Fracture-Resistant Layered-Substrates and Articles Including the Same
First Claim
1. A layered-substrate comprising:
- a substrate comprising an outwardly-facing surface; and
a layer disposed on the outwardly-facing surface, wherein the layered-substrate exhibits a hardness of at least about 12 GPa, as measured by the Berkovitch Indenter Hardness Test, along an indentation depth of about 100 nm or greater and wherein the layered-substrate is able to withstand fracture when assembled in a device and the device is dropped from a height of at least 100 cm onto a drop surface.
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Abstract
Embodiments of a layered-substrate comprising a substrate and a layer disposed thereon, wherein the layered-substrate is able to withstand fracture when assembled with a device that is dropped from a height of at least 100 cm onto a drop surface, are disclosed. The layered-substrate may exhibit a hardness of at least about 10 GPa or at least about 20 GPa. The substrate may include an amorphous substrate or a crystalline substrate. Examples of amorphous substrates include glass, which is optionally chemically strengthened. Examples of crystalline substrates include single crystal substrates (e.g. sapphire) and glass ceramics. Articles and/or devices including such layered-substrate and methods for making such devices are also disclosed.
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Citations
20 Claims
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1. A layered-substrate comprising:
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a substrate comprising an outwardly-facing surface; and a layer disposed on the outwardly-facing surface, wherein the layered-substrate exhibits a hardness of at least about 12 GPa, as measured by the Berkovitch Indenter Hardness Test, along an indentation depth of about 100 nm or greater and wherein the layered-substrate is able to withstand fracture when assembled in a device and the device is dropped from a height of at least 100 cm onto a drop surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fracture-resistant article comprising:
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a substrate comprising opposing major surfaces; and a layer disposed on a first opposing major surface of the substrate, wherein the article exhibits a hardness of at least about 10 GPa as measured by a Berkovitch Indenter Hardness Test along an indentation depth of about 100 nm or greater, and is able to withstand fracture when assembled with a device that is dropped in a drop test from a height of at least 100 cm onto a drop surface. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A portable device comprising:
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a substrate having a major surface providing a user interface and having an initial scratch resistance and an initial impact resistance; and a layer on the major surface forming a layered-substrate exhibiting an enhanced scratch resistance and enhanced impact resistance, wherein the enhanced impact resistance comprises an average flexural strength after abrading the layered-substrate that is at least 80% of an average flexural strength before abrading the layered-substrate, and wherein said enhanced scratch resistance comprises a hardness of at least about 10 GPa, as measured by a Berkovitch Indenter Hardness Test, along an indentation depth of about 100 nm or greater.
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20. A device comprising:
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a substrate comprising opposing major surfaces; and a layer disposed on a first opposing major surface of the substrate to form a layered-substrate, wherein the layered-substrate is able to withstand fracture when the device is dropped from a height of at least 100 cm onto a drop surface.
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Specification