	US 12,122,708 B2
	Mother glass, reinforced glass and preparation method
Wei Hu, Guangdong (CN); Baoquan Tan, Guangdong (CN); and Fanghua Chen, Guangdong (CN)
Assigned to Chongqing Aureavia Hi-tech Glass Co., Ltd., Chongqing (CN)
Appl. No. 16/959,139
Filed by Chongqing Aureavia Hi-tech Glass Co., Ltd., Chongqing (CN)
PCT Filed Jan. 31, 2018, PCT No. PCT/CN2018/074636 § 371(c)(1), (2) Date Jun. 29, 2020, PCT Pub. No. WO2019/127818, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 201711487372.1 (CN), filed on Dec. 29, 2017.
Prior Publication US 2020/0339471 A1, Oct. 29, 2020
Int. Cl. C03C 4/18 (2006.01); C03C 3/085 (2006.01); C03C 3/087 (2006.01); C03C 3/097 (2006.01); C03C 21/00 (2006.01)

CPC C03C 21/002 (2013.01) [C03C 3/085 (2013.01); C03C 3/087 (2013.01); C03C 3/097 (2013.01); C03C 4/18 (2013.01); C03C 21/005 (2013.01); C03C 2204/00 (2013.01)]

19 Claims

1. A reinforced glass which can bear a fracture energy larger than or equal to 74.67 joules per square meter (J/m²) when the reinforced glass is impacted and broken by an external force, and can bear a free fall fracture energy larger than or equal to 14.7 joules per kilogram (J/kg) under a certain negative pressure; wherein the reinforced glass is formed by a mother glass after a single time or multiple times of chemical strengthening, and the reinforced glass has a composite compressive stress layer on its surface;

wherein the composite compressive stress layer comprises a first ion which enters into the reinforced glass through a single time or multiple times of ion exchanges and is selected from an ion group of Na ion, K ion, Ru ion and CS ion, wherein a concentration of the first ion decreases nonlinearly from the surface of the reinforced glass to an interior of the reinforced glass; wherein a first fitting curve about the concentration of the first ion vs. a distance extending from the surface of the reinforced glass to the interior of the reinforced glass has at least one inflection point, wherein an absolute value of a curve slope on a left side of all the inflection points on the first fitting curve is greater than an absolute value of the curve slope on a right side of all the inflection points on the first fitting curve;

wherein a compressive stress of the composite compressive stress layer decreases nonlinearly from the surface of the reinforced glass to the interior of the reinforced glass, and the composite compressive stress layer has a compressive stress curve extending from the surface of the reinforced glass to the interior of the reinforced glass, wherein a second fitting curve having at least one inflection point is obtained from the compressive stress curve by using Orihara Pmc software; wherein an absolute value of a curve slope on a left side of all the inflection points on the second fitting curve is greater than an absolute value of the curve slope on a right side of all the inflection points on the second fitting curve;

wherein the compressive stress of the composite compressive stress layer has a maximum range between 600 MPa and 1100 MPa, and the composite compressive stress layer has a depth between 100 μm and 300 μm;

wherein the reinforced glass further has a tensile stress layer having a maximum tensile stress range between 42 MPa and 84 MPa, and the tensile stress stored in each unit volume of the reinforced glass is 20000-126000 MN/m³;

the reinforced glass has a thickness between 0.70 mm and 2.0 mm;

a ratio between an absolute value of a difference between sizes of the mother glass and the reinforced glass in a same dimension, and a size of the mother glass in the corresponding dimension is between 0.05% and 0.15%;

the reinforced glass formed by the mother glass after the ion exchanges under different conditions has different tensile stress layers, a range absolute value of a total tensile stress that can be accommodated in the reinforced glass is less than or equal to 42.08 kN/m and increases with the increase of the glass thickness;

wherein the mother glass has a thickness range of 0.4 mm-2.0 mm, a transmittance range for a 550 nm-wavelength light of 86%-92.2%, a refractive index range of 1.52-1.54, and an alkali metal oxide molar content range of 12 mol %-19 mol %, wherein in the mother glass, a Na oxide molar content is 11.0 mol %-12 mol %, an Al oxide molar content is 11 mol %˜15.5 mol %;

wherein in the mother glass, a Li oxide molar content is not higher than 7.7 mol %; wherein the Si oxide molar content is 58.00%-62.50%;

wherein in the mother glass, a ratio range between the Al oxide molar content and a sum of the Na oxide molar content and the Li oxide molar content is 0.82˜1.00;

wherein during the ion exchange process, an ion exchange layer depth of the mother glass increases with an extension of an ion exchange time, wherein a compression stress layer formed by the mother glass after the ion exchange has a maximum limit depth which increases with an increase of a thickness of the mother glass and has a maximum value of 300 μm.