METHODS AND SYSTEMS FOR CHEMICALLY STRENGTHENING LITHIUM-CONTAINING GLASS
First Claim
1. A method, comprising:
- contacting at least a portion of a glass-based substrate with a first salt bath comprising greater than or equal to 2 wt. % lithium nitrate and at least one of potassium nitrate and sodium nitrate to form an ion-exchanged glass-based substrate; and
contacting at least a portion of the ion-exchanged glass-based substrate with a second salt bath comprising at least one of potassium nitrate and sodium nitrate to form a glass-based article,wherein the glass-based substrate comprises lithium.
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Abstract
Methods and systems of strengthening lithium-containing glass-based substrates including contacting at least a portion of the lithium-containing glass-based substrates with a first salt bath comprising at least 2 wt. % lithium nitrate and at least one of potassium nitrate and sodium nitrate and contacting at least a portion of the lithium-containing glass-based substrates with a second salt bath comprising at least one of potassium nitrate and sodium nitrate. The methods further include that after contacting 3 m2 of glass per kilogram of molten salt (3 m2/kg salt) to 13 m2/kg salt for the first salt bath, a surface compressive stress imparted to the glass articles by the contacting steps decreases by less than 30 MPa.
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Citations
23 Claims
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1. A method, comprising:
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contacting at least a portion of a glass-based substrate with a first salt bath comprising greater than or equal to 2 wt. % lithium nitrate and at least one of potassium nitrate and sodium nitrate to form an ion-exchanged glass-based substrate; and contacting at least a portion of the ion-exchanged glass-based substrate with a second salt bath comprising at least one of potassium nitrate and sodium nitrate to form a glass-based article, wherein the glass-based substrate comprises lithium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A salt bath system, comprising:
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a first salt bath comprising at least one of potassium nitrate and sodium nitrate and greater than or equal to 2 wt. % lithium nitrate, wherein the first salt bath is maintained at a temperature from greater than or equal to 350°
C. to less than or equal to 520°
C.; anda second salt bath comprising at least one of potassium nitrate and sodium nitrate and less than or equal to 1 wt. % lithium nitrate, wherein the second salt bath is maintained at a temperature from greater than or equal to 350°
C. to less than or equal to 520°
C. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method, comprising:
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contacting a first batch of glass-based substrates with a first salt bath comprising greater than 2 wt. % lithium nitrate and at least one of potassium nitrate and sodium nitrate to form a first batch of ion-exchanged glass-based substrates, wherein the glass-based substrates comprises lithium, and lithium cations diffuse from the glass-based substrates into the first salt bath; contacting the first batch of the ion-exchanged glass-based substrates with a second salt bath comprising at least one of potassium nitrate and sodium nitrate to form glass-based articles, wherein lithium cations diffuse from the ion-exchanged glass-based substrates into the second salt bath; and wherein a surface compressive stress imparted to the glass-based articles by the contacting steps decreases by less than 30 MPa after contacting from greater than or equal to 3 m2 of glass-based substrates per kilogram of molten salt (m2/kg salt) to less than or equal to 13 m2/kg salt in the first salt bath.
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Specification