Maskant for fluoride ion cleaning
a fluoride ion cleaning and masking technology, applied in the field of masking materials, can solve the problems of metal oxides forming within the cracks, cracks in airfoils, and cracks in airfoils
Inactive Publication Date: 2013-12-05
UNITED TECH CORP
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- Application Information
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Benefits of technology
The patent describes a method of treating a surface by applying a layer of nickel plating over a nickel alloy surface and then exposing it to a fluoride ion cleaning to remove impurities. The thickness of the nickel plating is generally less than 0.0005 inches (0.001 cm). The method can be used on components with cracks, such as gas turbine engine components, and can help to repair the cracks. The nickel plating can be deposited using a nickel alloy and can be greater than or equal to 0.0001 inches (0.00254 cm) in thickness. The technical effect of this method is to provide a protective layer of nickel plating that can help to prevent corrosion and damage to components, particularly in gas turbine engines.
Problems solved by technology
It sometimes occurs that a crack may form in one of the airfoil components.
One challenge is that the cracks may occur while the airfoil component is still in service in the turbine engine.
Thus, metal oxides may form within the cracks.
Unfortunately, when fluoride ion cleaning is utilized with nickel alloy components, it may also remove some of the aluminum or titanium.
Essentially, this means that new cracks are formed by the fluoride ion cleaning.
This layer has been unduly thick, and has also been sacrificial, and thus does not survive the cleaning process.
Method used
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[0035]A component 20 is illustrated in FIG. 1. Component 20 may be a turbine blade or a turbine vane. As known, component 20 has an airfoil shape.
[0036]A crack 22 is shown in a surface. The crack must be repaired before the part is returned for service. Various techniques are known for repairing the cracks, and any one of the actual methods for repairing may benefit from the teachings of this application.
[0037]A problem addressed by this application may be understood from FIG. 2. As shown in FIG. 2, the crack 22 will develop metal oxides as shown at 23. This occurs as the component 20 will typically remain in service after the crack occurs, and thus, the exposed surfaces in the crack will form oxides. In one embodiment, the component 20 is formed of nickel alloy, and may contain materials in addition to nickel, such as aluminum and titanium.
[0038]As mentioned above, it is known to use a fluoride ion cleaning technique to remove the oxides 23 from the crack 22 prior to repair of the ...
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Abstract
A method of treating a surface includes the steps of providing a plating including at least some nickel over a nickel alloy surface in a thickness less than 0.0005″ (0.001 cm), and exposing the surface to a fluoride ion cleaning to remove impurities on the surface, and leaving at least some of the plating.
Description
BACKGROUND OF THE INVENTION[0001]This application relates to a maskant material which protects a surface being subjected to fluoride ion cleaning.[0002]Gas turbine engines are known, and typically include a compressor which delivers compressed air into a combustor section. A fan may deliver air into the compressor section in some types of turbine engines. In the combustion section, the air is mixed with fuel and ignited. Products of this combustion pass downstream over turbine rotors. The turbine rotors, the compressor, and the fan all included any number of airfoil structures which are subject to stresses both from mechanical and temperature issues.[0003]It sometimes occurs that a crack may form in one of the airfoil components. Various techniques are known for repairing the cracks in an airfoil. One challenge is that the cracks may occur while the airfoil component is still in service in the turbine engine. Thus, metal oxides may form within the cracks.[0004]One type of airfoil co...
Claims
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IPC IPC(8): C23F1/00F04D29/38
CPCB23P6/045C23G5/00F01D5/005C23C18/1689C23C18/1616C23C18/32
Inventor KINSTLER, MONIKA D.
Owner UNITED TECH CORP