Heat barrier composition, a mechanical superalloy article provided with a ceramic coating having such a composition, and a method of making the ceramic coating
AssigneeSnecma Moteurs
InventorsSerge Alperine, Véronique Arnault, Odile Lavigne, Rémy Mevrel
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Abstract
A low thermal conductivity heat barrier composition, particularly for a superalloy article, is disclosed comprising a zirconia base and a dysprosium oxide having the dual function of stabilizing the zirconia and reducing the thermal conductivity thereof. Optionally, the composition also comprises a metal oxide containing a quadrivalent metallic ion selected from the group consisting of hafnium dioxide, cerium dioxide, uranium dioxide, and mixtures thereof.
Claims19
A low thermal conductivity heat barrier composition consisting essentially of zirconia and a dysprosium oxide.
A method of making a heat barrier coating on a superalloy substrate, the method comprising the steps of:
- depositing a bonding underlayer on the superalloy substrate;
- and
- depositing on the underlayer a ceramic coating consisting essentially of zirconia and a dysprosium oxide.
A low thermal conductivity heat barrier composition comprising zirconia, a dysprosium oxide, and hafnium dioxide.
Dependencies are inferred from the claim text.