A Method for Quickly Removing Thermal Spray Coatings
A thermal spraying and coating technology, applied in metal processing equipment, manufacturing tools, abrasives, etc., can solve the problems of high labor intensity, long cycle, low efficiency, etc., and achieve the goal of increasing the pressure of the gas source, reducing the time and reducing the production cost Effect
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Embodiment 1
[0017] After the fully sprayed impeller of a power station has been in operation for several years, the old tungsten carbide coating on the surface needs to be completely removed and then re-sprayed. The diameter of the impeller is 3.7m, and the internal flow channels are all sprayed with coating. After serving, the original coating fails, and the old coating needs to be completely removed before re-spraying. The old coating accounts for 80% of the original spraying area, which is about 68 square meters. Adopt the present invention to blast it, and the process is as follows.
[0018] First mix the alloy sand, special-shaped alloy sand, and ceramic sand in a ratio of 2:1:1, and then pour the mixed sand into the sandblasting tank. Adjust the air source pressure to 0.75MPa, and start sandblasting. The traditional sandblasting process takes about 22 days. With the present invention, the sandblasting time is shortened to 7 days, which greatly shortens the work of removing the tungst...
Embodiment 2
[0020] After the spray-protected impeller of a power station has been in operation for several years, the nickel-based cermet coating on the surface needs to be completely removed and then re-sprayed. The diameter of the impeller is about 1.8m, and the surface of the blades is sprayed with nickel-based cermet coating. After serving for several years, the original coating fails, and the old coating needs to be completely removed before re-spraying. The old coating accounts for 70% of the original spraying area, which is about 12 square meters. It is sandblasted by the present invention, and the process is as follows.
[0021] First mix the alloy sand, special-shaped alloy sand, and ceramic sand in a ratio of 4:4:1, and then pour the mixed sand into the sandblasting tank. Adjust the air source pressure to reach 0.90MPa, and start sandblasting. The traditional sandblasting process takes about 5 days. With the present invention, the sandblasting time is shortened to 1 day, which gr...
Embodiment 3
[0023] After the spray-protected gas turbine channel parts of a gas turbine power station have been in operation for about 12,000 hours, the nickel-based superalloy coating on the surface needs to be completely removed and then re-sprayed. The number of blades to be removed is 10, and the invention is used to sandblast them. The process is as follows.
[0024] First mix the alloy sand, special-shaped alloy sand, and ceramic sand in a ratio of 1:1:1, and then pour the mixed sand into the sandblasting tank. Adjust the air source pressure to 0.50MPa, start sandblasting, and use the traditional sandblasting process for sandblasting. The time required for the removal of a single blade coating is about 2 hours. With the present invention, the sandblasting time is shortened to 15min, which greatly shortens the time required for sandblasting. Removal of the old nickel-based superalloy coating on the impeller. And after the coating is removed, the surface quality of the blade is bette...
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