The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2000
Filed:
Aug. 03, 1998
David S Rickerby, Derby, GB;
Rolls-Royce, PLC, London, GB;
Abstract
A metallic article includes a bond coating and a ceramic thermal barrier coating on the bond coating. The ceramic thermal barrier coating includes a plurality of columnar grains extending substantially perpendicularly to the surface of the metallic article. Each columnar gain has a plurality of first layers, a plurality of second layers and a plurality of third layers. The first layers have a different structure from the second layers and the third layers. The second layers have a different structure from the third layers. The first layers have the same composition as the third layers. The second layers have a greater proportion of voids than the first layers and the third layers. The voids reduce the thermal conductivity of the thermal barrier coating. The second layers may also have a different composition from the first layers and the third layers to reduce the thermal conductivity.