# US 9,517,966 B2 · Glass compositions with improved chemical and mechanical durability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,966 B2 - Document ID: US9517966B2 - Status: Granted - Kind: B2 - Application number: 14/520,722 - Filed: 2014-10-22 - Published: 2015-02-05 - Granted: 2016-12-13 - Earliest claimed: 2011-10-25 - Assignees: Corning Incorporated - Applicants: Corning Incorporated - Inventors: Paul Stephen Danielson; Steven Edward DeMartino; Melinda Ann Drake; Robert Michael Morena; Santona Pal; Robert Anthony Schaut - Web page: https://patentgrep.com/patent/US9517966B2 ## CPC - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 3/091: containing aluminium - C03C 4/20: for chemical resistant glass - C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)} - Y10T 428/131: Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.] - Y10T 428/1317: Multilayer [continuous layer] - Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension - Y10T 428/265: 1 mil or less - Y10T 428/315: Surface modified glass [e.g., tempered, strengthened, etc.] - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The embodiments described herein relate to chemically and mechanically durable glass compositions and glass articles formed from the same. In another embodiment, a glass composition may include from about 70 mol. % to about 80 mol. % SiO2; from about 3 mol. % to about 13 mol. % alkaline earth oxide; X mol. % Al2O3; and Y mol. % alkali oxide. The alkali oxide may include Na2O in an amount greater than about 8 mol. %. A ratio of Y:X may be greater than 1 and the glass composition may be free of boron and compounds of boron. In some embodiments, the glass composition may also be free of phosphorous and compounds of phosphorous. Glass articles formed from the glass composition may have at least a class S3 acid resistance according to DIN 12116, at least a class A2 base resistance according to ISO 695, and a type HGA1 hydrolytic resistance according to ISO 720. ## Claims ### Claim 1 A glass article formed from a glass composition comprising: SiO2 in an amount greater than 70 mol. % and less than or equal to 80 mol. %; from 4 mol. % to 8 mol. % alkaline earth oxide, the alkaline earth oxide comprising CaO; X mol. % Al2O3; and Y mol. % alkali oxide, wherein the alkali oxide comprises Na2O in an amount greater than or equal to 9 mol. % and less than or equal to 13 mol. %, wherein: a ratio of a concentration of B2O3 (mol. %) in the glass composition to (Y mol. %-X mol. %) is less than 0.3; a ratio of Y:X is greater than 1 and less than or equal to 2; the glass article has a compressive stress layer extending from a surface of the glass article to a depth of greater than or equal to 10 microns, the compressive stress layer having a surface compressive stress of greater than or equal to 250 MPa; and the glass article has a Vickers crack initiation threshold of at least 7 kgf. ### Claim 2 (depends on 1) The glass article of claim 1, wherein the Vickers crack initiation threshold is less than or equal to 30 kgf. ### Claim 3 (depends on 1) The glass article of claim 1, wherein the Vickers crack initiation threshold is greater than or equal to 10 kgf and less than or equal to 20 kgf. ### Claim 4 (depends on 1) The glass article of claim 1, wherein a ratio of Y:X is greater than or equal to 1.3 and less than or equal to 2.0. ### Claim 5 (depends on 1) The glass article of claim 1, wherein the glass article has a type HGB1 hydrolytic resistance according to ISO 719. ### Claim 6 (depends on 1) The glass article of claim 1, wherein the glass article has a type HGA1 hydrolytic resistance according to ISO 720. ### Claim 7 (depends on 1) The glass article of claim 1, wherein the glass article has at least a class S3 acid resistance according to DIN 12116. ### Claim 8 (depends on 1) The glass article of claim 1, wherein the glass article has at least a class A2 base resistance according to ISO 695. ### Claim 9 A glass article formed from a glass composition comprising: from 70 mol. % to 80 mol. % SiO2; from 4 mol. % to 8 mol. % alkaline earth oxide, the alkaline earth oxide comprising CaO; X mol. % Al2O3, wherein X is greater than or equal to 5 and less than or equal to 7; and Y mol. % alkali oxide, wherein the alkali oxide comprises Na2O in an amount greater than or equal to 9 mol. % and less than or equal to 13 mol. %, and the glass composition is free of boron and compounds of boron, wherein: the glass article has a compressive stress layer extending from a surface of the glass article to a depth of greater than or equal to 10 microns, the compressive stress layer having a surface compressive stress of greater than or equal to 250 MPa; and the glass article has a Vickers crack initiation threshold of at least 7 kgf. ### Claim 10 (depends on 9) The glass article of claim 9, wherein the Vickers crack initiation threshold is less than or equal to 30 kgf. ### Claim 11 (depends on 9) The glass article of claim 9, wherein the Vickers crack initiation threshold is greater than or equal to 10 kgf and less than or equal to 20 kgf. ### Claim 12 (depends on 9) The glass article of claim 9, wherein a ratio of Y:X is greater than 1. ### Claim 13 (depends on 12) The glass article of claim 12, wherein a ratio of Y:X is less than or equal to 2. ### Claim 14 (depends on 9) The glass article of claim 9, wherein a ratio of Y:X is greater than or equal to 1.3 and less than or equal to 2.0. ### Claim 15 (depends on 9) The glass article of claim 9, wherein the glass article has a type HGB1 hydrolytic resistance according to ISO 719. ### Claim 16 (depends on 9) The glass article of claim 9, wherein the glass article has a type HGA1 hydrolytic resistance according to ISO 720. ### Claim 17 (depends on 9) The glass article of claim 9, wherein the glass article has at least a class S3 acid resistance according to DIN 12116. ### Claim 18 (depends on 9) The glass article of claim 9, wherein the glass article has at least a class A2 base resistance according to ISO 695. ### Claim 19 (depends on 9) The glass article of claim 9 comprising from 72 mol. % to 78 mol. % SiO2 .