Robust window for infrared energy
First Claim
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1. An article comprising:
- a substrate; and
a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface, the composite coating comprising a first phase and a second phase, the second phase having a higher resistance to erosive wear than the first phase;
wherein the coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition;
wherein the first phase has at least one property selected from the group consisting ofa) a coefficient of thermal expansion (CTE) that is within about plus or minus 3 parts per million per degree centigrade of a CTE of the substrate, andb) an index of refraction that is within a range from as high as about 0.1 plus the index of refraction of the substrate to as low as about the square root of the index of refraction of the substrate;
wherein the coating and the substrate are capable of transmitting infrared radiation.
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Abstract
Articles transparent to infrared radiation and resistant to impact and wear are provided. The article comprises a substrate and a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface. The composite coating comprises a first phase and a second phase. The second phase has a higher resistance to erosive wear than the first phase. The coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition.
26 Citations
23 Claims
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1. An article comprising:
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a substrate; and a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface, the composite coating comprising a first phase and a second phase, the second phase having a higher resistance to erosive wear than the first phase; wherein the coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition; wherein the first phase has at least one property selected from the group consisting of a) a coefficient of thermal expansion (CTE) that is within about plus or minus 3 parts per million per degree centigrade of a CTE of the substrate, and b) an index of refraction that is within a range from as high as about 0.1 plus the index of refraction of the substrate to as low as about the square root of the index of refraction of the substrate; wherein the coating and the substrate are capable of transmitting infrared radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An article comprising:
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a composite substrate comprising a matrix material and particles of a nano-dispersoid dispersed within the matrix material, wherein the particles of the nano-dispersoid are less than about 100 nm in at least one dimension; and a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface, the composite coating comprising a first phase and a second phase, the second phase having a higher resistance to erosive wear than the first phase; wherein the coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition; wherein the first phase comprises a material selected from the group consisting of magnesium aluminate spinel, yttrium aluminate garnet, cubic zirconium oxide, yttrium oxide, magnesium oxide, alpha aluminum oxide, aluminum oxynitride, and rare earth oxides; wherein the second phase comprises a material selected from the group consisting of cubic boron nitride, silicon carbide, silicon nitride, diamond-like carbon, diamond, and boron phosphide; wherein the coating and substrate together cause scattering of up to about 5 percent of incident infrared radiation. - View Dependent Claims (23)
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Specification