Temperature dependent transparent optical coatings for high temperature reflection
First Claim
1. A component for use in an elevated temperature environment having temperature dependent reflectivity comprising:
- a substrate having an optically reflective surface; and
a coating disposed over and in contact with the optically reflective surface of the substrate, wherein the coating has a glass transition temperature, the coating having a transparency to incident radiation of less than about 50% below the coating glass transition temperature and greater than about 50% above the coating glass transition temperature, whereby below the glass transition temperature the component absorbs incident radiation and converts it to heat and above the glass transition temperature, the component reflects incident radiation from the optically reflective surface of the substrate.
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Accused Products
Abstract
A gas turbine engine component having a coating with a temperature dependent transparency is disclosed. The component includes a substrate having an optically reflective surface and a coating disposed over the substrate that has a transparency that is temperature dependent. At temperatures below the glass transition temperature, the coating has a low transparency to incident radiation, while at higher temperatures, the coating has a high transparency to incident radiation. As a result of the increased transparency at high temperatures, incident radiation passes through the coating and is reflected off of the optically reflective surface of the substrate underlying the coating. At low temperatures, when the coating has a low transparency, incident radiation is absorbed by the component, resulting in lower reflectivity.
18 Citations
27 Claims
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1. A component for use in an elevated temperature environment having temperature dependent reflectivity comprising:
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a substrate having an optically reflective surface; and
a coating disposed over and in contact with the optically reflective surface of the substrate, wherein the coating has a glass transition temperature, the coating having a transparency to incident radiation of less than about 50% below the coating glass transition temperature and greater than about 50% above the coating glass transition temperature, whereby below the glass transition temperature the component absorbs incident radiation and converts it to heat and above the glass transition temperature, the component reflects incident radiation from the optically reflective surface of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A gas turbine engine component having temperature dependent reflectivity comprising:
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a substrate having an optically reflective surface; and
a coating disposed over and in contact with the optically reflective surface of the substrate, wherein the coating comprises a material having a glass transition temperature and wherein the coating has a transparency to incident radiation of less than 50% below the glass transition temperature and a transparency to incident radiation of at least about 90% at temperatures above the glass transition temperature. - View Dependent Claims (15, 16)
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17. A method for optically tailoring a surface of a gas turbine engine component to control heat transfer comprising the steps of:
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providing a component of a gas turbine engine having an optically reflective surface;
coating the optically reflective surface of the component with a material having a glass transition temperature, wherein the material has a higher transparency to incident radiation above the glass transition temperature than below the glass transition temperature; and
providing cooling to a surface of the component opposite the optically reflective surface. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A gas turbine engine component having temperature dependent reflectivity comprising:
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a substrate;
a thermal barrier coating system overlying and in contact with a first surface of the substrate, the thermal barrier coating system comprising a bond coat, the bond coat in contact with the substrate and a ceramic coat overlying the bond coat;
a layer of optically reflective material overlying and in contact with the thermal barrier coating system; and
a coating disposed over and in contact with the layer of optically reflective material, wherein the coating comprises a material having a glass transition temperature and wherein the coating has a transparency to incident radiation of less than 50% below the glass transition temperature and a transparency to incident radiation of at least about 95% at temperatures at or above the glass transition temperature. - View Dependent Claims (26, 27)
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Specification