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(11) | EP 2 309 024 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Process of forming a coating system, coating system formed thereby, and components coated therewith |
(57) A process by which a ceramic coating (14) is entirely formed from a colloidal-based
process to have a thickness that would ordinarily be prone to cracks and spallation
involves forming a precursor primer layer on a surface region (12,16,18), and then
forming at least a precursor coating layer on the precursor primer layer that is thicker
than the precursor primer layer. The precursor primer layer contains particles and
a precursor of a first ceramic material. The precursor coating layer contains particles
and a precursor of a second ceramic material having the same predominant constituent
as the first ceramic material. The precursor primer layer and precursor coating layer
are then heated to form a ceramic film (20) and a ceramic coating layer (14), respectively,
which consist essentially of the particles and matrices of, respectively, the first
and second ceramic materials.
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