US 12,454,891 B2
Protection against oxidation or corrosion of a hollow part made of a superalloy
Jérémy Rame, Moissy-Cramayel (FR); Amar Saboundji, Moissy-Cramayel (FR); and Mirna Bechelany, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 18/040,767
Filed by SAFRAN, Paris (FR)
PCT Filed Aug. 5, 2021, PCT No. PCT/FR2021/051444
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/029388, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2008333 (FR), filed on Aug. 6, 2020.
Prior Publication US 2023/0304409 A1, Sep. 28, 2023
Int. Cl. F01D 5/28 (2006.01); B22C 3/00 (2006.01); B22D 27/18 (2006.01); C23F 11/18 (2006.01)
CPC F01D 5/288 (2013.01) [B22C 3/00 (2013.01); B22D 27/18 (2013.01); C23F 11/18 (2013.01); F05D 2230/90 (2013.01); F05D 2300/132 (2013.01); F05D 2300/135 (2013.01); F05D 2300/143 (2013.01); F05D 2300/15 (2013.01); F05D 2300/175 (2013.01); F05D 2300/222 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A protection method, for protecting at least one hollow inner area of a turbine engine part made of a superalloy from oxidation and/or corrosion, said at least one hollow inner area having been formed by means of at least one core:
made of a material comprising a ceramic and/or metal or a metal and ceramic hybrid material, and
limited by an external surface which surrounds the at least one core,
the method comprising the steps of:
before bringing the superalloy around the at least one core, coating said external surface with a coating material comprising hafnium (Hf), and/or platinum (Pt), and/or chromium (Cr) and/or silicon (Si) and/or Yttrium (Y), or a mixture thereof;
before bringing the superalloy around the at least one core, diffusing said coating material in the at least one core between 800° C. and 1,250° C., under a pressure lower than 1 Pa; and
after coating said external surface of the at least one core with the coating material, bringing the superalloy in a molten state in contact with said coated external surface.