US2012251743A1PendingUtilityA1
Durable glass housings/enclosures for electronic devices
Est. expiryAug 21, 2028(~2.1 yrs left)· nominal 20-yr term from priority
C03C 8/00C03C 4/00C03C 3/091C03C 3/083Y10T428/265C03C 3/087Y10T428/24355C03C 21/002Y10T428/131C03C 3/093
49
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Claims
Abstract
A housing/enclosure/cover can include an ion-exchanged glass exhibiting the following attributes (1) radio, and microwave frequency transparency, as defined by a loss tangent of less than 0.03 and at a frequency range of between 15 MHz to 3.0 GHz; (2) infrared transparency; (3) a fracture toughness of greater than 0.6 MPa·m 1/2 ; (4) a 4-point bend strength of greater than 350 MPa; (5) a Vickers hardness of at least 450 kgf/mm 2 and a Vickers median/radial crack initiation threshold of at least 5 kgf; (6) a Young's Modulus ranging between about 50 to 100 GPa;; (7) a thermal conductivity of less than 2.0 W/m° C., and (9) and at least one of the following attributes: (i) a compressive surface layer having a depth of layer (DOL) greater and a compressive stress greater than 400 MPa, or, (ii) a central tension of more than 20 MPa.
Claims
exact text as granted — not AI-modified1 . An article suitable for housing, enclosing, or covering the components of a portable electronic device, the article comprising:
an ion exchanged glass exhibiting:
radio and microwave frequency transparency, as defined by a loss tangent of less than 0.03 and at a frequency range of between 15 MHz to 3.0 GHz;
infrared transparency;
a fracture toughness of greater than 0.60 MPa·m 1/2 ;
a 4-point bend strength of greater than 350 MPa
a Vickers hardness of at least 450 kgf/mm 2 ;
a Vickers median/radial crack initiation threshold of at least 5 kgf;
a Young's Modulus ranging between 50 to 100 GPa;
a thermal conductivity of less than 2.0 W/m° C.; and
at least one of the following attributes:
(i) a compressive surface layer having a depth of layer (DOL) greater than or equal to 20 μm and a compressive stress greater than 400 MPa; or
(ii) a central tension of more than 20 MPa.
2 . The article of claim 1 , wherein the glass exhibits a refractive index of greater than 1.47 at 633 nm.
3 . The article of claim 1 , wherein the glass exhibits radio and microwave frequency transparency, as defined by a loss tangent of less than 0.015 at a frequency range of between 500 MHz to 3.0 GHz.
4 . The article of claim 1 , wherein the glass exhibits a fracture toughness of greater than 0.75 MPa·m 1/2 .
5 . The article of claim 1 , wherein the glass exhibits a Young's Modulus ranging between 50 and 75 GPa.
6 . The article of claim 1 , wherein the glass exhibits an 4-point bend strength of greater than 475 MPa.
7 . The article of claim 1 , wherein the glass exhibits a Vickers hardness of at least 500 kgf/mm 2 and Vickers median/radial crack initiation threshold of greater than 10 kgf.
8 . The article of claim 1 , wherein the glass exhibits a thermal conductivity of less than 1.5 W/m° C.
9 . The article of claim 1 , wherein the glass article is transparent and exhibits at least one surface having a Ra roughness of less than 50 nm.
10 . The article of claim 1 , wherein the glass article appears opaque and exhibits at least one surface having a Ra roughness of between 50 nm and 15 μm.
11 . The article of claim 1 , wherein the glass exhibits a near-infrared transparency of greater than 80% at a wavelength ranging from 750 to 2000 nm.
12 . The article of claim 1 , wherein the article exhibits an overall thickness of 1.2 mm and compressive layer exhibiting a DOL of ranging between 40 to 80 μm and the compressive layer exhibits a compressive stress of 525 MPa.
13 . The article of claim 1 , wherein the glass is an alkali-aluminosilicate glass.
14 . The article of claim 13 , wherein the alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 40-80% SiO 2 , 0-28% Al 2 O 3 , 0-8% B 2 O 3 , 0-18% Li 2 O, 0-10% Na 2 O, 0-11% K 2 O, 0-16% MgO, 0-18% CaO, 0-15% CaF 2 , 0-20% SrO, 0-12% BaO, 0-8% ZnO, 0-4% P 2 O 5 , 0-8% TiO 2 , 0-5% ZrO 2 , 0-1% SnO 2 , 0-1% Sb 2 O 3 , and 0-1% As 2 O 3 .
15 . The article of claim 13 , wherein the alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 60-70% SiO 2 ; 6-14% Al 2 O 3 ; 0-15% B 2 O 3 ; 0-15% Li 2 O; 0-20% Na 2 O; 0-10% K 2 O; 0-8% MgO; 0-10% CaO; 0-5% ZrO 2 ; 0-1% SnO 2 ; 0-1% CeO 2 ; less than 50 ppm As 2 O 3 ; and less than 50 ppm Sb 2 O 3 ; wherein 12 mol %≦Li 2 O+Na 2 O+K 2 O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %.
16 . The article of claim 13 , wherein the alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 61-75% SiO 2 , 7-15% Al 2 O 3 , 0-12% B 2 O 3 , 9-21% Na 2 O, 0-4% K 2 O, 0-7% MgO, and 0-3% CaO.
17 . The article of claim 13 , wherein the alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 60-72% SiO 2 ; 9-16% Al 2 O 3 ; 5-12% B 2 O 3 ; 8-16% Na 2 O;
and 0-4% K 2 O; wherein
Al
2
O
3
(
mol
%
)
+
B
2
O
(
mol
%
)
∑
alkali
metal
modifiers
(
mol
%
)
>
1.
18 . An article suitable for housing, enclosing, or covering the components of a portable electronic device, the article comprising:
an ion exchanged alkali-aluminosilicate glass exhibiting:
radio and microwave frequency transparency, as defined by a loss tangent of less than 0.03 and at a frequency range of between 15 MHz to 3.0 GHz;
infrared transparency;
a fracture toughness of greater than 0.60 MPa·m 1/2 ;
a 4-point bend strength of greater than 350 MPa;
a Vickers hardness of at least 450 kgf/mm 2 ;
a Vickers median/radial crack initiation threshold of at least 5 kgf;
a Young's Modulus ranging between 50 to 100 GPa;
a thermal conductivity of less than 2.0 W/m° C.; and
at least one of the following attributes:
(i) a compressive surface layer having a depth of layer (DOL) greater than or equal to 20 μm and a compressive stress greater than 400 MPa; or
(ii) a central tension of more than 20 MPa;
wherein the ion exchanged alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 61-75% SiO 2 , 7-15% Al 2 O 3 , 0-12% B 2 O 3 , 9-21% Na 2 O, 0-4% K 2 O, 0-7% MgO, and 0-3% CaO; and wherein the glass article is transparent and exhibits at least one surface having a Ra roughness of less than 50 nm.
19 . An article suitable for housing, enclosing, or covering the components of a portable electronic device, the article comprising:
an ion exchanged alkali-aluminosilicate glass exhibiting:
radio and microwave frequency transparency, as defined by a loss tangent of less than 0.03 and at a frequency range of between 15 MHz to 3.0 GHz;
infrared transparency;
a fracture toughness of greater than 0.60 MPa·m 1/2 ;
a 4-point bend strength of greater than 350 MPa;
a Vickers hardness of at least 450 kgf/mm 2 ;
a Vickers median/radial crack initiation threshold of at least 5 kgf;
a Young's Modulus ranging between 50 to 100 GPa;
a thermal conductivity of less than 2.0 W/m° C.; and
at least one of the following attributes:
(i) a compressive surface layer having a depth of layer (DOL) greater than or equal to 20 μm and a compressive stress greater than 400 MPa; or
(ii) a central tension of more than 20 MPa;
wherein the alkali-aluminosilicate glass comprises in mole percent as oxides on a batched basis: 60-72% SiO2; 9-16% Al203; 5-12% B2O3; 8-16% Na2O; and 0-4% K2O; wherein
Al
2
O
3
(
mol
%
)
+
B
2
O
(
mol
%
)
∑
alkali
metal
modifiers
(
mol
%
)
>
1
;
and
wherein the glass article is transparent and exhibits at least one surface having a Ra roughness of less than 50 nm.Join the waitlist — get patent alerts
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