Reflective coatings to reduce radiation heat transfer
AssigneeUnited Technologies Corporation
InventorsWilliam P. Allen, William A. Veronesi, Robert J. Hall, Michael J. Maloney, John W. Appleby, Douglas C. Hague, Abdus Khan
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Abstract
The present invention relates to a method for forming an article having a protective ceramic coating which reduces radiation heat transport through the ceramic coating. The protective ceramic coating includes one or more embedded reflective metallic layers for reducing the radiation heat transport. The method for forming the protective coating broadly comprises the steps of forming a ceramic coating on a substrate and embedding at least one reflective metallic layer within the ceramic coating.
Claims23
An article which comprises:
- a substrate formed from a metallic material selected from the group consisting of nickel-based alloys, iron-based alloys, cobalt-based alloys, and mixtures thereof;
- a ceramic coating formed on and contacting a surface of said substrate;
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport;
- and
- said at least one reflective metallic layer having a thickness sufficient to be opaque to radiation.
An article which comprises:
- a substrate formed from a metallic material selected from the group consisting of nickel-based alloys, iron-based alloys, cobalt-based alloys, and mixtures thereof;
- a ceramic coating formed on said substrate;
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport;
- said at least one reflective metallic layer having a thickness sufficient to be opaque to radiation;
- said ceramic coating comprising a thermal barrier coating;
- a bond coat intermediate said substrate and said thermal barrier coating;
- and
- said thermal barrier coating comprising a yttria-stabilized zirconia coating.
An article which comprises:
- a substrate;
- said substrate being selected from the group consisting of nickel-based alloys, iron-based alloys, cobalt-based alloys, and mixtures thereof;
- a ceramic coating formed on and in contact with a surface of said substrate;
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport;
- and
- said at least one reflective metallic layer having an emissivity less than 0.5.
An article which comprises:
- a substrate;
- said substrate being selected from the group consisting of nickel-based alloys, iron-based alloys, cobalt-based alloys, and mixtures thereof;
- a ceramic coating formed on said substrate;
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport;
- said at least one reflective metallic layer having an emissivity less than 0.5;
- said ceramic coating comprising a thermal barrier coating;
- a bond coat intermediate said substrate and said thermal barrier coating;
- and
- said thermal barrier coating comprising a yttria-stabilized zirconia coating.
A turbine component comprising:
- a substrate formed from a metallic material selected from the group consisting of nickel-based alloys, iron-based alloys, cobalt based alloys, and mixtures thereof;
- a ceramic coating formed on and in contact with a surface of said substrate;
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport;
- and
- said at least one reflective metallic layer having a thickness sufficient to be opaque to radiation and an emissivity less than 0.5.
An article comprising:
- a substrate formed from a ceramic material;
- a ceramic coating formed on said substrate;
- said ceramic coating comprising a thermal barrier coating formed from a yttria-stabilized zirconia coating;
- and
- at least one reflective metallic layer embedded within said ceramic coating to reduce radiation heat transport.
Dependencies are inferred from the claim text.