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AssigneeGeneral Electric Company
InventorsGilbert Farmer, Jeffrey Arnold Fehrenbach
Estimating the term…
A process of removing deposits from through-holes in a component, such as metallic bond coat and ceramic materials from cooling holes in an air-cooled gas turbine engine. The process is particularly effective in removing a TBC material deposited in a cooling hole of a component as a result of depositing a coating of the TBC material on a surface of the component, in which the deposit is removed from the cooling hole without damaging the cooling hole or the TBC coating surrounding the cooling hole on the coated surface of the component. A preferred feature is that the cooling hole, including the entrance to the hole at a surface of the component opposite the coated surface and the coating surrounding the exit of the hole at the coated surface, exhibits improved surface characteristics that increase the discharge coefficient of the cooling hole, as evidenced by an increase in the effective area of the cooling hole.
A process of removing a deposit from a through-hole of a component having a coating on a first surface thereof, the deposit being contiguous with the coating and not fully closing the through-hole, the process comprising the step of directing a liquid-containing jet at the through-hole from a second surface of the component opposite the first surface, the jet containing non-abrasive particulate media and being emitted from a nozzle at a pressure insufficient to remove substantially all of the deposit from the through-hole if the particulate media were not present in the jet, whereby removal of the deposit is primarily by the particulate media propelled by the jet and not the liquid.
A process of removing deposits from cooling holes that intersect a first surface and an oppositely-disposed second surface of an air-cooled gas turbine engine component, the process comprising the steps of:
A component having a coating on a first surface thereof and a through-hole from which has been removed a deposit that was contiguous with the coating, the deposit being removed by directing a liquid-containing jet at the through-hole from a second surface of the component opposite the first surface, the jet containing non-abrasive particulate media and being emitted from a nozzle at a pressure insufficient to remove substantially all of the deposit from the through-hole if the particulate media were not present in the jet, wherein surfaces of the component and the coating defining the through-hole are deburred and smoothed so as to increase the discharge coefficient of the through-hole.
An air-cooled gas turbine engine component having a metallic bond coat on a first surface thereof, a ceramic layer on the bond coat, and cooling holes that intersect a first surface and an oppositely-disposed second surface of the component, wherein deposits have been removed from the cooling holes that were contiguous with the coating, the deposits being removed by directing a liquid-containing jet at the cooling holes from the second surface of the component, the jet containing spherical non-abrasive particulate media and being emitted from a nozzle at a pressure insufficient to remove substantially all of the deposit from the cooling holes if the particulate media were not present in the jet, wherein surfaces of the component and the ceramic layer defining the cooling holes are deburred and smoothed so as to increase the discharge coefficient of the cooling holes to a value of at least 0.9.
Dependencies are inferred from the claim text.