Method for rapidly removing thermal spraying coating

A thermal spraying and coating technology, applied in metal processing equipment, manufacturing tools, abrasives, etc., can solve the problems of low efficiency, high labor intensity, long cycle, etc., to reduce production costs, increase air source pressure, and reduce time Effect

Active Publication Date: 2015-08-26
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 s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example one

[0017] After a power station's fully sprayed impeller has been running for several years, the old tungsten carbide coating on the surface needs to be completely removed and then sprayed again. The diameter of the impeller is 3.7m, and the internal runners are sprayed with coating. After service, the original coating fails. The old coating needs to be removed before re-spraying. The old coating occupies 80% of the original sprayed area, which is about 68 square meters. The invention is used for sandblasting. The process is as follows.

[0018] First, the alloy sand, special-shaped alloy sand, and ceramic sand are mixed in a ratio of 2:1:1, and then the mixed sand is poured 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 removal of the old impeller tungsten carb...

Example Embodiment

[0019] Example two

[0020] After running for several years with a spray-protected impeller in a power station, the nickel-based cermet coating on the surface needs to be completely removed and then sprayed again. The diameter of the impeller is about 1.8m, and the surfaces of the blades are sprayed with nickel-based cermet coating. After several years of service, the original coating fails. The old coating must be completely removed before re-spraying. The old coating occupies 70% of the original sprayed area, which is about 12 square meters. The sandblasting process is as follows.

[0021] First, the alloy sand, special-shaped alloy sand, and ceramic sand are mixed in a ratio of 4:4:1, and then the mixed sand is poured into the sandblasting tank. Adjust the air source pressure to 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 greatly reduces the cost of the old...

Example Embodiment

[0022] Example three

[0023] After a gas turbine channel component protected by spraying for a gas turbine power station has been running for about 12,000 hours, the nickel-based superalloy coating on the surface needs to be completely removed and then sprayed again. The number of blades to be removed is 10, which is sandblasted by the present invention. The process is as follows.

[0024] First, the alloy sand, special-shaped alloy sand, and ceramic sand are mixed in a ratio of 1:1:1, and then the mixed sand is poured into the sandblasting tank. Adjust the air source pressure to reach 0.50MPa, start sandblasting, use traditional sandblasting process to blast, and the time required to remove the coating of a single blade is about 2 hours. With the present invention, the sandblasting time is shortened to 15min, which is greatly shortened Removal of the old nickel-based superalloy coating of the impeller. And after the coating is removed, the surface quality of the blade is better...

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Abstract

The invention discloses a method for rapidly removing a thermal spraying coating. A sand blasting material adopts alloy sand with diameters being 0.5-5.0 mm, special-shaped alloy sand with the ratio of length to width being 1.0-5.0 as well as 10-50-mesh ceramic sand, wherein the mass ratio of the alloy sand to the special-shaped alloy sand to the ceramic sand is (1-4):(1-4):1; before sand blasting, three raw materials are uniformly poured into an iron barrel simultaneously, mixing of the raw materials is facilitated, the mixed sand in the iron barrel is poured into a sand tank for sand blasting, and the air source pressure for sand blasting is 0.5-0.9 MPa. The sand composition is optimized and improved, the air source pressure is increased, the removal time of an old coating is greatly shortened, and compared with the time for old coating removal through single ceramic sand blasting, the time is shortened by 60%-75%; meanwhile, the production cost is reduced, the old coating is economically and efficiently removed, and the method is suitable for removing various metal coatings, alloy coatings and metal ceramic coatings.

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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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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