Thermal spray coating of porous nanostructured ceramic...

C - Chemistry – Metallurgy – 09 – D

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C09D 1/00 (2006.01) B05D 1/02 (2006.01) B05D 3/02 (2006.01) B05D 7/24 (2006.01) C23C 4/04 (2006.01) C23C 4/10 (2006.01) C23C 4/12 (2006.01)

Patent

CA 2648643

By engineering thermal spray parameters, such as temperature and velocity, and engineering feedstock powder size and morphology, ceramic coatings may be produced having desired mechanical and thermal properties. The ceramic thermal spray coating may have a microstructure having about 10-80 % by cross-sectional area of a particulate phase based on surface area of the coating, and the particulate phase is uniformly distributed throughout the coating. The particulate phase is an unmelted portion of the thermal sprayed feedstock, which is highly porous and may be produced by agglomerating nanoparticles of the ceramic. Such coatings can be applied as TBCs or as abradable coatings.

En jouant sur des paramètres de pulvérisation thermique, comme la température et la vitesse, et en jouant sur la taille de poudre et la morphologie de la charge de départ, on peut obtenir des revêtements céramiques présentant des propriétés mécaniques et thermiques désirées. L'enduction par pulvérisation thermique céramique peut avoir une microstructure d'environ 10-80 % en zone transversale d'une phase particulaire sur la base de la superficie du revêtement, et la phase particulaire est répartie de manière uniforme sur tout le revêtement. La phase particulaire est une partie non fondue de la charge de départ déposée par pulvérisation thermique, qui est extrêmement poreuse et peut s'obtenir en agglomérant des nanoparticules de la céramique. De tels revêtements peuvent s'appliquer sous forme de TBC ou comme revêtements sensibles à l'abrasion.

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