Scratch-resistant articles with retained optical properties
First Claim
Patent Images
1. A transparent article comprising:
- a substrate having opposing major surfaces; and
an optical film structure disposed on a first major surface of the substrate forming a front face,wherein the article comprisesa maximum hardness of about 12 GPa or greater, as measured on the front face by a Berkovich Indenter Hardness Test along an indentation depth from about 200 nm to about 600 nm, andeither one or both of;
article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, andarticle reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the reflectance color coordinates of the substrate,wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √
(a*article−
a*substrate)2+(b*article−
b*substrate)2), andwherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √
(a*article)2+(b*article)2),wherein the article comprises an average transmittance of 85% or more, over the visible spectrum as measured at the front face.
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Abstract
One or more aspects of the disclosure pertain to an article including an optical film structure disposed on a substrate, which may include a strengthened or non-strengthened substrate that may be amorphous or crystalline, such that the article exhibits scratch resistance and retains the same or improved optical properties as the substrate, without the optical film structure disposed thereon. In one or more embodiments, the article exhibits an average transmittance of 85% or more, over the visible spectrum (e.g., 380 nm-780 nm). Embodiments of the optical film structure include aluminum-containing oxides, aluminum-containing oxy-nitrides, aluminum-containing nitrides (e.g., AlN) and combinations thereof. The optical film structures disclosed herein also include a transparent dielectric including oxides such as silicon oxide, germanium oxide, aluminum oxide and a combination thereof. Methods of forming such articles are also provided.
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Citations
35 Claims
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1. A transparent article comprising:
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a substrate having opposing major surfaces; and an optical film structure disposed on a first major surface of the substrate forming a front face, wherein the article comprises a maximum hardness of about 12 GPa or greater, as measured on the front face by a Berkovich Indenter Hardness Test along an indentation depth from about 200 nm to about 600 nm, and either one or both of; article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, and article reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the reflectance color coordinates of the substrate, wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √
(a*article−
a*substrate)2+(b*article−
b*substrate)2), andwherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √
(a*article)2+(b*article)2),wherein the article comprises an average transmittance of 85% or more, over the visible spectrum as measured at the front face. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 30, 31)
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18. An article comprising:
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a substrate having opposing major surfaces; and an optical film structure disposed on a first major surface of the substrate forming a front face, the optical film structure comprising a first layer having a thickness of at least about 1 μ
m and comprising an aluminum-containing nitride, an aluminum-containing oxy-nitride, an aluminum-containing oxide or a combination thereof, and a second layer disposed on the first layer,wherein the article comprises a maximum hardness of 12 GPa or greater as measured on the front face by the Berkovich Indenter Hardness Test along an indentation depth from about 200 nm to about 600 nm, and wherein the article comprises an average transmittance of 85% or more over the visible spectrum, wherein the article comprises at least one of; article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence comprising a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, and article reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence comprising a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the reflectance color coordinates of the substrate, and wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √
((a*article−
a*substrate)2+(b*article−
b*substrate)2), andwherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √
((a*article)2+(b*article)2). - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 32, 33)
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26. A transparent article comprising:
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a substrate having opposing major surfaces; and an optical film structure disposed on a first major surface of the substrate forming a front face, wherein the article comprises a maximum hardness of 12 GPa or greater as measured on the front face by the Berkovich Indenter Hardness Test along an indentation depth from about 200 nm to about 600 nm or greater, and wherein the article comprises either one or both of; article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, and article reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the reflectance color coordinates of the substrate, wherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √
((a*articie−
a*substrate)2+(b*article−
b*substrate)2), andwherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √
(a*article)2+(b*article)2), andwherein the article comprises an abrasion resistance comprising any one or more of; about 5% haze or less, as measured using a hazemeter having an aperture, wherein the aperture has a diameter of about 8 mm, and a scattered light intensity of about 0.1 (in units of 1/steradian) or less, at a polar scattering angle in the range from about 15 degrees to about 60 degrees, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength, wherein the abrasion resistance is measured after a 500-cycle abrasion on the front face using a Taber Test, and wherein the article comprises an average transmittance of 85% or more, over the visible spectrum as measured at the front face. - View Dependent Claims (27, 28, 29, 34, 35)
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Specification
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Current AssigneeCorning Incorporated
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Original AssigneeCorning Incorporated
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InventorsPrice, James Joseph, Koch, III, Karl William, Paulson, Charles Andrew
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Primary Examiner(s)Austin, Aaron
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Assistant Examiner(s)ZHANG, MICHAEL N
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Application NumberUS14/481,221Publication NumberTime in Patent Office1,015 DaysField of Search428402, 428426, 428409, 428430, 428688, 428689, 428432, 428697, 428699, 428702, 428704US Class CurrentCPC Class CodesC03C 17/3435 comprising a nitride, oxyni...C03C 21/002 to perform ion-exchange bet...C03C 2217/78 Coatings specially designed...C03C 2217/91 Coatings containing at leas...C03C 3/091 containing aluminiumC23C 14/0036 Reactive sputteringC23C 14/0084 Producing gradient composit...C23C 14/0641 Nitrides C23C14/0617 takes ...C23C 14/0676 OxynitridesC23C 14/081 of aluminium, magnesium or ...C23C 14/10 Glass or silicaG02B 1/14 Protective coatings, e.g. h...G02B 5/22 Absorbing filters G02B5/201...G02B 5/26 Reflecting filters G02B5/28...Y10T 428/2495 Thickness [relative or abso...Y10T 428/26 Web or sheet containing str...
