Chemically toughened flexible ultrathin glass
A chemically toughened ultrathin glass is provided. The glass has a thickness less than 500 μm and a surface compressive layer having a depth of at most 30 μm. The toughened ultrathin glass sheet is more flexible and has extraordinary thermal shock resistance with the glass being easier to handle for processing.
1. A glass article comprising a chemically toughened flexible ultrathin glass, said glass having a thickness less than 500 μm, a depth of ion exchange layer less than 30 μm achieved by controlling an ion exchange rate, a surface compressive stress between 100 MPa and 700 MPa, and a central tensile stress less than 120 MPa, wherein said thickness, depth of ion exchange layer, surface compressive stress, and central tensile stress meet the following relationship:
0.2
t
L
DoL
≤
σ
CS
σ
CT
wherein said glass is selected from the group consisting of
(A) a lithium aluminosilicate glass having a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
55-69
Al 2 O 3
18-25
Li 2 O
3-5
Na 2 O + K 2 O
0-30
MgO + CaO + SrO + BaO
0-5
ZnO
0-4
TiO 2
0-5
ZrO 2
0-5
TiO 2 + ZrO 2 + SnO 2
2-6
P 2 O 5
0-8
F
0-1
B 2 O 3
0-2
(B) an alkali metal aluminosilicate glass having a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
55-68
Al 2 O 3
10-27
B 2 O 3
0-15
Li 2 O + Na 2 O + K 2 O
4-27
MgO + CaO + SrO + BaO + ZnO
0-12
TiO 2 + ZrO 2
0-10
P 2 O 5
0-8
and
(C) a low alkali metal aluminosilicate glass having a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
50-75
Al 2 O 3
7-25
B 2 O 3
0-20
Li 2 O + Na 2 O + K 2 O
0-4
MgO + CaO + SrO + BaO + ZnO
5-25
TiO 2 + ZrO 2
0-10
P 2 O 5
0-5
wherein said glass has a Young's modulus less than 84 GPa, wherein said glass has a rigidity ε less than 33.5 GPa·cm3/g, and wherein said glass has a bending radius less than 150 mm.
2. The glass article according to claim 1 , wherein said ion exchange rate includes chemically toughening in a salt bath between 350-700° C. for 15 minutes to 48 hours.
3. The glass article according to claim 2 , wherein said glass either before or after chemical toughening has a property selected from the group consisting of a thermal shock parameter R higher than 190 W/m, a maximum thermal loading ΔT higher than 380° C., a resistance to temperature difference RTG higher than 50 K, a resistance to thermal shock RTS higher than 75 K, a CTE less than 9.5×10 −6 /K, and any combinations thereof.
4. The glass article according to claim 1 , wherein said lithium aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
57-66
Al 2 O 3
18-23
Li 2 O
3-5
Na 2 O + K 2 O
3-25
MgO + CaO + SrO + BaO
1-4
ZnO
0-4
TiO 2
0-4
ZrO 2
0-5
TiO 2 + ZrO 2 + SnO 2
2-6
P 2 O 5
0-7
F
0-1
B 2 O 3
0-2.
5. The glass article according to claim 1 , wherein said lithium aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
57-63
Al 2 O 3
18-22
Li 2 O
3.5-5
Na 2 O + K 2 O
5-20
MgO + CaO + SrO + BaO
0-5
ZnO
0-3
TiO 2
0-3
ZrO 2
0-5
TiO 2 + ZrO 2 + SnO 2
2-5
P 2 O 5
0-5
F
0-1
B 2 O 3
0-2.
6. The glass article according to claim 1 , wherein said alkali metal aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
50-70
Al 2 O 3
10-27
B 2 O 3
0-18
Li 2 O + Na 2 O + K 2 O
5-28
MgO + CaO + SrO + BaO + ZnO
0-13
TiO 2 + ZrO 2
0-13
P 2 O 5
0-9.
7. The glass article according to claim 1 , wherein said alkali metal aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
55-68
Al 2 O 3
10-27
B 2 O 3
0-15
Li 2 O + Na 2 O + K 2 O
4-27
MgO + CaO + SrO + BaO + ZnO
0-12
TiO 2 + ZrO 2
0-10
P 2 O 5
0-8.
8. The glass article according to claim 1 , wherein said low alkali metal aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
52-73
Al 2 O 3
7-23
B 2 O 3
0-18
Li 2 O + Na 2 O + K 2 O
0-4
MgO + CaO + SrO + BaO + ZnO
5-23
TiO 2 + ZrO 2
0-10
P 2 O 5
0-5.
9. The glass article according to claim 1 , wherein said low alkali metal aluminosilicate glass has a composition (in wt %) comprising:
Composition
(wt %)
SiO 2
53-71
Al 2 O 3
7-22
B 2 O 3
0-18
Li 2 O + Na 2 O + K 2 O
0-4
MgO + CaO + SrO + BaO + ZnO
5-22
TiO 2 + ZrO 2
0-8
P 2 O 5
0-5.
10. The glass article according to claim 1 , wherein said glass has a surface roughness less than 5 nm.
11. The glass article according to claim 1 , wherein said glass is glass sheet having a size that is greater than 100×100 mm 2 .
12. The glass article according to claim 1 , wherein said glass is a glass roll, said glass roll having a width greater than 250 mm and a spreading length is greater than 1 m.
13. The glass article according to claim 1 , further comprising a bendable non-ITO conductive coating with a thickness between 0.001 μm and 100 μm thereon such that the glass article is a conductive glass article.
14. The glass article according to claim 13 , wherein the conductive coating comprises a material selected from the group consisting of silver nano-wires, carbon nano-tubes, graphenes, poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS), polyacetylene, polyphenylene vinylene, polypyrrole, polythiophene, polyaniline, polyphenylene sulfide, and any mixtures thereof.
15. The glass article according to claim 13 , wherein the conductive coating has a Young's modulus less than or equal to 50 GPa, and wherein the glass article comprises an adjustable transmittance of 0-90%.
16. The glass article according to claim 13 , wherein the conductive coating has a sheet electric resistance less than 300 Ω/sq.
17. The glass article according to claim 1 , further comprising at least one surface treated to provide an anti-glare function such that the glass article is an anti-glare glass article.
18. The glass article according to claim 1 , further comprising at least one surface comprising Ag+ or Cu2+ ions such that the glass article is an anti-microbial glass article.
19. The glass article according to claim 18 , wherein the Ag+ or Cu2+ ions on the at least one surface have a concentration above 1 ppm.
20. The glass article according to claim 1 , wherein said glass before or after ion exchange comprises a laminate with a polymer material.
21. The glass article according to claim 20 , wherein said laminate has a WVTR of less than 5×10 −6 g/m2/day.
22. The glass article according to claim 20 , wherein said polymer material is selected from the group consisting of silicone polymer, sol-gel polymer, polycarbonate (PC), polyethersulphone, polyacrylate, polyimide (PI), cycloolefin copolymer, polyarylate, silicone resin, polyethylene, polypropylenepolyvinyl chloride, polystyrene, styrene-acrylonitrile copolymers, polymethyl methacrylate (PMMA), ethylene-vinyl acetate copolymers, polyethylene terephthalate (PET), polybutylene terephthalate, polyamide, polyacetal, polyphenyleneoxide, polyphenylenesulfide or polyurethanes, and any mixtures thereof.
23. The glass article according to claim 20 , wherein said laminate has a total thickness of less than 500 μm.
24. The glass article according to claim 20 , wherein said laminate has a ratio of said polymer materials to said glass of less than 200%.
25. The glass article according to claim 1 , wherein the glass article is configured for a use selected from the group consisting of a protective film for a resistive screen, a display screen, a cell phone, a laptop, a TV, a mirror, a window, an aviation widow, furniture, and a white home appliance.