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US 9,802,857 B2Granted
Dimensionally stable fast etching glasses
AssigneeCorning Incorporated
InventorsBradley Frederick Bowden, Adam James Ellison, Timothy James Kiczenski
Life of this patent
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Abstract
Substantially alkali free glasses are disclosed with can be used to produce substrates for flat panel display devices, e.g., active-matrix liquid crystal displays (AMLCDs). The glasses have high annealing temperatures and etch rates. Methods for producing substantially alkali free glasses using a downdraw process (e.g., a fusion process) are also disclosed.
Claims12
A glass comprising in mole percent on an oxide basis:
- SiO2 60-80,
- Al2O3 5-20,
- B2O3 0-10,
- MgO 0-20,
- CaO 0-20,
- SrO 0-20,
- BaO 0-20,
- ZnO 0-20:
- wherein the glass's composition satisfies the following relationship in which Al2O3, B2O3, MgO, CaO, SrO, and BaO are in mole percent:
- −54.6147+(2.50004)*(Al2O3)+(1.3134)*(B2O3)+(1.84106)*(MgO)+(3.01223)*(CaO)+(3.7248)*(SrO)+(4.13149)*(BaO)≧23;
- and wherein the glass has the following properties:
- (i) an annealing temperature greater than or equal to 800° C.;
- (ii) a Young's modulus greater than or equal to 82 GPa;
- (iii) a T200P less than or equal to 1750° C.;
- (iv) a T350 less than or equal to 1340° C.;
- and
- (v) an average surface roughness as measured by atomic force microscopy of less than 0.5 nm.
14 more elements
Dependencies are inferred from the claim text.