Described herein are aluminoborosilicate glass compositions that are substantially alkali-free and exhibit desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). The glass compositions can be formed int
Described herein are aluminoborosilicate glass compositions that are substantially alkali-free and exhibit desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). The glass compositions can be formed into glass sheets by, for example, the float process. When used as substrates, the glass sheets exhibit dimensional stability during processing and damage resistance during cutting.
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1. A substantially alkali-free glass comprising in mole percent on an oxide basis: SiO2: 65-70.3Al2O3: 11-14B2O3: 2-7.5MgO: 2-7.5CaO: 3-11SrO: 0-5.5BaO: 0-2ZnO: 0-2 wherein: (a) [SiO2]+[Al2O3]≦81.3;(b) Σ[RO]/[Al2O3]≦1.3;(c) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧775 where a0=847.516, a1=
1. A substantially alkali-free glass comprising in mole percent on an oxide basis: SiO2: 65-70.3Al2O3: 11-14B2O3: 2-7.5MgO: 2-7.5CaO: 3-11SrO: 0-5.5BaO: 0-2ZnO: 0-2 wherein: (a) [SiO2]+[Al2O3]≦81.3;(b) Σ[RO]/[Al2O3]≦1.3;(c) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧775 where a0=847.516, a1=4.747, a2=−10.144, a3=−5.089, a4=−6.837, and a5=−6.548; and (d) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≦1310 where a0=1710.446, a1=−7.715, a2=−14.847, a3=−17.550, a4=−16.643, and a5=−12.574; and where [SiO2], [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of SiO2, Al2O3, B2O3, MgO, CaO, and SrO, respectively, and Σ[RO] equals the sum of the mole percents of MgO, CaO, SrO, BaO, and ZnO. 2. The glass of claim 1 wherein the annealing point of the glass is greater than or equal to 740° C. when measured by a fiber elongation technique. 3. The glass of claim 1 wherein: a0+a1[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧685 where: (i) [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively; and(ii) a0=774.973, a1=4.886, a2=−9.666, a3=−3.610, a4=−5.840, and a5=−5.713. 4. The glass of claim 3 wherein the strain point of the glass is greater than or equal to 685° C. when measured by a fiber elongation technique. 5. The glass of claim 1 wherein: a0+a1[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧200 where: (i) [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively; and(ii) a0=387.802, a1=33.509, a2=52.734, a3=18.704, a4=−40.918, and a5=−77.347. 6. The glass of claim 5 wherein the indentation crack initiation threshold of the glass is greater than or equal to 200 grams force. 7. The glass of claim 1 wherein: 84≧a0+a1[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧68 where: (i) [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively; and(ii) a0=67.773, a1=0.865, a2=−0.825, a3=0.903, a4=0.356, and a5=0.133. 8. The glass of claim 7 wherein the Young's modulus E of the glass satisfies the relationship: 84 GPa≧E≧68 GPa. 9. The glass of claim 1 wherein: 38≧a0+a1[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧30 where: (i) [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively; and(ii) a0=18.773, a1=−0.365, a2=0.187, a3=0.744, a4=1.500, and a5=1.848. 10. The glass of claim 9 wherein the CTE of the glass over the range from 22° C. to 300° C. satisfies the relationship: 38×10−7/° C.≧CTE≧30×10−7/° C., where the CTE is measured by a fiber elongation technique. 11. The glass of claim 1 wherein: a0+a1[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≦2.56 where: (i) [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively; and(ii) a0=2.195, a1=0.009, a2=−0.005, a3=0.011, a4=0.013, and a5=0.027. 12. The glass of claim 11 wherein the density of the glass is less than or equal to 2.56 grams/cm3. 13. The glass of claim 1 wherein the poise temperature of the glass is less than or equal to 1330° C. 14. The glass of claim 1 wherein the glass satisfies at least two of the following relationships: (a) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧685 where:a0=774.973, a1=4.886, a2=−9.666, a3=−3.610, a4=−5.840, and a5=−5.713;(b) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧200 where:a0=387.802, a1=33.509, a2=52.734, a3=18.704, a4=−40.918, and a5=−77.347;(c) 84≧a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧68 where:a0=67.773, a1=0.865, a2=−0.825, a3=0.903, a4=0.356, and a5=0.133;(d) 38≧a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧30 where:a0=18.773, a1=−0.365, a2=0.187, a3=0.744, a4=1.500, and a5=1.848; and(e) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≦2.56 where:a0=2.195, a1=0.009, a2=−0.005, a3=0.011, a4=0.013, and a5=0.027. 15. The glass of claim 14 wherein the glass satisfies all of the relationships (a)-(e). 16. The glass of claim 1 wherein the glass has at least two of the following properties: (a) an annealing point of the glass is greater than or equal to 740° C. when measured by a fiber elongation technique;(b) a glass strain point greater than or equal to 685° C. when measured by a fiber elongation technique;(c) an indentation crack initiation threshold of the glass is greater than or equal to 200 grams force;(d) a Young's modulus E of the glass satisfies the relationship: 84 GPa≧E≧68 GPa;(e) a CTE of the glass over the range from 22° C. to 300° C. satisfies the relationship: 38×10−7/° C.≧CTE≧30×10−7/° C., where the CTE is measured by a fiber elongation technique;(f) a density of the glass is less than or equal to 2.56 grams/cm3; and(g) a poise temperature of less than or equal to 1330° C. 17. The glass of claim 16 wherein the glass has all of the properties (a)-(g). 18. The glass of claim 1 in the form of a plate produced by a float process. 19. A glass substrate for a flat panel display device comprising the glass of claim 1. 20. A flat panel display device comprising a flat, transparent glass substrate carrying polycrystalline silicon thin film transistors, wherein the glass substrate comprises the glass of claim 1. 21. A substantially alkali-free glass comprising in mole percent on an oxide basis: SiO2: 65-70.3Al2O3: 11-14B2O3: 2-7.5MgO: 2-7.5CaO: 3-11SrO: 0-5.5BaO: 0-2ZnO: 0-2 wherein: (a) [SiO2]+[Al2O3]≦81.3; and(b) Σ[RO]/[Al2O3]≦1.3;(c) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≧720 where a0=774.973, a1=4.886, a2=−9.666, a3=−3.610, a4=−5.840, and a5=−5.713; and (d) a0+a1*[Al2O3]+a2*[B2O3]+a3*[MgO]+a4*[CaO]+a5*[SrO]≦1310 where a0=1710.446, a1=−7.715, a2=−14.847, a3=−17.550, a4=−16.643, and a5=−12.574; and wherein [Al2O3], [B2O3], [MgO], [CaO], and [SrO] are the mole percents of Al2O3, B2O3, MgO, CaO, and SrO, respectively, and Σ[RO] equals the sum of the mole percents of MgO, CaO, SrO, BaO, and ZnO.
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