Glass compositions with high modulus and wide CTE range for laminate structures

Abstract

The present invention provides a glass composition comprising from about 50 mol% to about 70 mol% of SiO2, from about 0.1 mol% to about 10 mol% of Al2O3, from about 5 mol% to about 25 mol% of B2O3, and from about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority under 35 USC §119 to U.S. Provisional Application Serial No. 62 / 927,543, filed on October 29, 2019, the contents of which are relied upon and incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to laminated glass structures for microelectronic carrier applications. More particularly, the present disclosure relates to glass laminates having high Young's modulus and tunable CTE. Background Art

[0004] Glass products are used in a variety of products and industries, including consumer and commercial devices. Glass products can be strengthened using a variety of methods, including chemical tempering, thermal tempering, ion exchange, and lamination. Laminated Mechanical glass strengthening enables glass devices to withstand repeated abuse from handling and use. Such glass devices are typically made by thermally bonding or laminating a glass core or center layer and one or two outer cladding or skin layers. The contrast between the thermal and mechanical properties of the core and cladding layers can affect compressive strength and crack formation or propagation in cladding glass laminates.

[0005] Therefore, there is a need for alternative glass materials for laminated glass structures and methods of making the same. Summary of the invention

[0006] According to a first aspect, the glass composition comprises about 50 mol% to about 70 mol% SiO2, about 0.1 mol% to about 10 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO. In certain embodiments, the ratio of the mole % of Al2O3 and B2O3 to the modifier is about 0.95 to about 1.05.

[0007] In certain embodiments, the glass composition has a Young's modulus of at least 79 GPa. In certain embodiments, the glass composition has a Young's modulus of less than 100 GPa. In certain embodiments, the glass composition has a thermal expansion coefficient of 8.0 ppm / °C to 10.0 ppm / °C. In certain embodiments, the modifier comprises Na2O and CaO. In certain embodiments, the modifier comprises Na2O, K2O, and CaO. In certain embodiments, the modifier converts the boron in B2O3 from a trigonal configuration to a tetrahedral configuration. In certain embodiments, the glass composition further comprises about 0 mol % to about 3 mol % of one or more of Y2O3, La2O3, ZrO2, TiO2, BeO, or Ta2O5.

[0008] According to a second aspect, a glass article includes a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass composition of the glass core layer comprises about 50 mol% to about 70 mol% SiO2, about 0.1 mol% to about 10 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO. In certain embodiments of the glass article of the second aspect, the ratio of the mole % of Al2O3 and B2O3 to the mole % of the modifier is about 0.95 to about 1.05.

[0009] In certain embodiments of the glass article of the second aspect, the glass composition has a Young's modulus of at least 79 GPa. In certain embodiments of the glass article of the second aspect, the glass composition has a Young's modulus of less than 100 GPa. In certain embodiments of the glass article of the second aspect, the glass composition has a thermal expansion coefficient of 8.0 ppm / °C to 10.0 ppm / °C. In certain embodiments of the glass article of the second aspect, the modifier comprises Na2O and CaO. In certain embodiments of the glass article of the second aspect, the modifier comprises Na2O, K2O and CaO. In certain embodiments of the glass article of the second aspect, the modifier converts boron in B2O3 from a trigonal configuration to a tetrahedral configuration. In certain embodiments of the glass article of the second aspect, the glass composition further comprises about 0 mol % to about 3 mol % of one or more of Y2O3, La2O3, ZrO2, TiO2, BeO or Ta2O5.

[0010] According to a third aspect, a glass article includes a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass core layer includes a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) between 8.0 ppm / °C and 10.0 ppm / °C. The first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) glass composition between 3.5 ppm / °C and 5.5 ppm / °C.

[0011] In certain embodiments of the glass article of the third aspect, the glass article has a coefficient of thermal expansion (CTE) between 3.5 ppm / °C and 10.0 ppm / °C. 制品 In certain embodiments of the glass article of the third aspect, the glass article has a coefficient of thermal expansion (CTE) between 4 ppm / °C and 9.5 ppm / °C. 制品In certain embodiments of the glass article of the third aspect, the glass article has a Young's modulus (Y 制品 ).

[0012] In certain embodiments of the glass article of the third aspect, the glass composition of the glass core layer comprises about 50 mol% to about 70 mol% SiO2, about 0.1 mol% to about 10 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, KO, and CaO. In certain embodiments of the glass article of the third aspect, the glass composition of the first glass cladding layer and the second glass cladding layer comprises about 40 mol% to about 65 mol% SiO2, about 0.1 mol% to about 20 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 5 mol% to about 40 mol% of a modifier, wherein the modifier is at least one of MgO and CaO.

[0013] In certain embodiments of the glass article of the third aspect, the glass core layer has an average core thermal expansion coefficient (CTE 平均芯 ), and the first glass cladding layer and the second glass cladding layer have a coefficient of thermal expansion (CTE) less than the average core 平均芯 ) of the average coating thermal expansion coefficient (CTE 平均包覆 ).

[0014] According to a fourth aspect, a method for forming a glass composition includes melting a batch material and forming a precursor glass, wherein the precursor glass comprises about 50 mol % to about 70 mol % SiO2, about 0.1 mol % to about 10 mol % Al2O3, about 5 mol % to about 25 mol % B2O3 and about 10 mol % to about 30 mol % of a modifier, wherein the modifier is at least one of Na2O, K2O and CaO.

[0015] According to a fifth aspect, a method for forming a laminated glass article includes contacting a molten core glass composition with a molten cladding glass composition to form a laminated glass article comprising a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass core layer comprises a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) between 8.0 ppm / °C and 10.0 ppm / °C. The first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) glass composition between 3.5 ppm / °C and 5.5 ppm / °C.

[0016] According to a sixth aspect, the device comprises about 50 mol% to about 70 mol% SiO2, about 0.1 mol% to about 10 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO. In certain embodiments of the device of the sixth aspect, the ratio of the mole % of Al2O3 and B2O3 to the modifier is about 0.95 to about 1.05.

[0017] In certain embodiments of the device of the sixth aspect, the glass composition has a Young's modulus of at least 79 GPa. In certain embodiments of the device of the sixth aspect, the glass composition has a Young's modulus of less than 100 GPa. In certain embodiments of the device of the sixth aspect, the glass composition has a thermal expansion coefficient of 8.0 ppm / °C to 10.0 ppm / °C. In certain embodiments of the device of the sixth aspect, the modifier comprises Na2O and CaO. In certain embodiments of the device of the sixth aspect, the modifier comprises Na2O, K2O and CaO. In certain embodiments of the device of the sixth aspect, the modifier converts boron in B2O3 from a trigonal configuration to a tetrahedral configuration. In certain embodiments of the device of the sixth aspect, the glass composition further comprises about 0 mol% to about 3 mol% of one or more of Y2O3, La2O3, ZrO2, TiO2, BeO or Ta2O5. In certain embodiments of the device of the sixth aspect, the device is an electronic device, an automotive device, a building device or an electrical device.

[0018] According to a seventh aspect, the device includes a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass core layer includes a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) between 8.0 ppm / °C and 10.0 ppm / °C. The first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) glass composition between 3.5 ppm / °C and 5.5 ppm / °C.

[0019] In certain embodiments of the device of the seventh aspect, the device has a coefficient of thermal expansion between 3.5 ppm / °C and 10.0 ppm / °C. In certain embodiments of the device of the seventh aspect, the device has a coefficient of thermal expansion between 4 ppm / °C and 9.5 ppm / °C. In certain embodiments of the device of the seventh aspect, the device has a Young's modulus between 80 GPa and 100 GPa.

[0020] In certain embodiments of the device of the seventh aspect, the glass composition of the glass core layer comprises about 50 mol% to about 70 mol% SiO2, about 0.1 mol% to about 10 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 10 mol% to about 30 mol% of a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO. In certain embodiments of the device of the seventh aspect, the glass composition of the first glass cladding layer and the second glass cladding layer comprises about 40 mol% to about 65 mol% SiO2, about 0.1 mol% to about 20 mol% Al2O3, about 5 mol% to about 25 mol% B2O3, and about 5 mol% to about 40 mol% of a modifier, wherein the modifier is at least one of MgO and CaO.

[0021] In certain embodiments of the device of the seventh aspect, the glass core layer has an average core thermal expansion coefficient (CTE 平均芯 ), and the first glass cladding layer and the second glass cladding layer have a coefficient of thermal expansion (CTE) less than the average core 平均芯 ) of the average coating thermal expansion coefficient (CTE 平均包覆 ). In certain embodiments of the device of the seventh aspect, the device is an electronic device, an automotive device, a building device, or an electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages of the subject matter will become apparent from the description, drawings, and claims.

[0023] Figure 1 is a schematic cross-sectional view of a glass article according to one or more embodiments shown and described herein.

[0024] Like reference numbers and numerals in the various drawings represent like elements. DETAILED DESCRIPTION

[0025] Now will be described in detail various embodiments shown in the accompanying drawings. Whenever possible, the same reference numerals are used throughout the drawings to represent the same or similar components. The components in the drawings are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the exemplary embodiments.

[0026] In the microelectronics industry, different manufacturers have somewhat uniform overarching requirements (i.e., size, shape, etc.) for carrier substrates. However, performance specifications (i.e., coefficient of thermal expansion, modulus of elasticity, etc.) may vary between different manufacturers or even between different facilities. The wide array of performance specifications for glass substrates in the microelectronics industry presents unique challenges to glass substrate manufacturers seeking to economically and efficiently mass produce such substrates that are compatible with different microelectronic carrier operations.

[0027] The compositions and methods described herein facilitate forming glass substrates that are compatible with processes employed by various microelectronic device manufacturers while allowing various properties such as CTE and Young's modulus to be adjusted to meet the specifications of various manufacturers. Specifically, some embodiments described herein relate to glass compositions, articles formed from the glass compositions, and methods for making glass articles having high Young's modulus and a large CTE range.

[0028] Laminated glass products

[0029] In various embodiments, the laminated glass article comprises a core layer and at least one cladding layer (or cladding) adjacent to the core layer. The core layer and the cladding layer are glass layers comprising glass compositions having different properties. The inventors have found that the effective CTE of the glass composition varies with the ratio of the mole % of Al2O3 and B2O3 to the modifier, and therefore, adjusting the ratio can be an effective driver for changing the CTE of the resulting glass laminate, which will be described in more detail below. The concept of adjustable CTE via the laminate is attractive because the thickness of the core layer and the cladding layer can be changed to span the entire range of CTE according to the needs of the microelectronic carrier application. An alternative method is to make a single monolithic glass for each required CTE, which is an expensive method requiring numerous glass compositions. The glass composition described herein can be used in a lamination process to provide an adjustable CTE and has a high modulus that provides a higher stiffness carrier. The CTE mismatch between the core layer and the cladding layer also results in a reinforcement effect, which will reduce carrier fracture during processing.

[0030] refer to Figure 1, schematically depicts a cross-section of a portion of a glass article 100 formed from a glass composition having a high Young's modulus and a desired CTE as described herein, as an example. The illustrated portion of the glass article 100 has a glass core layer 102 coupled to a first or upper glass cladding layer 104 and a second or lower glass cladding layer 106. In various embodiments, the glass article includes a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass article 100 includes a plurality of glass layers and can be considered a glass laminate. In some embodiments, the layers 102, 104, 106 are fused together without any adhesive, polymer layer, coating layer, etc. between them. In other embodiments, the layers 102, 104, 106 are coupled (e.g., adhered) together using an adhesive, etc. The glass core layer 102 has a glass core layer first surface 110 and a glass core layer second surface 112 that separate the thickness T1 of the glass core layer 102. First glass cladding layer 104 has first glass cladding layer first surface 120 and first glass cladding layer second surface 122 separated by thickness T2 of first glass cladding layer 104. Second glass cladding layer 106 has second glass cladding layer first surface 130 and second glass cladding layer second surface 132 separated by thickness T3 of second glass cladding layer 106.

[0031] The glass composition may be selected based on its CTE at a particular temperature or its average CTE over a temperature range (e.g., 0° C. to 400° C., 0° C. to 300° C., 0° C. to 260° C., 20° C. to 300° C., or 20° C. to 260° C.), its density, its Young's modulus, or other properties that may be desired for processing or use of the glass article 100. Suitably, the glass core layer 102 has a CTE between 8.0 and 10.0 ppm / ° C. and a Young's modulus between 79 GPa and 100 GPa, and the glass cladding layers 104, 106 have a CTE between 3.5 and 5.5 ppm / ° C. and a Young's modulus between 79 GPa and 100 GPa, such as those described herein for the glass core composition and the glass cladding composition.

[0032] In some embodiments, the glass article 100 is configured such that at least one of the glass cladding layers 104, 106 and the glass core layer 102 have different physical dimensions and / or physical properties, which allows for the selective removal of the at least one glass cladding layer 104, 106 relative to the glass core layer 102 to form a dimensionally precise cavity (not shown) that can be sized and shaped to receive a microelectronic component.

[0033] In various embodiments, the glass article 100 is configured such that at least one of the glass cladding layers 104, 106 and the glass core layer 102 have different coefficients of thermal expansion (CTE). According to various embodiments described herein, at least one of the glass cladding layers 104, 106 is formed from a glass cladding composition and has a CTE less than the average core thermal expansion coefficient. 平均芯 Average coating thermal expansion coefficient CTE 平均包覆 In such an embodiment, a nearly uniform compressive stress is developed through the thickness of the glass cladding layers 104, 106, and a balanced tensile stress is developed within the glass core layer 102. Such a glass laminate is mechanically strengthened and can withstand damage, such as that which may occur during handling, better than an unstrengthened glass article, as will be described in more detail below.

[0034] In various embodiments, the glass core layer 102 has a Young's modulus (Y 芯 ), which can minimize flexing of the glass during processing and prevent damage to devices attached to the glass, such as when the glass is used as a carrier substrate for electronic devices. In some embodiments, the glass core layer 102 has a Young's modulus greater than 79 GPa, greater than 85 GPa, greater than 90 GPa, greater than 95 GPa, or greater than 99 GPa. In some embodiments, the glass core layer 102 has a Young's modulus less than 100 GPa, less than 95 GPa, less than 90 GPa, less than 85 GPa, or less than 80 GPa. In some specific embodiments, the glass core layer 102 has a Young's modulus of about 79 GPa to about 100 GPa, such as about 80 GPa to about 100 GPa, about 80 GPa to about 95 GPa, about 80 GPa to about 90 GPa, about 80 GPa to about 85 GPa, about 85 GPa to about 100 GPa, about 85 GPa to about 95 GPa, about 85 GPa to about 90 GPa, about 90 GPa to about 100 GPa, about 90 GPa to about 95 GPa, about 95 GPa to about 100 GPa, or any range including and / or between any two of these values. However, it is contemplated that the desired properties, including Young's modulus, may vary depending on the specific embodiment, end use, and processing requirements of the glass core layer 102.

[0035] In various embodiments, the glass core layer 102 has a coefficient of thermal expansion (CTE) between 8.0 ppm / °C and 10.0 ppm / °C. 芯 ). In some embodiments, CTE 芯It is about 8.0 ppm / ℃ to about 10.0 ppm / ℃, such as about 8.0 ppm / ℃ to about 9.5 ppm / ℃, about 8.0 ppm / ℃ to about 9.0 ppm / ℃, about 8.0 ppm / ℃ to about 8.5 ppm / ℃, about 8.5 ppm / ℃ to about 10.0 ppm / ℃, about 8.5 ppm / ℃ to about 9.5 ppm / ℃, about 8.5 ppm / ℃ to about 9.0 ppm / ℃, about 9.0 ppm / ℃ to about 10.0 ppm / ℃, about 9.0 ppm / ℃ to about 9.5 ppm / ℃, about 9.5 ppm / ℃ to about 10.0 ppm / ℃, or any range including any two of these values ​​and / or between any two of these values.

[0036] In various embodiments, the glass cladding layers 104, 106 have a Young's modulus (Y 包覆 ), which can minimize flexing of the glass during processing and prevent damage to devices attached to the glass, such as when the glass is used as a carrier substrate for electronic devices. In some embodiments, the glass cladding layers 104, 106 have a Young's modulus greater than 79 GPa, greater than 85 GPa, greater than 90 GPa, greater than 95 GPa, or greater than 99 GPa. In some embodiments, the glass cladding layers 104, 106 have a Young's modulus less than 100 GPa, less than 95 GPa, less than 90 GPa, less than 85 GPa, or less than 80 GPa. In some specific embodiments, the Young's modulus of the glass cladding layers 104, 106 is from about 79 GPa to about 100 GPa, such as from about 80 GPa to about 100 GPa, from about 80 GPa to about 95 GPa, from about 80 GPa to about 90 GPa, from about 80 GPa to about 85 GPa, from 85 GPa to about 100 GPa, from about 85 GPa to about 95 GPa, from about 85 GPa to about 90 GPa, from about 90 GPa to about 100 GPa, from about 90 GPa to about 95 GPa, from about 95 GPa to about 100 GPa, or any range including and / or between any two of these values. However, it is contemplated that the desired properties, including Young's modulus, may vary depending on the specific embodiment, end use, and processing requirements of the glass cladding layers 104, 106.

[0037] In various embodiments, the coefficient of thermal expansion (CTE) of the glass cladding layers 104, 106 is 包覆 ) is between 3.5 ppm / °C and 5.5 ppm / °C. In some embodiments, CTE 芯It is about 3.5ppm / ℃ to about 5.5ppm / ℃, such as about 3.5ppm / ℃ to about 5.0ppm / ℃, about 3.5ppm / ℃ to about 4.5ppm / ℃, about 3.5ppm / ℃ to about 4.0ppm / ℃, about 4.0ppm / ℃ to about 5.5ppm / ℃, about 4.0ppm / ℃ to about 5.0ppm / ℃, about 4.0ppm / ℃ to about 4.5ppm / ℃, about 4.5ppm / ℃ to about 5.5ppm / ℃, about 4.5ppm / ℃ to about 5.0ppm / ℃, about 5.0ppm / ℃ to about 5.5ppm / ℃, or any range including any two of these values ​​and / or between any two of these values.

[0038] In various embodiments, the thickness of the layers 102, 104, 106 in the glass article 100 can vary widely. For example, the layers 102, 104, 106 can all have the same thickness or different thicknesses, or two layers can have the same thickness while the third layer has a different thickness.

[0039] In some embodiments, one or both of the glass cladding layers 104, 106 are each 5 microns to 300 microns thick, 10 microns to 275 microns thick, or 12 microns to 250 microns thick. In other embodiments, one or both of the glass cladding layers 104, 106 are each greater than 5 microns thick, greater than 10 microns thick, greater than 12 microns thick, greater than 15 microns thick, greater than 20 microns thick, greater than 25 microns thick, greater than 30 microns thick, greater than 40 microns thick, greater than 50 microns thick, greater than 60 microns thick, greater than 70 microns thick, greater than 80 microns thick, greater than 90 microns thick, greater than 100 microns thick, greater than 125 microns thick, greater than 150 microns thick, greater than 175 microns thick, or greater than 200 microns thick. In other embodiments, one or both of the glass cladding layers 104, 106 are each less than 300 microns thick, less than 275 microns thick, less than 250 microns thick, less than 225 microns thick, less than 200 microns thick, less than 175 microns thick, less than 150 microns thick, less than 125 microns thick, or less than 100 microns thick. However, it should be understood that the glass cladding layers 104, 106 can have other thicknesses.

[0040] In some embodiments, the glass core layer 102 has a thickness of 300 microns to 1200 microns or 600 microns to 1100 microns. In other embodiments, the glass core layer 102 has a thickness of greater than 300 microns, greater than 500 microns, greater than 600 microns, greater than 700 microns, greater than 800 microns, greater than 900 microns. In other embodiments, the glass core layer 102 has a thickness of less than 1200 microns, less than 1100 microns, less than 1000 microns, less than 900 microns, or less than 800 microns. However, it should be understood that the glass core layer 102 can have other thicknesses.

[0041] In various embodiments, the ratio of the thickness of the glass core layer (T1) to the total thickness of the glass cladding layers (the sum of T2 and T3) is greater than 1 and less than 50, or greater than 1.75 and less than 10. In some embodiments, the ratio is greater than 1, greater than 2, greater than 2.5, greater than 3, greater than 4, or greater than 5. In embodiments, the ratio is less than 50, less than 20, less than 10, less than 9, less than 8, less than 7, less than 6, less than 5, or less than 4. However, it should be understood that the glass substrate can have another ratio of the thickness of the glass core layer to the total thickness of the glass cladding layers.

[0042] In various embodiments, the glass article 100 has a coefficient of thermal expansion (CTE) between 3.5 ppm / °C and 10.0 ppm / °C. 制品 ). In some embodiments, CTE 制品 The invention can be from about 3.5 ppm / °C to about 10.0 ppm / °C, such as from about 3.5 ppm / °C to about 9.5 ppm / °C, from about 3.5 ppm / °C to about 8.0 ppm / °C, from about 3.5 ppm / °C to about 6.0 ppm / °C, from about 3.5 ppm / °C to about 4.0 ppm / °C, from about 4.0 ppm / °C to about 10.0 ppm / °C, from about 4.0 ppm / °C to about 9.5 ppm / °C, from about 4.0 ppm / °C to about 8.0 ppm / °C, from about 4.0 ppm / °C to about 6.0 ppm / °C. pm / ℃ to about 6.0ppm / ℃, about 6.0ppm / ℃ to about 10.0ppm / ℃, about 6.0ppm / ℃ to about 9.5ppm / ℃, about 6.0ppm / ℃ to about 8.0ppm / ℃, about 8.0ppm / ℃ to about 10.0ppm / ℃, about 8.0ppm / ℃ to about 9.5ppm / ℃, about 8.0ppm / ℃ to about 9.5ppm / ℃, or any range including any two of these values ​​and / or between any two of these values.

[0043] In various embodiments, the glass article 100 has a Young's modulus (Y 制品), which can minimize flexing of the glass during processing and prevent damage to devices attached to the glass, such as when the glass is used as a carrier substrate for electronic devices. In some embodiments, the glass article 100 has a Young's modulus greater than 79 GPa, greater than 85 GPa, greater than 90 GPa, greater than 95 GPa, or greater than 99 GPa. In some embodiments, the glass article 100 has a Young's modulus less than 100 GPa, less than 95 GPa, less than 90 GPa, less than 85 GPa, or less than 80 GPa. In some specific embodiments, the glass article 100 has a Young's modulus of about 79 GPa to about 100 GPa, such as about 80 GPa to about 100 GPa, about 80 GPa to about 95 GPa, about 80 GPa to about 90 GPa, about 80 GPa to about 85 GPa, about 85 GPa to about 100 GPa, about 85 GPa to about 95 GPa, about 85 GPa to about 90 GPa, about 90 GPa to about 100 GPa, about 90 GPa to about 95 GPa, about 95 GPa to about 100 GPa, or any range including and / or between any two of these values. However, it is contemplated that the desired properties, including Young's modulus, may vary depending on the specific embodiment, end use, and processing requirements of the glass article 100.

[0044] Another feature of the glass article 100 that can vary widely is the glass composition of the layers 102, 104, 106. For example, the layers 102, 104, 106 can all have different glass compositions, or two layers can have the same glass composition while the third layer has a different glass composition. Typically, one or both of the glass cladding layers 104, 106 have a different glass composition than the glass composition of the glass core layer 102, as described in detail below.

[0045] Core layer composition

[0046] The core glass compositions of the present technology have both high Young's modulus and high coefficient of thermal expansion. Generally, it is difficult to obtain both high CTE and high Young's modulus simultaneously because the most common way to achieve either property is by using different modifier ions with different cation field strengths. The cation field strength F is defined using the following equation:

[0047] F=Z c / (r c +r o ) 2

[0048] Where Z c is the charge on the cation, r c is the radius of the cation, and r ois the radius of the oxygen anion. The cation field strengths of the modifiers are, from lowest to highest, K, Na, Li, Ba, Sr, Ca, Mg. In order to obtain a high CTE, a general approach is to use a low field strength modifier such as K. In order to obtain a high Young's modulus, a general approach is to use a high field strength modifier such as Ca or Mg. However, this general approach to glass design is not applicable for simultaneously obtaining a high Young's modulus and a high CTE, because typically Young's modulus and CTE are properties that do not change in the same direction with composition changes.

[0049] The inventors of the present technology have discovered that starting from non-exotic and relatively inexpensive glass components including SiO2, Al2O3, B2O3, Na2O and CaO and using a novel method of changing the coordination of boron to tetrahedral rather than simply using high field strength modifiers to achieve high Young's modulus, a unique glass composition with both high CTE and high Young's modulus can be obtained. However, the core composition of the present technology achieves both high Young's modulus (e.g., greater than about 80 GPa) and high CTE values ​​(e.g., greater than about 8.0 ppm / °C).

[0050] The glass composition for the core layer (core glass) may include a base composition that is primarily aluminoborosilicate. Therefore, the base composition of the core layer glass may generally include a combination of SiO2, Al2O3, and B2O3. The core glass composition may also include at least one alkaline earth metal oxide such as CaO. The core glass composition may include at least one alkali metal oxide, such as Na2O and K2O. In some embodiments, the core glass composition may also include one or more additional oxides, such as but not limited to Y2O3, La2O3, ZrO2, TiO2, BeO, or Ta2O5. The core glass composition may generally include a combination of SiO2, Al2O3, B2O3, and a modifier, wherein the modifier is at least one of Na2O, K2O, and CaO. The modifier may include alkali metal oxides such as Na2O and K2O, or alkaline earth metal oxides such as CaO. The glass composition described in this section may be used to form the glass core layer 102 described in further detail herein.

[0051] In various embodiments, the core glass composition generally includes SiO2 in an amount of about 50 mol% to about 70 mol%. When the content of SiO2 is too small, the glass may have poor chemical and mechanical durability. On the other hand, when the content of SiO2 is too large, the melting ability of the glass is reduced and the viscosity is increased, so the formation of the glass becomes difficult. In some embodiments, SiO2 is present in the core glass composition in an amount of about 50 mol% to about 70 mol%, such as about 50 mol% to about 65 mol%, about 50 mol% to about 60 mol%, about 50 mol% to about 55 mol%, about 55 mol% to about 70 mol%, about 55 mol% to about 65 mol%, about 55 mol% to about 60 mol%, about 60 mol% to about 70 mol%, about 60 mol% to about 65 mol%, or about 65 mol% to about 70 mol%, or any two of these values ​​and / or any range between any two of these values. For example, SiO2 is present in the core glass composition in an amount of about 55 mol% to about 60 mol%, or about 55 mol% to about 65 mol%.

[0052] The core glass composition may also include Al2O3. Al2O3, in combination with alkali metal oxides such as Na2O, K2O, etc. present in the glass composition, increases the sensitivity of the glass to ion exchange strengthening. In addition, an increased amount of Al2O3 may also increase the softening point of the glass, thereby reducing the formability of the glass. The core glass composition described herein may include Al2O3 in an amount of about 0.1 mol% to about 10 mol%, such as about 0.1 mol% to about 8 mol%, about 0.1 mol% to about 6 mol%, about 0.1 mol% to about 4 mol%, about 0.1 mol% to about 2 mol%, about 2 mol% to about 10 mol%, about 2 mol% to about 8 mol%, about 2 mol% to about 6 mol%, about 2 mol% to about 4 mol%, about 4 mol% to about 10 mol%, about 4 mol% to about 8 mol%, about 4 mol% to about 6 mol%, about 6 mol% to about 10 mol%, about 6 mol% to about 8 mol%, about 8 mol% to about 10 mol%, or any range including any two of these values ​​and / or between any two of these values. For example, Al2O3 is present in the core glass composition in an amount of about 0.1 mol% to about 4 mol%.

[0053] In some embodiments described herein, the boron concentration in the core glass composition is a flux that can be added to the glass composition to make the viscosity-temperature curve less steep and to lower the overall curve to improve the formability of the glass and soften the glass. In various embodiments, the core glass composition includes about 5 mol % B2O3 to about 25 mol % B2O3, such as about 5 mol % B2O3 to about 20 mol % B2O3, about 5 mol % B2O3 to about 15 mol % B2O3, about 5 mol % B2O3 to about 10 mol % B2O3, about 10 mol % B2O3 to about 25 mol % B2O3, about 10 mol % B2O3 to about 20 mol % B2O3, about 10 mol % B2O3 to about 15 mol % B2O3, about 15 mol % B2O3 to about 25 mol % B2O3, about 15 mol % B2O3 to about 20 mol % B2O3, about 20 mol % B2O3 to about 25 mol % B2O3, or any range including and / or between any two of these values. For example, B2O3 is present in the core glass composition in an amount of about 15 mol% to about 20 mol%.

[0054] In various embodiments, the core glass composition generally includes a modifier. The modifier is at least one of Na2O, K2O, and CaO. When the modifier is added to the glass, the modifier is preferentially replaced by Al in the charge compensation effect. 3+ ions are consumed, so they act as Al 4+ ions and directly replace them with Si 4+ The excess modifier relative to Al ions can compensate for the charge B 3+ , so it acts as B 4+. The modifier changes the coordination of boron from triangular to tetrahedral. Triangular boron units reduce the Young's modulus of the glass, while higher coordinated tetrahedral units increase the modulus of the glass. In various embodiments, the modifier comprises Na2O and CaO. Thus, the modifier used in the glass compositions described herein affects the configuration of boron and thus affects various properties of the glass compositions, such as Young's modulus. In various embodiments, the modifier comprises Na2O, KO, and CaO. In various embodiments, the core glass composition comprises about 10 mol% to about 30 mol% of the modifier, such as 10 mol% to about 25 mol% of the modifier, 10 mol% to about 20 mol% of the modifier, 10 mol% to about 15 mol% of the modifier, 15 mol% to about 30 mol% of the modifier, 15 mol% to about 25 mol% of the modifier, 15 mol% to about 20 mol% of the modifier, 20 mol% to about 30 mol% of the modifier, 20 mol% to about 25 mol% of the modifier, 25 mol% to about 30 mol% of the modifier, or any range including any two of these values ​​and / or between any two of these values. For example, Na2O is present in the core glass composition in an amount of about 13 mol% to about 23 mol% or about 5 mol% to about 13 mol%. For example, CaO is present in the core glass composition in an amount of about 0 mol % to about 10 mol % or about 5 mol % to about 13 mol %. For example, K2O is present in the core glass composition in an amount of about 0.1 mol % to about 4 mol %.

[0055] The core glass composition is such that 0.95 < (Al2O3 + B2O3) / (NaO + CaO) < 1.05. In various embodiments, the ratio of the mole % of Al2O3 and B2O3 to the modifier is from about 0.95 to about 1.05, such as from about 0.95 to about 1.03, from about 0.95 to about 1, from about 0.95 to about 0.97, from about 0.97 to about 1.05, from about 0.97 to about 1.03, from about 0.97 to about 1, from about 1 to about 1.05, from about 1 to about 1.03, from about 1.03 to about 1.05, or any range including any two of these values ​​and / or between any two of these values.

[0056] In various embodiments, the ratio of the mole % of Al2O3 and B2O3 to Na2O and CaO is about 0.95 to about 1.05, such as about 0.95 to about 1.03, about 0.95 to about 1, about 0.95 to about 0.97, about 0.97 to about 1.05, about 0.97 to about 1.03, about 0.97 to about 1, about 1 to about 1.05, about 1 to about 1.03, about 1.03 to about 1.05, or any range including and / or between any two of these values.

[0057] In various embodiments, the ratio of the mole % of Al2O3 and B2O3 to Na2O, K2O, and CaO is about 0.95 to about 1.05, such as about 0.95 to about 1.03, about 0.95 to about 1, about 0.95 to about 0.97, about 0.97 to about 1.05, about 0.97 to about 1.03, about 0.97 to about 1, about 1 to about 1.05, about 1 to about 1.03, about 1.03 to about 1.05, or any range including and / or between any two of these values.

[0058] In various embodiments, the core glass composition comprises about 0 mol% Y2O3 to about 3 mol% Y2O3, such as about 0 mol% Y2O3 to about 2 mol% Y2O3, about 0 mol% Y2O3 to about 1 mol% Y2O3, about 1 mol% Y2O3 to about 3 mol% Y2O3, about 1 mol% Y2O3 to about 2 mol% Y2O3, or about 2 mol% Y2O3 to about 3 mol% Y2O3, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition may not contain yttrium and yttrium-containing compounds.

[0059] In various embodiments, the core glass composition includes about 0 mol% La2O3 to about 3 mol% La2O3, such as about 0 mol% La2O3 to about 2 mol% La2O3, about 0 mol% La2O3 to about 1 mol% La2O3, about 1 mol% La2O3 to about 3 mol% La2O3, about 1 mol% La2O3 to about 2 mol% La2O3, or about 2 mol% La2O3 to about 3 mol% La2O3, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition may not include lanthanum and lanthanum-containing compounds.

[0060] In various embodiments, the core glass composition includes about 0 mol% ZrO2 to about 3 mol% ZrO2, such as about 0 mol% ZrO2 to about 2 mol% ZrO2, about 0 mol% ZrO2 to about 1 mol% ZrO2, about 1 mol% ZrO2 to about 3 mol% ZrO2, about 1 mol% ZrO2 to about 2 mol% ZrO2, or about 2 mol% ZrO2 to about 3 mol% ZrO2, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition may not include zirconium and zirconium-containing compounds.

[0061] In various embodiments, the core glass composition comprises about 0 mol% TiO2 to about 3 mol% TiO2, such as about 0 mol% TiO2 to about 2 mol% TiO2, about 0 mol% TiO2 to about 1 mol% TiO2, about 1 mol% TiO2 to about 3 mol% TiO2, about 1 mol% TiO2 to about 2 mol% TiO2, or about 2 mol% TiO2 to about 3 mol% TiO2, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition may not contain titanium and titanium-containing compounds.

[0062] In various embodiments, the core glass composition includes about 0 mol% BeO to about 3 mol% BeO, such as about 0 mol% BeO to about 2 mol% BeO, about 0 mol% BeO to about 1 mol% BeO, about 1 mol% BeO to about 3 mol% BeO, about 1 mol% BeO to about 2 mol% BeO, or about 2 mol% BeO to about 3 mol% BeO, or including any two of these values ​​and / or any range between any two of these values. In some embodiments, the core glass composition may not include beryllium and beryllium-containing compounds.

[0063] In various embodiments, the core glass composition includes about 0 mol% Ta2O5 to about 3 mol% Ta2O5, such as about 0 mol% Ta2O5 to about 2 mol% Ta2O5, about 0 mol% Ta2O5 to about 1 mol% Ta2O5, about 1 mol% Ta2O5 to about 3 mol% Ta2O5, about 1 mol% Ta2O5 to about 2 mol% Ta2O5, or about 2 mol% Ta2O5 to about 3 mol% Ta2O5, or including any two of these values ​​and / or any range between any two of these values. In some embodiments, the core glass composition may not include tantalum and tantalum-containing compounds.

[0064] In some embodiments, the core glass composition may include about 55 mol% SiO2 to about 60 mol% SiO2, about 0.1 mol% to about 4 mol% Al2O3, about 15 mol% B2O3 to about 20 mol% B2O3, about 13 mol% Na2O to about 23 mol% Na2O, about 0 mol% CaO to about 10 mol% CaO. The ratio of the mole % of Al2O3 and B2O3 to the mole % of Na2O and CaO is about 0.95 to about 1.05. The core glass composition may have a Young's modulus of about 70 GPa to about 85 GPa. The core glass composition may have a CTE of about 8.0 ppm / °C to 10.0 ppm / °C.

[0065] In other embodiments, the core glass composition may include about 55 mol% SiO2 to about 65 mol% SiO2, about 0.1 mol% to about 4 mol% Al2O3, about 15 mol% B2O3 to about 20 mol% B2O3, about 5 mol% Na2O to about 13 mol% Na2O, about 0.1 mol% K2O to about 4 mol% K2O, about 5 mol% CaO to about 13 mol% CaO. The ratio of the mole % of Al2O3 and B2O3 to the mole % of Na2O, K2O, and CaO is about 0.95 to about 1.05. The core glass composition may have a Young's modulus of about 79 GPa to about 83 GPa. The core glass composition may have a CTE of about 6.0 ppm / °C to 8.0 ppm / °C.

[0066] In various embodiments, the glass composition has a Young's modulus of at least 79 GPa, which can minimize deflection of the glass during processing and prevent damage to devices attached to the glass, such as when the glass is used as a carrier substrate for a microelectronic device. In some embodiments, the core glass composition has a Young's modulus greater than 79 GPa, greater than 85 GPa, greater than 90 GPa, greater than 95 GPa, or greater than 99 GPa. In some embodiments, the glass composition has a Young's modulus less than 100 GPa, less than 95 GPa, less than 90 GPa, less than 85 GPa, or less than 80 GPa. In some specific embodiments, the core glass composition has a Young's modulus of about 79 GPa to about 100 GPa, such as about 80 GPa to about 100 GPa, about 80 GPa to about 95 GPa, about 80 GPa to about 90 GPa, about 80 GPa to about 85 GPa, about 85 GPa to about 100 GPa, about 85 GPa to about 95 GPa, about 85 GPa to about 90 GPa, about 90 GPa to about 100 GPa, about 90 GPa to about 95 GPa, about 95 GPa to about 100 GPa, or any range including and / or between any two of these values. However, it is contemplated that the desired properties, including Young's modulus, may vary depending on the specific embodiment, end use, and processing requirements of the glass composition.

[0067] In various embodiments, the core glass composition has a coefficient of thermal expansion between 8.0 ppm / ° C. and 10.0 ppm / ° C. In some embodiments, the CTE is from about 8.0 ppm / ° C. to about 10.0 ppm / ° C., such as from about 8.0 ppm / ° C. to about 9.5 ppm / ° C., from about 8.0 ppm / ° C. to about 9.0 ppm / ° C., from about 8.0 ppm / ° C. to about 8.5 ppm / ° C., from about 8.5 ppm / ° C. to about 10.0 ppm / ° C., from about 8.5 ppm / ° C. to about 9.5 ppm / ° C., from about 8.5 ppm / ° C. to about 9.0 ppm / ° C., from about 9.0 ppm / ° C. to about 10.0 ppm / ° C., from about 9.0 ppm / ° C. to about 9.5 ppm / ° C., from about 9.5 ppm / ° C. to about 10.0 ppm / ° C., or any range including any two of these values ​​and / or between any two of these values.

[0068] In some embodiments, each of the core glass compositions has a liquidus viscosity suitable for forming a glass article using the fusion draw process described herein. For example, each of the core glass compositions can have a liquidus viscosity of at least about 5 kP, at least about 50 kP, at least about 100 kP, or at least about 200 kP. Additionally or alternatively, each of the core glass compositions comprises a liquidus viscosity of less than about 3000 kP, less than about 2000 kP, less than about 1000 kP, less than about 500 kP, less than about 200 kP, less than about 100 kP, or less than about 75 kP. In some embodiments, the liquidus viscosity of the core glass layer can be from about 5 kP to about 3000 kP, such as from about 5 kP to about 2000 kP, from about 100 kP to about 1500 kP, from about 200 kP to about 1000 kP, from about 500 kP to about 800 kP, from about 5 kP to about 100 kP, or from about 5 kP to about 75 kP, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition can have a liquidus viscosity of from about 5 kP to about 75 kP.

[0069] The core glass composition and the cladding glass composition of the present disclosure advantageously have a high Young's modulus, a desired CTE, and improved durability while maintaining the melting and forming properties of the glass. The glass composition may optionally include additional components for changing the physical and chemical properties (e.g., refractive index, glass stability, chemical durability, etc.) of the glass. For example, in various embodiments, the inclusion of one or more alkali metal oxides in the glass composition may enable the glass composition to be ion exchanged according to methods known and used in the art. In some embodiments, the glass composition is chemically strengthened by an ion exchange process. Ion exchange can further strengthen the glass composition and change the stress in the glass article formed by the glass composition. However, in some embodiments, the glass article formed by the glass composition is not ion exchanged because ion exchange may cause dimensional changes or warping of the glass article.

[0070] Coating composition

[0071] The glass composition for the coating layer may include a base composition that is mainly aluminoborosilicate. Therefore, the base composition of the coating layer glass may generally include a combination of SiO2, Al2O3 and B2O3. The glass composition may also include at least one alkaline earth metal oxide, such as MgO and CaO. The coating glass composition may include at least one alkali metal oxide, such as Na2O and K2O. In some embodiments, the coating glass composition may also include one or more additional oxides, such as but not limited to Y2O3, La2O3, ZrO2, TiO2, BeO or Ta2O5, etc. The coating glass composition may generally include a combination of SiO2, Al2O3, B2O3 and a modifier, wherein the modifier is at least one of MgO and CaO. The modifier for the coating glass layer may include alkaline earth metal oxides, such as MgO and CaO. The glass composition described in this section may be used to form the glass coating layer 104 described in further detail herein.

[0072] In various embodiments, the coating glass composition generally includes SiO2 in an amount of about 40 mol% to about 65 mol%. When the content of SiO2 is too small, the glass may have poor chemical and mechanical durability. On the other hand, when the content of SiO2 is too large, the melting ability of the glass is reduced and the viscosity is increased, so the formation of the glass becomes difficult. In some embodiments, SiO is present in the coated glass composition in an amount of about 40 mol % to about 65 mol %, such as about 40 mol % to about 60 mol %, about 40 mol % to about 55 mol %, about 40 mol % to about 50 mol %, about 40 mol % to about 45 mol %, about 45 mol % to about 65 mol %, about 45 mol % to about 60 mol %, about 45 mol % to about 55 mol %, about 45 mol % to about 50 mol %, about 50 mol % to about 65 mol %, about 50 mol % to about 60 mol %, about 50 mol % to about 55 mol %, about 55 mol % to about 65 mol %, about 55 mol % to about 60 mol %, about 60 mol % to about 65 mol %, or includes any two of these values ​​and / or any range between any two of these values. For example, SiO is present in the coated glass composition in an amount of about 40 mol % to about 60 mol % or about 55 mol % to about 65 mol %.

[0073] The coating glass composition can also include Al2O3.Al2O3 and the alkali metal oxide present in the glass composition such as Na2O, K2O etc. combine to improve the sensitivity of glass to ion exchange strengthening.In addition, the Al2O3 of increasing amount can also improve the softening point of glass, thereby reduce the formability of glass.Coating glass composition as herein described can include about 0.1 mol % to about 20 mol %, such as about 0.1 mol % to about 15 mol %, about 0.1 mol % to about 10 mol %, about 0.1 mol % to about 5 mol %, about 5 mol % to about 20 mol %, about 5 mol % to about 15 mol %, about 5 mol % to about 10 mol %, about 10 mol % to about 20 mol %, about 10 mol % to about 15 mol %, about 15 mol % to about 20 mol % of the amount of Al2O3, or include any two of these values ​​and / or any scope between any two of these values.For example, Al2O3 is present in the coating glass composition with the amount of about 7 mol % to about 17 mol % or about 0.1 mol % to about 4 mol %.

[0074] In some embodiments described herein, boron may be added to the cladding glass composition to make the viscosity-temperature curve less steep and to lower the overall curve to improve the formability of the glass and soften the glass. In various embodiments, the coating glass composition includes about 5 mol % B2O3 to about 25 mol % B2O3, such as about 5 mol % B2O3 to about 20 mol % B2O3, about 5 mol % B2O3 to about 15 mol % B2O3, about 5 mol % B2O3 to about 10 mol % B2O3, about 10 mol % B2O3 to about 25 mol % B2O3, about 10 mol % B2O3 to about 20 mol % B2O3, about 10 mol % B2O3 to about 15 mol % B2O3, about 15 mol % B2O3 to about 25 mol % B2O3, about 15 mol % B2O3 to about 20 mol % B2O3, about 20 mol % B2O3 to about 25 mol % B2O3, or any range including any two of these values ​​and / or between any two of these values. For example, B2O3 is present in the encapsulating glass composition in an amount of about 4 mol% to about 20 mol% or about 15 mol% to about 20 mol%.

[0075] In various embodiments, the coating glass composition generally includes a modifier. The modifier is at least one of MgO and CaO. In various embodiments, the coating glass composition includes about 10 mol% of the modifier to about 40 mol% of the modifier, such as 10 mol% of the modifier to about 35 mol% of the modifier, 10 mol% of the modifier to about 25 mol% of the modifier, 10 mol% of the modifier to about 20 mol% of the modifier, 10 mol% of the modifier to about 15 mol% of the modifier, about 15 mol% of the modifier to about 40 mol% of the modifier, 15 mol% of the modifier to about 35 mol% of the modifier, 15 mol% of the modifier to about 25 mol% of the modifier Modifier, 15 mol % modifier to about 20 mol % modifier, about 20 mol % modifier to about 40 mol % modifier, 20 mol % modifier to about 35 mol % modifier, 20 mol % modifier to about 25 mol % modifier, about 25 mol % modifier to about 40 mol % modifier, 25 mol % modifier to about 35 mol % modifier, about 35 mol % modifier to about 40 mol % modifier, or any range including any two of these values ​​and / or any range between any two of these values. For example, MgO is present in the cladding glass composition in an amount of about 0 mol % to about 23 mol % or about 10 mol % to about 23 mol %. For example, CaO is present in the core glass composition in an amount of about 5 mol % to about 23 mol % or about 5 mol % to about 13 mol %. For example, K2O is present in the core glass composition in an amount of about 0.1 mol % to about 4 mol %.

[0076] In various embodiments, the coating glass composition comprises about 0 mol% Y2O3 to about 3 mol% Y2O3, such as about 0 mol% Y2O3 to about 2 mol% Y2O3, about 0 mol% Y2O3 to about 1 mol% Y2O3, about 1 mol% Y2O3 to about 3 mol% Y2O3, about 1 mol% Y2O3 to about 2 mol% Y2O3, or about 2 mol% Y2O3 to about 3 mol% Y2O3, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the coating glass composition may not include yttrium and yttrium-containing compounds.

[0077] In various embodiments, the coating glass composition includes about 0 mol% La2O3 to about 3 mol% La2O3, such as about 0 mol% La2O3 to about 2 mol% La2O3, about 0 mol% La2O3 to about 1 mol% La2O3, about 1 mol% La2O3 to about 3 mol% La2O3, about 1 mol% La2O3 to about 2 mol% La2O3, or about 2 mol% La2O3 to about 3 mol% La2O3, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the coating glass composition may not include lanthanum and lanthanum-containing compounds.

[0078] In various embodiments, the coating glass composition includes about 0 mol% ZrO2 to about 3 mol% ZrO2, such as about 0 mol% ZrO2 to about 2 mol% ZrO2, about 0 mol% ZrO2 to about 1 mol% ZrO2, about 1 mol% ZrO2 to about 3 mol% ZrO2, about 1 mol% ZrO2 to about 2 mol% ZrO2, or about 2 mol% ZrO2 to about 3 mol% ZrO2, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the coating glass composition may not include zirconium and zirconium-containing compounds.

[0079] In various embodiments, the coating glass composition comprises about 0 mol % TiO2 to about 3 mol % TiO2, such as about 0 mol % TiO2 to about 2 mol % TiO2, about 0 mol % TiO2 to about 1 mol % TiO2, about 1 mol % TiO2 to about 3 mol % TiO2, about 1 mol % TiO2 to about 2 mol % TiO2, or about 2 mol % TiO2 to about 3 mol % TiO2, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the coating glass composition may not include titanium and titanium-containing compounds.

[0080] In various embodiments, the cladding glass composition comprises about 0 mol% BeO to about 3 mol% BeO, such as about 0 mol% BeO to about 2 mol% BeO, about 0 mol% BeO to about 1 mol% BeO, about 1 mol% BeO to about 3 mol% BeO, about 1 mol% BeO to about 2 mol% BeO, or about 2 mol% BeO to about 3 mol% BeO, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the cladding glass composition may not contain beryllium and beryllium-containing compounds.

[0081] In various embodiments, the coating glass composition includes about 0 mol% Ta2O5 to about 3 mol% Ta2O5, such as about 0 mol% Ta2O5 to about 2 mol% Ta2O5, about 0 mol% Ta2O5 to about 1 mol% Ta2O5, about 1 mol% Ta2O5 to about 3 mol% Ta2O5, about 1 mol% Ta2O5 to about 2 mol% Ta2O5, or about 2 mol% Ta2O5 to about 3 mol% Ta2O5, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the coating glass composition may not include tantalum and tantalum-containing compounds.

[0082] In some embodiments, the coating glass composition may include about 40 mol% SiO2 to about 60 mol% SiO2, about 7 mol% to about 17 mol% Al2O3, about 4 mol% B2O3 to about 20 mol% B2O3, about 0 mol% MgO to about 23 mol% Na2O, about 5 mol% CaO to about 23 mol% CaO. The coating glass composition may have a Young's modulus of about 80 GPa to about 95 GPa. The coating glass composition may have a CTE of about 4.0 ppm / °C to 6.0 ppm / °C.

[0083] In other embodiments, the coating glass composition may include about 55 mol% SiO2 to about 65 mol% SiO2, about 0.1 mol% to about 4 mol% Al2O3, about 15 mol% B2O3 to about 20 mol% B2O3, about 5 mol% Na2O to about 13 mol% Na2O, about 0.1 mol% K2O to about 4 mol% K2O, about 5 mol% CaO to about 13 mol% CaO. The ratio of the mole % of Al2O3 and B2O3 to Na2O, K2O and CaO is about 0.95 to about 1.05. The coating glass composition may have a Young's modulus of about 79 GPa to about 83 GPa. The coating glass composition may have a CTE of about 6.0 ppm / ℃ to 8.0 ppm / ℃.

[0084] In various embodiments, the coating glass composition has a Young's modulus of at least 79 GPa, which can minimize deflection of the glass during processing and prevent damage to devices attached to the glass, such as when the glass is used as a carrier substrate for electronic devices. In some embodiments, the glass composition has a Young's modulus greater than 79 GPa, greater than 85 GPa, greater than 90 GPa, greater than 95 GPa, or greater than 99 GPa. In some embodiments, the glass composition has a Young's modulus less than 100 GPa, less than 95 GPa, less than 90 GPa, less than 85 GPa, or less than 80 GPa. In some specific embodiments, the glass composition has a Young's modulus of about 79 GPa to about 100 GPa, such as about 80 GPa to about 100 GPa, about 80 GPa to about 95 GPa, about 80 GPa to about 90 GPa, about 80 GPa to about 85 GPa, about 85 GPa to about 100 GPa, about 85 GPa to about 95 GPa, about 85 GPa to about 90 GPa, about 90 GPa to about 100 GPa, about 90 GPa to about 95 GPa, about 95 GPa to about 100 GPa, or any range including and / or between any two of these values. However, it is contemplated that the desired properties, including Young's modulus, may vary depending on the specific embodiment, end use, and processing requirements of the glass composition.

[0085] In various embodiments, the coating glass composition has a coefficient of thermal expansion between 3.5 ppm / °C and 5.5 ppm / °C. In some embodiments, the CTE 包覆 It is about 3.5ppm / ℃ to about 5.5ppm / ℃, such as about 3.5ppm / ℃ to about 5.0ppm / ℃, about 3.5ppm / ℃ to about 4.5ppm / ℃, about 3.5ppm / ℃ to about 4.0ppm / ℃, about 4.0ppm / ℃ to about 5.5ppm / ℃, about 4.0ppm / ℃ to about 5.0ppm / ℃, about 4.0ppm / ℃ to about 4.5ppm / ℃, about 4.5ppm / ℃ to about 5.5ppm / ℃, about 4.5ppm / ℃ to about 5.0ppm / ℃, about 5.0ppm / ℃ to about 5.5ppm / ℃, or any range including any two of these values ​​and / or between any two of these values.

[0086] In some embodiments, each of the core glass compositions has a liquidus viscosity suitable for forming a glass article using the fusion draw process described herein. For example, each of the core glass compositions can have a liquidus viscosity of at least about 5 kP, at least about 50 kP, at least about 100 kP, or at least about 200 kP. Additionally or alternatively, each of the core glass compositions comprises a liquidus viscosity of less than about 3000 kP, less than about 2000 kP, less than about 1000 kP, less than about 500 kP, less than about 200 kP, less than about 100 kP, or less than about 75 kP. In some embodiments, the liquidus viscosity of the core glass layer can be from about 5 kP to about 3000 kP, such as from about 5 kP to about 2000 kP, from about 100 kP to about 1500 kP, from about 200 kP to about 1000 kP, from about 500 kP to about 800 kP, from about 5 kP to about 100 kP, or from about 5 kP to about 75 kP, or any range including any two of these values ​​and / or between any two of these values. In some embodiments, the core glass composition can have a liquidus viscosity of from about 5 kP to about 75 kP.

[0087] Devices comprising the glass articles of the above compositions can be formed. Exemplary devices can include, but are not limited to, electronic devices, automotive devices, architectural devices, or electrical devices. The glass articles can form glass laminates for microelectronic applications, such as carrier materials. The glass articles can be 3D formed into complex shapes.

[0088] method

[0089] Various methods can be used to produce the glass compositions and articles described herein. For example, any suitable method can be used to make the glass article 100. Generally, the glass article 100 and any layers 102, 104, 106 in the glass article 100 can be made using any method disclosed in U.S. Patent No. 9,340,451 entitled “Machining of Fusion-Drawn Glass Laminate Structures Containing a Photomachinable Layer” issued on May 17, 2016 and U.S. Patent Application Publication No. 2017 / 0073266 entitled “Glass Article and Method for Forming the Same” published on March 16, 2017, each of which is incorporated herein by reference in its entirety.

[0090] In another embodiment, the core glass composition can be produced by a method including melting batch materials and forming a precursor glass, wherein the precursor glass comprises: about 50 mol % to about 70 mol % SiO2, about 0.1 mol % to about 10 mol % Al2O3, about 5 mol % to about 25 mol % B2O3 and about 10 mol % to about 30 mol % of a modifier, wherein the modifier is at least one of Na2O, K2O and CaO.

[0091] In another embodiment, a laminated glass article can be produced by a method comprising contacting a molten core glass composition with a molten cladding glass composition to form a laminated glass article comprising a glass core layer disposed between a first glass cladding layer and a second glass cladding layer. The glass core layer can comprise a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) has a core glass composition between 8.0 ppm / °C and 10.0 ppm / °C, and the first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) of the cladding glass composition between 3.5 ppm / °C and 5.5 ppm / °C.

[0092] Example

[0093] Various embodiments will be further illustrated by the following examples, which are in no way intended to limit the present disclosure thereto.

[0094] Example 1: Core composition

[0095] Table 1 provides an example of a representative core glass composition according to the present technology. The exemplary core layer glass described herein exhibits a base composition comprising the components listed in Table 1 (in mole %). Various properties of the glass are also listed in Table 1. Glass 1 and Glass 2 are exemplary embodiments of core glass. The composition of the standard glass is shown in the comparative example. As shown, in glass 1, which is completely modified by sodium, the modulus exceeds 80 GPa and the CTE is 9.3 ppm / °C. In glass 2, in which Na is partially replaced by Ca, the modulus is maintained above 80 GPa while the CTE is reduced to 8.0 ppm / °C. Therefore, the glass composition can be modified to adjust the CTE value as desired without negatively affecting the high modulus. In addition, it can be seen from the table that the CTE and Young's modulus of the comparative example are lower than the CTE and Young's modulus of the core composition.

[0096]

[0097]

[0098] Example 2: Coating composition

[0099] Table 2 provides examples of representative coating compositions according to the present technology. The exemplary coating glasses described herein exhibit a base composition comprising the ingredients listed in Table 2 (in mole %). Various properties of the glass are also listed in Table 2. These exemplary glass compositions have the high modulus and low CTE required for coating layer glasses.

[0100]

[0101] Example 3: Extended Composition

[0102] Table 3 provides examples of representative compositions according to the present technology. These representative compositions have high modulus and medium CTE and can be core compositions or coating compositions. The exemplary glasses described herein exhibit a base composition comprising the ingredients listed in Table 3 (in mole %). Various properties of the glass are also listed in Table 3. These compositions also include the use of K2O, which can be used to adjust CTE properties. Compositions 8 and 9 follow the (Al2O3+B2O3) / (Na2O+CaO) rule and demonstrate the effect of replacing Na with additional Ca. Compositions 10, 11, and 12 follow the (Al2O3+B2O3) / (Na2O+K2O+CaO) rule, but open up the composition space to allow the incorporation of K2O to adjust properties such as CTE to a greater extent.

[0103]

[0104] definition

[0105] The term "coefficient of thermal expansion" or CTE is the average CTE over a particular temperature range. In various embodiments, the coefficient of thermal expansion of the glass composition is averaged over a temperature range of about 0° C. to about 300° C. In some embodiments, the coefficient of thermal expansion of the glass composition is averaged over a temperature range of about 20° C. to about 260° C.

[0106] In some embodiments, such as when the glass can be flame processed, the CTE can be determined via a dilatometer in the temperature range of 0°C to 300°C. The glass is flame processed to a specific size with a tip. The sample is first immersed in a zero degree ice bath, and then immersed in a 300°C bath, and the length of the sample is measured each time. The CTE is then calculated based on these two measurements.

[0107] In other embodiments, such as when the glass is not flame processable (e.g., glass laminates), the CTE is measured via a dilatometer over a temperature range of 20°C to a maximum of 1000°C. The glass is machined to a specific size with very flat ends and placed in a small furnace that is heated and cooled at a predetermined rate (e.g., ramped up at 4°C / min, held for 5 minutes, and ramped down at 4°C / min), and the temperature and length of the sample are measured in real time. A thermal expansion curve during both heating and cooling can be obtained. The average CTE value over a specific temperature range can be obtained from this measurement of the heating and cooling curves.

[0108] The elastic modulus (also known as Young's modulus) of the substrate is provided in units of gigapascal (GPa).The elastic modulus of the substrate is determined by resonant ultrasonic spectroscopy on a bulk sample of the substrate.

[0109] As used herein, the term "softening point" refers to the viscosity of the glass composition at 1x10 7.6 The temperature during parking.

[0110] As used herein, the terms "annealing point" and "annealing temperature" refer to the viscosity of the glass composition at 1x10 13 The temperature during parking.

[0111] As used herein, the terms "strain point" and "T 应变 " refers to the viscosity of the glass composition of 3x10 14 The temperature during parking.

[0112] As used herein, "transmittance," "transmittance," "light transmittance," and "total transmittance" are used interchangeably in this disclosure and refer to external transmittance or transmittance that takes into account absorption, scattering, and reflection. Fresnel reflections are not subtracted from the transmittance and transmittance values ​​reported herein. In addition, any total transmittance value mentioned within a particular wavelength range is given as the average of the total transmittance values ​​measured within that specified wavelength range. In addition, "average absorbance" as used herein is defined as:

[0113]

[0114] The concentration distribution of various constituent components (such as alkaline constituent components) in the glass is determined by electron probe microanalysis (EPMA). For example, EPMA can be used to distinguish compressive stress in the glass caused by ion exchange of alkaline ions into the glass from compressive stress caused by lamination.

[0115] The terms "glass" and "glass composition" encompass glass materials and glass-ceramic materials, as both classes of materials are commonly understood. Likewise, the term "glass structure" encompasses structures comprising glass. The term "reconstituted wafer and / or panel level package" encompasses reconstituted substrate packages of any size, including wafer level packages and panel level packages.

[0116] The term "formed from" may mean one or more of comprising, consisting essentially of, or consisting of. For example, a component formed from a particular material may include, consist essentially of, or consist of the particular material.

[0117] As used herein, the terms "ion-exchanged," "ion exchanged," or "ion-exchangeable" are understood to mean treating the glass with a heated solution containing ions having a different ionic radius than ions present at the surface and / or in the bulk of the glass, thereby replacing those ions with, for example, smaller ions. For example, potassium can enter the glass to replace sodium ions.

[0118] Unless otherwise indicated, directional terms used herein—eg, up, down, right, left, front, back, top, bottom, vertical, horizontal—are used only with reference to the drawings in which they are drawn and are not intended to imply an absolute orientation.

[0119] Unless otherwise expressly stated, any method described herein should in no way be construed as requiring that its steps be performed in a particular order, or requiring a particular orientation for any apparatus. Thus, if a method claim does not actually recite an order in which its steps are to be followed, or any apparatus claim does not actually recite an order or orientation of individual components, or if the claims or specification do not otherwise specifically state that the steps are limited to a particular order, or if a particular order or orientation of apparatus components is not recited, then in no way should an order or orientation be inferred. This applies to any possible non-expressive basis for interpretation, including: questions of logic involving arrangement of steps, operational flow, order of components, or orientation of components; questions of obvious meaning derived from grammatical organization or punctuation, and; questions of the number or type of embodiments described in the specification.

[0120] Unless the context clearly indicates otherwise, as used herein, the singular forms "a", "an", and "the" include plural referents. Thus, for example, reference to "a" component includes aspects having two or more such components, unless the context clearly indicates otherwise. In addition, the word "or" should be interpreted as inclusive (e.g., "x or y" means one or both of x or y) without the preceding "either" (or other similar language indicating that "or" clearly indicates exclusivity - e.g., only one of x or y, etc.).

[0121] The term "and / or" should also be interpreted as inclusive (e.g., "x and / or y" means one or both of x or y). Where "and / or" or "or" is used to connect a group of three or more items, the group should be interpreted to include one item alone, all items together, or any combination of these items or any number of these items. In addition, terms such as have, have, include, and include (including) used in the specification and claims should be interpreted as synonymous with the terms comprise and comprise. In addition to the elements specifically indicated by the "and / or" clause, other elements may optionally be present, whether related or unrelated to those specifically indicated. As a non-limiting example, in one embodiment, reference to "X and / or Y" may refer to only X (optionally including elements other than Y); in another embodiment, may refer to only Y (optionally including elements other than X); in yet another embodiment, involves both X and Y (optionally including other elements).

[0122] All disclosed ranges should be understood to cover and provide support for claims stating any and all sub-ranges or any and all single values ​​contained in each range. For example, the stated range of 1 to 10 should be considered to include and provide support for claims stating any and all sub-ranges or single values ​​between and / or including a minimum value of 1 and a maximum value of 10; that is, all sub-ranges (e.g., 5.5 to 10, 2.34 to 3.56, etc.) starting from a minimum value of 1 or greater and ending with a maximum value of 10 or less or any value of 1 to 10 (e.g., 3, 5.8, 9.9994, etc.). Any listed range can be easily considered to be fully described and ensure that the same range can be decomposed into at least equal two, three, four, five, ten, etc. As a non-limiting example, each range discussed herein can be easily decomposed into a lower third, a middle third, and an upper third, etc. It will also be understood by those skilled in the art that all languages ​​such as "up to", "at least", "greater than", "less than", etc. include the numbers listed and refer to the ranges that can be subsequently decomposed into sub-ranges as described above. Finally, as will be understood by one skilled in the art, a range includes each individual member. Thus, for example, a group having 1-3 layers refers to groups having 1, 2, or 3 layers. Similarly, a group having 1-5 layers refers to groups having 1, 2, 3, 4, or 5 layers, and so on.

[0123] The drawings should be interpreted as illustrating one or more embodiments drawn to scale and / or one or more embodiments not drawn to scale. This means that the drawings may be interpreted as showing, for example: (a) each feature is drawn to scale, (b) no features are drawn to scale, or (c) one or more features are drawn to scale and one or more features are not drawn to scale. Thus, the drawings may be used to provide support for stating the size, proportion, and / or other dimensions of any illustrated feature, either individually or relative to each other. Furthermore, all such sizes, proportions, and / or other dimensions should be understood to be variable from 0-100% in either direction, and therefore provide support for claims stating such values ​​or any and all ranges or sub-ranges that may be formed from such values.

[0124] Terms recited in the claims should be given their ordinary and customary meanings as commonly understood by persons skilled in the art as determined by reference to relevant entries in widely used general dictionaries and / or dictionaries of relevant technology, etc., with the understanding that the broadest meaning given by any one or combination of these sources should be given to claim terms (e.g., two or more relevant dictionary entries should be combined to provide the broadest meaning of the combination of the entries, etc.), except that (a) if a term is used in a manner broader than its ordinary and customary meaning, the term should be given its ordinary and customary meaning plus such additional broad meaning, or (b) if the term is expressly defined to have a different meaning by stating that the term is followed by the phrase "as used herein" or similar language (e.g., "the term means," "the term is defined as," "for purposes of this disclosure, the term shall mean," etc.). Reference to specific examples, use of "i.e.," use of the word "inventory," etc. are not intended to create exception (b) or otherwise limit the scope of the recited claim terms. Except where exception (b) applies, nothing contained in this document shall be construed as a waiver or objection to the scope of the claims.

[0125] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the same meaning as they have in the context of the present application and the related art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in this article. Although not explicitly defined below, these terms should be interpreted according to their ordinary meanings.

[0126] In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.

[0127] Unless the context indicates otherwise, it is specifically intended that the various features of the invention described herein may be used in any combination. In addition, the present disclosure also contemplates that in some embodiments, any feature or combination of features set forth herein may be excluded or omitted. For illustration, if the specification states that a composite comprises components A, B, and C, it is specifically intended that any one or combination of A, B, or C may be omitted and excluded, individually or in any combination.

[0128] Unless expressly stated otherwise, all specific embodiments, features, and terms are intended to include both the stated embodiment, feature, or term and its biological equivalents.

[0129] All patents, patent applications, provisional applications, and publications mentioned or cited herein are incorporated by reference in their entirety, including all figures and tables, to the extent not inconsistent with the explicit teachings of this specification.

[0130] As used herein, "about" will be understood by one of ordinary skill in the art and will vary to some extent depending on the context in which it is used. If the use of the term is unclear to one of ordinary skill in the art, "about" will mean up to ±10% of the specific term in the context in which it is used.

[0131] When the scope of providing the composition of this paper is 0-Z weight %, the scope refers to the amount of the material added in the batch and has eliminated the pollutant level of the same material.As understood by those skilled in the art, metals such as sodium and iron are often present in batch glass and glass products with pollutant level.Therefore, it should be understood that, when material is not added in the batch especially, any material that may be present in the analysis sample of the final glass material added is a pollutant material.Except iron oxide, wherein the pollutant level is generally about 0.03 weight % (300ppm) level, the pollutant level is less than 0.005 weight % (50ppm).Term " substantially uniformly " should be interpreted as not including any material of pollutant level.

Claims

1. A glass composition comprising: 50 mol % to 70 mol % SiO2; 0.1 mol% to 10 mol% Al2O3; 5 mol % to 25 mol % B2O3; and 10 mol % to 30 mol % of a modifier, wherein the modifier is the total amount of Na2O, K2O and CaO, wherein the ratio of Al2O3 and B2O3 to the modifier is 0.95 to 1.05 in mole %, The glass composition has a Young's modulus of at least 79 GPa and a thermal expansion coefficient of 8.0 ppm / °C to 10.0 ppm / °C.

2. The glass composition according to claim 1, wherein the glass composition comprises 0.1 mol % to 8 mol % of Al2O3.

3. The glass composition according to claim 2, wherein the glass composition has a Young's modulus of less than 100 GPa.

4. The glass composition according to claim 2, wherein the glass composition comprises 15 mol% to 20 mol% B2O3.

5. The glass composition of claim 1, wherein the glass composition comprises 15 mol% to 20 mol% B2O3.

6. The glass composition of claim 4, wherein the glass composition comprises 0.1 mol% to 4 mol% Al2O3.

7. The glass composition according to claim 1, wherein the boron in B2O3 is in a tetrahedral configuration.

8. The glass composition according to claim 1, further comprising 0 mol% to 3 mol% of one or more of Y2O3, La2O3, ZrO2, TiO2, BeO or Ta2O5.

9. A glass article comprising a glass core layer disposed between a first glass cladding layer and a second glass cladding layer, wherein the glass core layer comprises the glass composition of claim 1.

10. A glass product comprising: A glass core layer disposed between a first glass cladding layer and a second glass cladding layer, wherein: The glass core layer comprises a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) a glass composition between 8.0 ppm / °C and 10.0 ppm / °C, and The first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) a glass composition between 3.5 ppm / °C and 5.5 ppm / °C, The glass composition of at least one of the first glass cladding layer and the second glass cladding layer comprises: 40 mol % to 65 mol % SiO2; 0.1 mol % to 20 mol % Al2O3; 5 mol % to 25 mol % B2O3; and 5 mol% to 40 mol% of a modifier, wherein the modifier comprises (i) MgO in an amount of 10 mol.% to 23 mol.% or (ii) 0 mol% MgO and CaO in an amount of 5 mol.% to 23 mol.%.

11. The glass article of claim 10, wherein the glass article has a coefficient of thermal expansion (CTE) between 3.5 ppm / °C and 10.0 ppm / °C. 制品 ).

12. The glass article of claim 10, wherein the glass article has a coefficient of thermal expansion (CTE) between 4 ppm / °C and 9.5 ppm / °C. 制品 ).

13. The glass article of claim 10, wherein the glass article has a Young's modulus (Y 制品 ).

14. The glass article of claim 10, wherein the glass composition of the glass core layer comprises: 50 mol % to 70 mol % SiO2; 0.1 mol% to 10 mol% Al2O3; 5 mol % to 25 mol % B2O3; and 10 mol% to 30 mol% of a modifier, wherein the modifier is the total amount of Na2O, K2O and CaO.

15. The glass article of claim 10, wherein the glass composition of the first glass cladding layer and the second glass cladding layer are the same.

16. The glass article of claim 10, wherein the glass core layer has an average core coefficient of thermal expansion (CTE 平均芯 ) and the first glass cladding layer and the second glass cladding layer have a coefficient of thermal expansion (CTE) less than the average core 平均芯 ) of the average coating thermal expansion coefficient (CTE 平均包覆 ).

17. A method of forming a glass composition, the method comprising: The batch materials are melted and a precursor glass is formed, the precursor glass comprising: 50 mol % to 70 mol % SiO2; 0.1 mol% to 10 mol% Al2O3; 5 mol % to 25 mol % B2O3; and 10 mol % to 30 mol % of a modifier, wherein the modifier is the total amount of Na2O, K2O and CaO, wherein the ratio of Al2O3 and B2O3 to the modifier is 0.95 to 1.05 in mole %, The glass composition has a Young's modulus of at least 79 GPa and a thermal expansion coefficient of 8.0 ppm / °C to 10.0 ppm / °C.

18. A method for forming a laminated glass article, the method comprising: contacting a molten core glass composition with a molten cladding glass composition to form a laminated glass article comprising a glass core layer disposed between a first glass cladding layer and a second glass cladding layer, wherein The glass core layer comprises a Young's modulus (Y 芯 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 芯 ) a glass composition between 8.0 ppm / °C and 10.0 ppm / °C, and The first glass cladding layer and the second glass cladding layer comprise a Young's modulus (Y 包覆 ) is at least 79 GPa and the coefficient of thermal expansion (CTE 包覆 ) a glass composition between 3.5 ppm / °C and 5.5 ppm / °C, The glass composition of at least one of the first glass cladding layer and the second glass cladding layer comprises: 40 mol % to 65 mol % SiO2; 0.1 mol % to 20 mol % Al2O3; 5 mol % to 25 mol % B2O3; and 5 mol% to 40 mol% of a modifier, wherein the modifier comprises (i) MgO in an amount of 10 mol.% to 23 mol.% or (ii) 0 mol% MgO and CaO in an amount of 5 mol.% to 23 mol.%.

19. A device comprising the glass composition of any one of claims 1 to 9.

20. The device according to claim 19, which is an electronic device, an automotive device, a building device or an electrical device.

21. A device comprising the glass article of any one of claims 10 to 16.

22. The device according to claim 21, which is an electronic device, an automotive device, a building device or an electrical device.

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