein said aqueous solution contains an acid and/or a salt.
10.
A method according to claim 9 wherein said aqueous solution contains said acid and/or salt in an amount up to saturation.
11.
A method according to claim 1 wherein said amount of water absorbed ranges up to about 36%.
12.
A method according to claim 1 wherein said time ranges between about 2-48 hours.
13.
A method for forming shapes from the fine-dimensioned glass bodies made in accordance with claim 1 exhibiting thermoplastic properties which comprises the steps of: a
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