阅读说明：本技术 在玻璃中获得应力分布的方法 (Method for obtaining stress distribution in glass ) 是由 D·C·埃兰 郭晓菊 胡广立 彭高柱 于 2014-11-17 设计创作，主要内容包括：本申请涉及在玻璃中获得应力分布的方法以及用于为化学强化玻璃产生各种应力分布的方法。使碱金属铝硅酸盐玻璃接触离子交换介质,例如包含比玻璃中碱金属阳离子更大的碱金属阳离子的熔盐浴。在大于约420℃且在玻璃退火点以下至少约30℃的温度下实施离子交换。(The present application relates to methods of obtaining stress distributions in glass and methods for producing various stress distributions for chemically strengthened glass. The alkali aluminosilicate glass is contacted with an ion exchange medium, such as a molten salt bath containing alkali cations that are larger than the alkali cations in the glass. The ion exchange is performed at a temperature greater than about 420 ℃ and at least about 30 ℃ below the glass anneal point.)

1. A method of strengthening an alkali aluminosilicate glass comprising a first metal cation, wherein the first metal cation is a sodium cation, and wherein the alkali aluminosilicate glass has an annealing point, the method comprising:

a. immersing an alkali aluminosilicate glass in a molten salt bath comprising at least one salt of a second metal, wherein the second metal has a larger cation than the first metal cation;

b. ion exchanging a first metal cation in an alkali aluminosilicate glass with a cation of a second metal from a molten salt bath at a temperature greater than 420 ℃ and at least 30 ℃ below the annealing point for a period of time from 0.5 hours to 8 hours, wherein the ion exchanging forms a region of compressive stress extending from a surface of the glass into the glass to a depth of layer of at least 40 μ ι η, and wherein the compressive stress at the first depth is at least 70% of the compressive stress at the surface, wherein the compressive stress at the first depth is less than the compressive stress at the surface, the first depth is from about 30% to about 70% of the depth of layer, and the compressive stress at the first depth is a local maximum.

2. The method of claim 1, wherein the compressive stress at the first depth is at least about 350 MPa.

3. The method of any one of the preceding claims, wherein the molten salt bath further comprises up to 10 wt% of at least one sodium salt.

4. The method of any preceding claim, wherein the alkali aluminosilicate glass has a retained strength of at least 200 MPa.

5. The method of any one of the preceding claims, further comprising:

a. immersing an alkali aluminosilicate glass in a second molten salt bath comprising at least one salt of a second metal or at least one salt of a third metal, wherein the third metal has a larger cation than the cations of the first metal and the second metal; and

b. ion-exchanging a first metal cation in the alkali aluminosilicate glass with a cation of a second metal from a second molten salt bath at a temperature of less than or equal to 420 ℃, wherein a surface compressive stress formed by the ion-exchange in the second molten salt bath produces a maximum compressive stress at the surface; or

c. At a temperature greater than 420 ℃ and at least 30 ℃ below the annealing point, ion exchanging at least one of a cation of the first metal and a cation of the second metal in the alkali aluminosilicate glass with a cation of the third metal from the second molten salt bath, wherein the ion exchange in the second molten salt bath forms a surface region comprising the cation of the third metal.

6. An alkali aluminosilicate glass article having a region under compressive stress extending from a surface of the alkali aluminosilicate glass article to a depth of layer of at least 40 μ ι η in the alkali aluminosilicate glass article, wherein the alkali aluminosilicate glass article has a compressive stress at the surface and a first compressive stress at a first depth, the first depth being 30% to 70% of the depth of layer, wherein the first compressive stress is at least 70% of the compressive stress at the surface, the compressive stress at the first depth is less than the compressive stress at the surface, and the compressive stress at the first depth is a local maximum.

7. The alkali aluminosilicate glass article according to claim 6, wherein the alkali aluminosilicate glass article has a thickness of up to 1.5 mm.

8. The alkali aluminosilicate glass article of claim 6 or claim 7, wherein the compressive stress at the first depth is at least about 350 MPa.

9. The alkali aluminosilicate glass article of any one of claims 6-8, wherein the alkali aluminosilicate glass article has a retained strength of at least 200 MPa.

10. The alkali aluminosilicate glass article of any one of claims 6-9, wherein the alkali aluminosilicate glass article comprises:

a.50 mol% SiO₂And at least 11 mol% Na₂O，Al₂O₃And B₂O₃、K₂O, MgO and ZnO, wherein-340 + 27.1. Al₂O₃–28.7·B₂O₃+15.6·Na₂O–61.4·K₂O +8.1 · (MgO + ZnO) ≥ 0 mol%, and wherein the compressive stress at the surface is at least 900MPa, wherein the alkali aluminosilicate glass article further comprises; or

b. At least 50 mol% SiO₂(ii) a 9 to 22 mol% Al₂O₃(ii) a 3 to 10 mol% B₂O₃(ii) a 9 to 20 mol% Na₂O; 0 mol% to 5 mol% K₂O; and at least 0.1 mol% MgO, ZnO or a combination thereof, wherein MgO is greater than or equal to 0 and less than or equal to 6 and ZnO is greater than or equal to 0 and less than or equal to 6 mol%; and optionally at least one of CaO, BaO and SrO, wherein the CaO, the SrO and the BaO are more than or equal to 0 mol% and less than or equal to 2 mol%; or

c. At least 50 mol% SiO₂(ii) a At least 10 mol% R₂O, wherein R₂O comprises Na₂O；Al₂O₃And B₂O₃Wherein-0.5 mol% or less of Al₂O₃(mol%) -R₂O (mol%) is less than or equal to 2 mol% and B₂O₃(mol%) - (R)₂O (mol%) -Al₂O₃(mol%)) is more than or equal to 4.5 mol%; and B₂O₃Wherein B is₂O₃(mol%) - (R)₂O (mol%) -Al₂O₃(mole%)) greater than or equal to 4.5 mole%, and wherein the alkali aluminosilicate glass article has a zircon breakdown temperature equal to a temperature at which the viscosity of the glass is greater than 40 kpoise; or

d. At least 4 mol% P₂O₅Wherein (M)₂O₃(mol%)/R_xO (mol%)<1, wherein M₂O₃＝Al₂O₃+B₂O₃And wherein R_xO is the sum of the monovalent and divalent cation oxides present in the alkali aluminosilicate glass article.