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CN-121990769-A - High-strength and high-toughness fracture-resistant ion exchange glass and preparation method and application thereof

CN121990769ACN 121990769 ACN121990769 ACN 121990769ACN-121990769-A

Abstract

The application relates to the field of reinforced glass, and particularly discloses high-strength and high-toughness fracture-resistant ion exchange glass as well as a preparation method and application thereof. The ion exchange glass is prepared from borosilicate base material glass with specific composition through chemical strengthening, and is characterized in that the fracture and elongation resisting characteristic factor D is more than or equal to 0.68 and less than or equal to 1.44. The factor D is represented by the relation The definition, wherein ICS30 stores compressive energy for compressive stress, satisfies 68≤ICS 30≤132. By cooperatively controlling key parameters such as fracture toughness Kc, elastic modulus E, vickers hardness H, compressive stress CS30 and the like of the base material glass in a specific optimization interval and limiting the proportion of key components such as SiO 2 +B 2 O 3 )/Al 2 O 3 and the like in the composition of the base material glass, the invention successfully improves the falling-resistant height of the glass to more than 180cm, and solves the industrial problem that the existing cover plate glass has insufficient impact resistance under the light and thin trend.

Inventors

  • SHEN ZIHAN
  • CHEN JIAJIA
  • YANG XIN
  • CAI ZHIHUA
  • XU GUOLIANG
  • HE HUACHAO
  • ZHANG JUN
  • DONG JUNWEI
  • YU RONGCAN
  • HU GUANG
  • ZHAO HONGMEI
  • Wan Junchi

Assignees

  • 四川虹科创新科技有限公司

Dates

Publication Date
20260508
Application Date
20251208

Claims (10)

  1. 1. The high-strength and high-toughness fracture-resistant ion exchange glass is characterized in that the ion exchange glass is obtained by a chemical strengthening process of base material glass, wherein the fracture-resistant flexural elongation characteristic factor D of the ion exchange glass is more than or equal to 0.68 and less than or equal to 1.44; the fracture resistance elongation characteristic factor D is defined by the following relation (1): (1) The compressive stress storage compression energy I CS30 of the high-strength and high-toughness fracture-resistant ion exchange glass with the depth of the compressive stress layer of 30 mu m meets the conditions that I CS30 is more than or equal to 68 and less than or equal to 132; The ICS30 is defined by the following relation (2): (2) Wherein, the Kc is the fracture toughness of the base material glass, and is more than or equal to 1.0 and less than or equal to 2.2; v is the poisson's ratio of the substrate glass; E is the elastic modulus of the base material glass, and E is more than or equal to 82 and less than or equal to GPa and less than or equal to 96 GPa; h is the Vickers hardness of the base material glass, and is more than or equal to 600 and less than or equal to 720; t is the thickness of the high-strength and high-toughness fracture-resistant ion exchange glass; y is the volume compression modulus of the high-strength and high-toughness fracture-resistant ion exchange glass, and is constant 0.8; CS30 is the corresponding compressive stress of the high-strength and high-toughness fracture-resistant ion exchange glass when the depth of the compressive stress layer is 30 mu m, and the stress is 110 MPa-220-MPa.
  2. 2. The high strength and toughness fracture-resistant ion exchange glass of claim 1, wherein the ion exchange glass has a drop height of greater than or equal to 180 cm.
  3. 3. The high strength and toughness fracture-resistant ion exchange glass according to claim 1, wherein the thickness t of the base glass satisfies 0.5 mm≤t≤2.0 mm.
  4. 4. The high strength and toughness fracture-resistant ion exchange glass according to claim 1, wherein the fracture-resistant elongation characteristic factor D of the ion exchange glass is 0.75-0.95, and the compressive stress storage compression energy I CS30 of the base material glass is 72- CS30 -122.
  5. 5. The high strength and toughness fracture-resistant ion exchange glass according to claim 4, wherein in the formulas (1) and (2): elastic modulus of the substrate glass E is more than or equal to 84 and less than or equal to 90 GPa; the fracture toughness Kc of the base material glass is more than or equal to 1.6 and less than or equal to 2.0; The Vickers hardness H of the base material glass meets the requirement that H is more than or equal to 665 and less than or equal to 690; The Poisson ratio of the substrate glass is more than or equal to 0.22 and less than or equal to 0.28; The compressive stress CS30 of the high-strength and high-toughness fracture-resistant ion exchange glass meets 150 MPa-190 MPa.
  6. 6. A substrate glass for use in the manufacture of the high strength and toughness fracture-resistant ion exchange glass of any one of claims 1-5, characterized in that it is borosilicate glass having a composition, on an oxide basis, in mass percent comprising: The mass percentage of SiO 2 is 61.8wt percent to 62.9wt percent; The mass percentage of Al 2 O 3 is 18.2wt percent to 20.2wt percent; The mass percentage of Na 2 O is 7.0wt percent to 7.2wt percent; the mass percentage of K 2 O is 1.0-wt wt% -1.7wt%; the mass percentage of MgO is 2.1-3.1 wt%; the mass percentage of Li 2 O is 4.3wt percent to 4.6wt percent; the mass percentage of ZrO 2 is 2.2wt percent to 3.4wt percent; The mass percentage of the B 2 O 3 is 0.2wt percent to 1.6wt percent.
  7. 7. The substrate glass of high strength and toughness fracture-resistant ion exchange glass according to claim 6, wherein the mass fraction between components in the composition of the substrate glass satisfies at least one of the following conditions: (1) 1.98 ≤ (SiO 2 + B 2 O 3 ) / Al 2 O 3 ≤ 3.52; (2) 4.21 ≤ (Li 2 O + Na 2 O + K 2 O) / ZrO 2 ≤ 5.95; (3) 5.14 ≤ (ZrO 2 + Al 2 O 3 ) / (MgO + B 2 O 3 ) ≤ 12.72。
  8. 8. The substrate glass of high strength and toughness fracture-resistant ion exchange glass according to claim 7, wherein the mass fraction between the components in the composition of the substrate glass satisfies both the conditions (1), (2) and (3).
  9. 9. A method of making the high strength, high toughness, fracture resistant ion exchange glass of any one of claims 1-5, comprising: Providing a substrate glass as defined in any one of claims 6-8; and carrying out chemical strengthening treatment on the base material glass to obtain the high-strength and high-toughness fracture-resistant ion exchange glass.
  10. 10. Use of the high strength and toughness fracture-resistant ion exchange glass according to any one of claims 1 to 5 for the preparation of mobile intelligent terminal covers, new energy automobile display panels or special protection windows.

Description

High-strength and high-toughness fracture-resistant ion exchange glass and preparation method and application thereof Technical Field The application relates to the field of reinforced glass, in particular to high-strength and high-toughness fracture-resistant ion exchange glass, and a preparation method and application thereof. Background The cover glass is used as a key component of products such as a mobile intelligent terminal (such as a smart phone, a tablet personal computer and wearable equipment), a new energy automobile display panel, a special protection window and the like, and the mechanical property of the cover glass directly influences the reliability and the service life of the equipment. In recent years, with the development trend of thinning and enlarging screen of electronic equipment, the thickness of cover glass is continuously reduced and the size is continuously increased, so that the mechanical stress and impact risk born by the cover glass in daily use are increased in multiple. Meanwhile, the diversification of the use scene (such as multi-angle drop, hard object scratch, repeated point pressing, extreme temperature difference and the like) of the user puts more stringent demands on the impact resistance, the damage resistance and the structural integrity of the glass material. At present, chemical strengthening (ion exchange) technology is commonly adopted in the industry to improve the mechanical properties of glass. The process effectively inhibits the expansion of surface microcracks by forming the compressive stress layer on the surface of the glass, thereby improving the strength and the shock resistance of the glass. However, conventional chemically strengthened glass has the following technical limitations: First, the prior art mostly focuses on optimization of a single parameter. For example, only higher values of surface compressive stress or simply increased depth of layer of compressive stress are sought. Such optimization strategies often result in limited performance improvement and even negative impact, such as excessive surface compressive stress can reduce glass toughness, and excessive deep compressive stress layers can affect thin designs. Second, conventional chemically strengthened glass lacks effective synergistic optimization between the various performance parameters. Intrinsic properties such as fracture toughness, elastic modulus, hardness and the like are mutually restricted with chemical strengthening parameters, and the whole performance breakthrough is difficult to realize by independently optimizing a certain parameter. Third, existing glass composition designs fail to adequately account for the synergistic effects between the components. The traditional glass composition lacks systematicness in the aspect of controlling the proportion of alkali metal oxide and reinforcing component, and is difficult to simultaneously meet multiple requirements of high toughness, high ion exchange efficiency and the like. Fourth, there is a lack of an evaluation index capable of accurately characterizing the comprehensive fracture resistance of glass. The prior single index is difficult to comprehensively reflect the damage resistance of the glass in the whole process from stress deformation to final fracture. Due to the limitations, the anti-falling height of the conventional chemically strengthened glass is only 1.1-1.2 meters at present, and the ever-increasing requirement of high-end application scenes on the protection performance cannot be met. Especially in the consumer electronics fields of smart phones, wearable devices and the like, the requirements of users on the anti-falling performance of the devices are generally increased to be more than 1.5 meters, and part of high-end applications even need to reach the anti-falling height of 1.8-2.0 meters. Disclosure of Invention In order to solve the problems, the application provides high-strength and high-toughness fracture-resistant ion exchange glass, and a preparation method and application thereof. The application adopts the following technical scheme: the application provides high-strength and high-toughness fracture-resistant ion exchange glass, which is obtained by a chemical strengthening process of base material glass, wherein the fracture-resistant flexural elongation characteristic factor D of the ion exchange glass is more than or equal to 0.68 and less than or equal to 1.44; the fracture resistance elongation characteristic factor D is defined by the following relation (1): (1) The compressive stress storage compression energy I CS30 of the high-strength and high-toughness fracture-resistant ion exchange glass with the depth of the compressive stress layer of 30 mu m meets the conditions that I CS30 is more than or equal to 68 and less than or equal to 132; The ICS30 is defined by the following relation (2): (2) Wherein, the Kc is the fracture toughness of the base material glass, and is more than o