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

Active Publication Date: 2017-08-29
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the object of the present invention is to provide a method for quickly removing the thermal spray coating, which solves the current situation of low efficiency, long cycle and high labor intensity of the existing sandblasting method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

A method for quickly removing a thermal spray coating, the sandblasting material adopts alloy sand with a particle size of 0.5-5.0mm, special-shaped alloy sand with an aspect ratio of 1.0-5.0 and ceramic sand with a mesh of 10-50, the alloy sand, special-shaped The mass ratio of the three raw materials of alloy sand and ceramic sand is (1~4):(1~4):1; before sandblasting, first pour the three raw materials into the iron bucket at the same time to facilitate the mixing of raw materials , and then pour the mixed sand in the iron bucket into the sand tank for sandblasting, the blasting air source pressure is 0.5‑0.9MPa; the present invention optimizes the composition of sand grains, increases the air source pressure, and greatly shortens the old coating Removal time, compared with single ceramic sandblasting to remove old coatings, the time is reduced by 60-75%, while reducing production costs, realizing the economical and efficient removal of old coatings, suitable for various metals, alloys, and cermet coatings layer removal.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a method for quickly removing a thermal spray coating. Background technique [0002] Power system components are increasingly being protected by thermal spraying on their surfaces. In coal-fired power plants, hydropower plants, and gas-fired power plants, in order to improve the service life of equipment and extend the maintenance cycle of units, thermal spraying technology is often used to protect the surface of parts subject to corrosion, wear, water erosion, and cavitation. The actual operating conditions and conditions of different power stations determine that tungsten carbide, nickel-chromium chromium carbide, metal or alloy coatings will be damaged to varying degrees. For parts with serious coating damage, the coating needs to be re-sprayed. In order to ensure the quality of the newly sprayed coating, it is necessary to thoroughly remove the old coating in an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24C1/00B24C11/00
CPCB24C1/08B24C11/00
Inventor 刘刚李勇李太江李巍杨二娟李聚涛米紫昊杨兰吕品正
Owner XIAN THERMAL POWER RES INST CO LTD
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