Process For Obtaining Protective Coatings Against High Temperature Oxidation

Abstract

The invention relates to a process which allows obtaining protective coatings against high temperature oxidation based on MCrAlY in which M is selected from the group formed by Ni, Co or Fe or their alloys, and comprises the thermal spray of MCrAlY-based powders by high frequency pulse detonation (HFPD) techniques. A high density ceramic layer is optionally deposited on the MCrAlY layer by high frequency pulse detonation (HFPD) techniques.

1 . A process for obtaining protective coatings against high temperature oxidation based on MCrAlY in which M is selected from the group formed by Ni, Co or Fe or their alloys, characterized in that it comprises the thermal spray of MCrAlY-based powders by high frequency pulse detonation (HFPD) techniques.  
     
     
         2 . A process for obtaining protective coatings against high temperature oxidation according to  claim 1 , characterized in that the thermal spray is carried out using a mixture comprising at least one fuel and one combustion agent.  
     
     
         3 . A process for obtaining protective coatings against high temperature oxidation according to claims  1 , characterized in that the thermal spray is carried out using a gaseous mixture formed by methane or natural gas mixed with a dilution of inert gases selected from nitrogen, argon, helium or others and oxygen or air as a combustion agent.  
     
     
         4 . A process for obtaining protective coatings against high temperature oxidation according to  claim 1 , characterized in that a heat treatment is applied in a controlled atmosphere after the deposition of the MCrAlY layer to cause the diffusion.  
     
     
         5 . A process for obtaining protective coatings against high temperature oxidation according to  claim 1 , characterized in that a high density ceramic layer is applied on the MCrAlY layer by thermal spray, by means of high frequency pulse detonation (HFPD) techniques, the dense ceramic layer forming an anchor for the application of ceramic material thermal barriers, deposited by means of any thermal spray technique.  
     
     
         6 . A process for obtaining protective coatings against high temperature oxidation according to  claim 5 , characterized in that the thermal spray is carried out using a mixture comprising at least one fuel and one combustion agent.  
     
     
         7 . A process for obtaining protective coatings against high temperature oxidation according to  claim 6 , characterized in that the thermal spray is carried out using a mixture of gases selected from propane, propylene, ethylene or acetylene, and oxygen as a combustion agent.  
     
     
         8 . A process for obtaining protective coatings against high temperature oxidation according to  claim 5 , characterized in that a heat treatment is applied in a controlled atmosphere before or after the deposition of the dense ceramic layer to cause the diffusion.