초록 ▼

The invention is a process for removing ceramic thermal barrier layers from gas turbine engine hardware. A combination of chemical and mechanical steps are used to remove the thermal barrier coating from the substrate without removing the bond coat from the substrate. The process leaves the bond coa

The invention is a process for removing ceramic thermal barrier layers from gas turbine engine hardware. A combination of chemical and mechanical steps are used to remove the thermal barrier coating from the substrate without removing the bond coat from the substrate. The process leaves the bond coat on the substrate in condition to receive a repair ceramic thermal barrier coating. The process includes a caustic solution treatment in an autoclave under controlled conditions followed by a mechanical abrasion process.

대표청구항 ▼

[ What is claimed is:] [1.] Method for removal of ceramic thermal barrier coating from a superalloy substrate having a bond coat thereon which comprises:a. immersing said ceramic thermal barrier coated substrate in a caustic solution at a pressure in excess of atmospheric and a maximum process tempe

[ What is claimed is:] [1.] Method for removal of ceramic thermal barrier coating from a superalloy substrate having a bond coat thereon which comprises:a. immersing said ceramic thermal barrier coated substrate in a caustic solution at a pressure in excess of atmospheric and a maximum process temperature in excess of the atmospheric boiling point of said caustic solution for a time sufficient to remove at least 80% of said ceramic thermal barrier coating without changing the chemical composition of the bond coat to a depth of more than about 15 microns,b. mechanically abrading the substrate to remove any residual ceramic material and to remove an amount of bond coat material greater or equal to the thickness of the bond coat whose chemical composition may have been changed by the caustic chemical step.