The method of repair parts, mainly blades, gas turbine engines

 

(57) Abstract:

The invention relates to aircraft engine industry and can be used in aviation, shipbuilding and automotive industries. The method includes removing the protective coating, defects, surface preparation and application of a new protective coating. Repair parts with a protective coating of zirconium nitride before removing the protective coating to soften complete peeling or swelling, maintaining the blades in the bath with bubbling. This set of blades in the tub in a checkerboard pattern, directing them to one side of the input edge, and positioning them so that the distance between the input and output edges of the adjacent blades not less than half the average chord section of the blade. Remove protective coatings and surface preparation for application of a new protective coating is carried out in the torus sleeve vibration setting processing of ceramic granules. After applying a new protective coating to equalize its irregularities and seal steel balls. The invention will improve the quality of repair and reliability of refurbished products with protective pokrytie. 1 C.p. f-crystals.

The invention relates to aircraft engine industry, in particular to the repair of blades for gas turbine engines, and can be used in aviation, shipbuilding and automotive industries.

There is a method of repair of blades for gas turbine engines lies in their inspection, the removal of the surface layer in the container vibratory grinding granules, not having open porosity, using as a medium slightly alkaline composition, with the subsequent surface hardening of blades is carried out by processing the stream of powder Nickel alloy with a particle size of 50-100 μm (See. RF patent 2094200, CL. 23 P 6/00, publ. 27.10.97).

This method cannot be used to repair parts with a protective coating of zirconium nitride as such a coating cannot be removed vibratory grinding granules, not having open porosity, and, in addition, the blades with a protective coating of zirconium nitride is impractical to process the stream of powder Nickel alloy, as it leads to changes in their geometric parameters (reduction of the chord, the thickness of the input and output edges, as well as to the deterioration of surface cleanliness)oil, consisting in the removal of the protective coating, defects, surface preparation and application of a new protective coating (See. RF patent 2113964, CL. 23 P 6/00, 27.06.98).

The disadvantages of this method are that the removal of the protective coating is produced by galvanic methods in solutions that may not be used to remove zirconium nitride, because they are not able to loosen. In addition, with this repair restores a coating (silver, copper and so on), which usually requires surface preparation, sandblasting, which reduces the purity of the surface.

Thus, the known methods do not allow to produce high-quality repair of blades having a protective coating of zirconium nitride.

The objective of the invention is improving the quality of repair and reliability of refurbished products with a protective coating of zirconium nitride, without the use of manual operations, and improving the surface finish of the repaired GTE blades.

The problem is solved by that in the method of repair parts, mainly blades, gas turbine engines, including the removal of the protective coating, the device is m a coating of zirconium nitride before removing the protective coating to soften complete peeling or swelling, maintaining the vanes in the hot bubbling in the solution of the following composition:

chromic anhydride, 5 to 10 g per 1 liter of water

nitric acid - 100-140 g on 1 l of water

hydrofluoric acid - 9-12 g on 1 l of water

when the temperature of the solution 20-30oWith set of blades in the tub in a checkerboard pattern, directing them to one side of the input edge, and positioning them so that the distance between the input and output edges of the adjacent blades not less than half the average chord section of the blade, and removing the protective coating and surface preparation for application of a new protective coating is carried out in the torus sleeve vibration setting processing of ceramic granules, after applying a new protective coating to equalize its irregularities and seal steel ball surface is not lower than grade 9 in the torus sleeve vibrating installed in the polishing solution.

A polishing solution may be a solution of 7-12 g triethylamine to 1 liter of water or a solution of naphthenic soap on triethylamine.

After softening the protective coating can be lightening the surface of 2-5% aqueous solution of hydrochloric acid, which allows palestinia blades in the bath, because you must install the highest number of blades of at least the size of a bath.

Experimentally selected minimum distance between the input and output edges of the adjacent blades, which is not less than half the average chord section of the blade provides a complete loosening of the coating, excluding corrosion of the base material and the possibility of placing the maximum number of blades.

The implementation of the method is examined on the example of compressor blades of GTE, made of a material VTZ-1 with subsequent coating of zirconium nitride by sputtering in vacuum at facilities map-1.

However, this method can be used for repair and other parts of the CCD, having a coating of zirconium nitride.

Gas turbine engines received in repair after running out of warranty or repair resource disassembled for parts or repair which is carried out as follows:

- blades are loaded into the bath with any alkaline solution, which is purification from the production impurities;

- wash the blades in hot water;

- loosen the nitride coating, circulate 100-140 g on 1 l of water, hydrofluoric acid 9-12 g on 1 l of water at a temperature of 20-30 solutionoC. Blades have staggered to one side of the input edge to the distance between the input and output edges of the adjacent blades not less than half of the average chord section of the blade, and include sparging (air supply pressure, eliminating spray solution). After swelling of the coating or peeling blades are removed from the bath and make the operation of lightening in a 2-5% solution of hydrochloric acid;

- make the final destruction of the protective coating and improving the cleanliness of the surfaces of the blades in the torus sleeve vibration setting in the desktop agent type ceramic pellets by known methods;

- blades are removed from the container installation and washed in hot water;

- conduct a special inspection LUM-1-S on the detection of micro-cracks and other defects;

- make the fault detection of the blades in accordance with the "Guide overhaul";

- repair provided "Guidance on major maintenance (polishing, heat treatment, polishing, control and so on) to ensure the geometry and strength characteristics;

- podloterejnyj granules PT-5, dipped in the following solution: trinacria phosphate - 80 g/l, sodium carbonate, 100 g/l, sodium nitride 100 g/l for 40 (+10) minutes;

- the coating of zirconium nitride carried out in a known manner, for example by sputtering in vacuum on the installation map-1;

after coating of zirconium nitride on the blades to produce alignment in the torus sleeve vibratory installation according to the above technology of surface preparation in the same solution, but within 20 minutes;

after leveling of the coating to produce a seal in the torus sleeve vibrating installed in a polishing solution (7-12 g triethylamine to 1 liter of water or naphthenic soap on triethylamine) steel balls of SH-15 with a purity of not lower than grade 9 for 20 (+10) minutes;

- refurbished blades direct on site Assembly of the rotors of the compressor.

The result is the elimination of manual operation of the polishing and the increase in the number of valid repair parts due to the limited removal of metal in the repair. The proposed method also allows you to exclude the operation of blowing blades oxide for better adhesion of the coating with the basic material and to increase the purity of coating at least denudata protective coating, elimination of defects, surface preparation and application of a new protective coating, characterized in that in the repair parts with a protective coating of zirconium nitride, before removing the protective coating to soften complete peeling or swelling, maintaining the blades in a tub of bubbling in the solution of the following composition, g on 1 l of water:

Chromic anhydride - 5-10

Nitric acid - 100-140

Hydrofluoric acid - 9-12

when the temperature of the solution 20-30oWith set of blades in the tub in a checkerboard pattern, directing them to one side of the input edge, and positioning them so that the distance between the input and output edges of the adjacent blades not less than half the average chord section of the blade, and removing the protective coating and surface preparation for application of a new protective coating is carried out in the torus sleeve vibration setting processing of ceramic granules, after applying a new protective coating to equalize its irregularities and seal steel ball surface is not lower than grade 9 in the torus sleeve vibrating installed in the polishing solution.

2. The method according to p. 1, characterized in that after softening the protective

 

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