Process for treating the surface of a component, made from a Ni based superalloy, to be coated
AssigneeAlstom (Switzerland) Ltd
InventorsJohn Fernihough, Andreas Bogli, Christoph Tonnes
Life of this patent
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Abstract
A process for treating the surface of a component prior to coating. The component is made from a Ni based superalloy designed for high temperature service. Both the component and the coating include the elements Al and/or Cr. The process includes depleting the outer surface of the component of any one or a combination of Al, Ti or Cr and thereafter applying the coating directly on the depleted surface. The process minimizes the formation of a brittle gamma prime phase within the interdiffusion zone during service of the component. The process can also be used to renew old damaged coatings.
Claims14
A process for treating the surface of a component prior to applying a coating, wherein the component is a newly manufactured part which comprises a Ni based superalloy, and both the component and the coating include the elements Al and/or Cr, the process comprising steps of:
- depleting the surface of the component of any one or a combination of Al, Ti, or Cr;
- wherein the component has not been coated prior to the depleting step;
- and
- applying the coating directly on the depleted surface.
A process for treating the surface of a component prior to applying a coating, wherein the component comprises a Ni based superalloy, and both the component and the coating include the elements Al and/or Cr, the process comprising steps of:
- removing a prior coating and an existing interdiffusion zone between the prior coating and the component;
- subsequent to the removing step, depleting the surface of the component of any one or a combination of Al, Ti, or Cr;
- and
- applying the coating directly on the depleted surface.
A process for treating the surface of a component prior to applying a coating, wherein the component comprises a Ni based superalloy, and both the component and the coating include the elements Al and/or Cr, the process comprising steps of:
- depleting the surface of the component of any one or a combination of Al, Ti, or Cr;
- and
- applying the coating directly on the depleted surface;
- wherein the component undergoes a solution and/or precipitation hardening heat treatment during the depleting step.
A process for treating the surface of a component prior to applying a coating, wherein the component comprises a Ni based superalloy, and both the component and the coating include the elements Al and/or Cr, the process consisting essentially of the steps of:
- depleting the surface of the component of any one or a combination of Al, Ti, or Cr;
- and
- applying the coating directly on the depleted surface.
Dependencies are inferred from the claim text.