Coated glass substrate or glass ceramic substrate with resistant multifunctional surface properties, method for production thereof, and use of thereof
The invention relates to a coated glass substrate or glass ceramic substrate with resistant, multi-functional surface properties, including a combination of anti-microbial, anti-reflective and anti-fingerprint properties, or a combination of anti-microbial, anti-reflective and anti-fingerprint properties where the substrate is chemically pre-stressed, or a combination of anti-microbial and anti-reflective properties where the substrate is chemically pre-stressed. The coated glass substrate or glass ceramic substrate exhibits a unique combination of functions which are permanently present and do not exert a negative effect on each other.
1 . A thin glass ceramic substrate with a thickness that is less than 1 mm, wherein the thin glass ceramic substrate comprises at least one of a lithium aluminosilicate glass ceramic or a ceramized aluminosilicate glass and the thin glass ceramic substrate comprises 3.2-5.0 weight-% Li 2 O and 0.2-2.0 weight-% sum Na 2 O and K 2 O, wherein the glass ceramic contains keatite mixed crystals as the predominant crystal phase and the keatite mixed crystals have a crystal size less than 70 nm, wherein the thin glass ceramic substrate comprises greater than 0 weight-% and up to 2 weight-% SrO and/or greater than 0 weight-% and up to 2.5 weight-% ZnO.
2 . The thin glass ceramic substrate according to claim 1 , wherein the thin glass ceramic substrate further comprises 15-25 weight-% Al 2 O 3 and 50-75 weight-% SiO 2 .
3 . The thin glass ceramic substrate according to claim 1 , wherein in the thin glass ceramic substrate, the following composition of a starting glass is used (in weight-%):
Li 2 O 3.2-5.0;
Na 2 O 0-1.5;
K 2 O 0-1.5;
Sum Na 2 O+K 2 O 0.2-2.0;
MgO 0.1-2.2;
CaO 0-1.5;
SrO 0-1.5;
BaO 0-2.5;
ZnO 0-1.5;
Al 2 O 3 19-25;
SiO 2 55-69;
TiO 2 1.0-5.0;
ZrO 2 1.0-2.5;
SnO 2 0-1.0;
Sum TiO 2 +ZrO 2 +SnO 2 2.5-5.0; and
P 2 O 5 0-3.0.
4 . The thin glass ceramic substrate according to claim 1 , wherein in the thin glass ceramic substrate or a ceramizable glass, the following composition of a starting glass is used (weight-%):
Li 2 O 3.2-4.5;
Na 2 O 0-1.5;
K 2 O 0-1.5;
Sum Na 2 O+K 2 O 0.2-2;
MgO 0-2;
CaO 0-1.5;
SrO 0-1.5;
BaO 0-2.5;
ZnO 0-2.5;
B 2 O 3 0-1;
Al 2 O 3 19-25;
SiO 2 55-69;
TiO 2 1.4-2.7;
ZrO 2 1.3-2.5;
SnO 2 0-0.4;
Sum TiO 2 +SnO 2 less than 2.7;
P 2 O 5 0-3; and
Sum ZrO 2 +0.87 (TiO 2 +SnO 2 ) 3.6-4.3.
5 . The thin glass ceramic substrate according to claim 1 , wherein in the thin glass ceramic substrate the following composition of a starting glass is used (in weight-%):
Li 2 O 3.2-5;
Na 2 O 0-1.5;
K 2 O 0-1.5;
Sum Na 2 O+K 2 O 0.2-2;
MgO 0.1-2.5;
CaO 0-2;
SrO 0-2;
BaO 0-3;
ZnO 0-1.5;
Al 2 O 3 15-25;
SiO 2 50-75;
TiO 2 1-5;
ZrO 2 1-2.5;
SnO 2 0-1.0;
Sum TiO 2 +ZrO 2 +SnO 2 2.5-5; and
P 2 O 5 0-3.0.
6 . The thin glass ceramic substrate according to claim 1 , wherein the thin glass ceramic substrate comprises a glass which is totally or partially crystallized.
7 . The thin glass ceramic substrate according to claim 1 , wherein the thin glass ceramic substrate comprises an amorphous phase and one or several crystalline phases that are produced through crystallization control.
8 . The thin glass ceramic substrate according to claim 1 , wherein the thin glass ceramic substrate has a crystalline phase of at least 30 vol-%.
9 . The thin glass ceramic substrate according to claim 1 , wherein a glass ceramic of the thin glass ceramic substrate is obtained through conversion of a glass by utilizing a thermal treatment.
10 . The thin glass ceramic substrate according to claim 9 , wherein the glass ceramic is transparent.
11 . The thin glass ceramic substrate according to claim 1 , further comprising:
a coating including at least one layer applied to said thin glass ceramic substrate to form a coated glass ceramic substrate, wherein said coated glass ceramic substrate displays a combination of antimicrobial and antireflective properties, wherein said coated glass ceramic substrate also satisfies at least one of the following:
said coated glass ceramic substrate also displays anti-fingerprint properties; or
said coated glass ceramic substrate is chemically prestressed.
12 . The thin glass ceramic substrate according to claim 11 , wherein the thin glass ceramic substrate incorporates at least one antimicrobially effective metal ion therein, said thin glass ceramic substrate is chemically prestressed and the chemical prestressing is produced through an ion exchange, and said coating includes an antireflective coating including at least one antireflective layer applied to said thin glass ceramic substrate and an anti-fingerprint coating including at least one anti-fingerprint layer applied to said at least one antireflective layer.
13 . The thin glass ceramic substrate according to claim 12 , wherein said at least one antireflective layer consists of:
one antireflective layer which is an adhesion promoting layer;
at least two antireflective layers with alternating high refractive index and low refractive index layers, wherein an uppermost layer is a low refractive index layer and an adhesion promoting layer; or
at least three antireflective layers with alternating medium refractive index, high refractive index, and low refractive index layers, wherein an uppermost layer is a low refractive index layer and an adhesion promoting layer.
14 . The thin glass ceramic substrate according to claim 13 , wherein said at least one antireflective layer satisfies one of the following:
said at least one antireflective layer consists of one antireflective layer and has a refractive index in a range of 1.22 to 1.44; or
said at least one antireflective layer includes a plurality of antireflective layers, said uppermost layer having a refractive index in the range of 1.22 to 1.70.
15 . The thin glass ceramic substrate according to claim 13 , wherein said antireflective coating comprises a plurality of antireflective layers and an uppermost layer is subdivided into at least one intermediate layer having the same refractive index as one or more layers between said uppermost layer and said thin glass ceramic substrate.
16 . The thin glass ceramic substrate according to claim 13 , wherein said adhesion promoting layer is a mixed oxide layer.
17 . The thin glass ceramic substrate according to claim 16 , wherein said mixed oxide layer is a silicon mixed oxide layer comprising an oxide of at least one of: aluminum, zinc, magnesium, phosphorus, cerium, zircon, titanium, cesium, barium, strontium, niobium, tin, boron, or magnesium fluoride and has a thickness greater than 1 nm.
18 . The thin glass ceramic substrate according to claim 12 , wherein said at least one antireflective layer is an incomplete antireflective layer, said incomplete antireflective layer being configured to only form a complete antireflective effect in a spectral range in combination with at least one of an adhesion promoting layer or said at least one anti-fingerprint layer.
19 . The thin glass ceramic substrate according to claim 11 , wherein said coated glass ceramic substrate also displays antiglare properties.
20 . The thin glass ceramic substrate according to claim 11 , wherein the coated glass ceramic substrate is chemically prestressed and has a transmission of greater than 93% over the wavelength range of 400 nm to 700 nm.
21 . A method for producing a thin glass ceramic substrate, the method comprising the following steps:
melting raw materials during a glass producing process at a temperature higher than 1000° C. in order to create a glass melt; and
in the glass melt after homogenization at a predetermined temperature after cooling, nucleation and crystallization is performed in order to produce the thin glass ceramic substrate with a homogenous structure with fine grains, wherein the thin glass ceramic substrate has a thickness that is less than 1 mm, wherein the thin glass ceramic substrate comprises at least one of a lithium aluminosilicate glass ceramic or a ceramized aluminosilicate glass and the thin glass ceramic substrate comprises 3.2-5.0 weight-% Li 2 O and 0.2-2.0 weight-% sum Na 2 O and K 2 O, wherein the glass ceramic contains keatite mixed crystals as the predominant crystal phase and the keatite mixed crystals have a crystal size less than 70 nm, wherein the thin glass ceramic substrate comprises greater than 0 weight-% and up to 2 weight-% SrO and/or greater than 0 weight-% and up to 2.5 weight-% ZnO.
22 . The method according to claim 21 , wherein a crystallization agent for crystallization is used, wherein a total amount of crystallization agent is at most 5 weight-% in relation to a total amount of the glass composition.