US 2026/0209105 A1 · TRANSPARENT COLORLESS SPINEL MICROCRYSTALLINE GLASS, AND PREPARATION AND USE THEREOF

Abstract

Provided are transparent colorless spinel microcrystalline glass, and preparation and use thereof. The microcrystalline glass contains (Zn, Mg) Al2O4 as a principal crystalline phase and ZrO2 as a secondary tetragonal crystalline phase, and does not contain TiO2. In mole percentage on an oxide basis, an oxide contained therein satisfies the following relational expressions: Al2O3/(MgO+ZnO)=1.40~2.00, and K2O+Li2O+Na2O+B2O3)/(SiO2+Al2O3)=0.10~0.20. The microcrystalline glass is obtained by performing heat treatment at a temperature of being not greater than 800° C. The microcrystalline glass has a transmittance of 85.0% or above for light having a wavelength of 550 nm. Anti-abrasive paper drop testing is performed on the microcrystalline glass by using 80-mesh abrasive paper, the average anti-abrasive paper drop height of the microcrystalline glass is greater than or equal to 1.00 m; the Vickers hardness is 800 kgf/mm2 or above, and the fracture toughness of the microcrystalline glass is 1.200 MPa·m1/2 or above.

Claims23

Dependent claims

A microcrystalline glass, wherein the microcrystalline glass contains a (Zn, Mg) Al2O4 as a principal crystalline phase and a tetragonal ZrO2 as a secondary crystalline phase;

and the microcrystalline glass contains following proportions of oxide components in terms of a molar percentage of oxides:
component
mol %
SiO2
38.00%~50.00%
Al2O3
25.00%~30.00%
MgO
4.00%~8.00%
ZnO
8.00%~14.00%
ZrO2
3.00%~5.00%
Li2O
3.00%~8.00%
(excluding 8.00 mol %);
and
the microcrystalline glass basically does not contain TiO2, wherein
a content of the oxide components of the microcrystalline glass satisfies following relational expressions:
Al
2
⁢
O
3
/
(
MgO
+
Z
⁢
n
⁢
O
)
=
1.4
∼
2.
;
(
1
)
(
K
2
⁢
O
+
L
⁢
i
2
⁢
O
+
N
⁢
a
2
⁢
O
+
B
2
⁢
O
3
)
/
(
Si
⁢
O
2
+
Al
2
⁢
O
3
)
=
0.1
∼
0.2
;
(
2
)
and
in the relational expressions, each oxide represents a mole percentage content of an oxide in the component.

88 more elements

A chemically strengthened microcrystalline glass, wherein the chemically strengthened microcrystalline glass comprises a compressive stress layer and a tensile stress layer;

the chemically strengthened microcrystalline glass contains a (Zn, Mg) Al2O4 as a principal crystalline phase and a tetragonal ZrO2 as a secondary crystalline phase;
and
in terms of a molar percentage of oxides, components of the tensile stress layer of the chemically strengthened microcrystalline glass contain:
component
mol %
SiO2
38.00%~50.00%
Al2O3
25.00%~30.00%
MgO
4.00%~8.00%
ZnO
8.00%~14.00%
ZrO2
3.00%~5.00%
Li2O
3.00%~8.00%;
and
the chemically strengthened microcrystalline glass basically does not contain TiO2, and the molar percentage of Li2O is not 8.00 mol %, wherein
in terms of a molar percentage of oxides, the components of the tensile stress layer of the chemically strengthened microcrystalline glass satisfy following relational expressions:
Al
2
⁢
O
3
/
(
MgO
+
Z
⁢
n
⁢
O
)
=
1.4
∼
2.
;
(
1
)
(
K
2
⁢
O
+
L
⁢
i
2
⁢
O
+
N
⁢
a
2
⁢
O
+
B
2
⁢
O
3
)
/
(
Si
⁢
O
2
+
Al
2
⁢
O
3
)
=
0.1
∼
0.2
;
(
2
)
and
in the relational expressions, each oxide represents a mole percentage content of an oxide in the components.

89 more elements

Dependencies are inferred from the claim text.

Transparent colorless spinel microcrystalline glass, and preparation and use thereof

Life of this patent

Transparent colorless spinel microcrystalline glass, and preparation and use thereof

Life of this patent

Abstract

Claims23