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Marine-corrosion-resisting and wear-resisting material, coating and preparation method thereof

A wear-resistant and marine technology, applied in metal material coating technology, coating, metal processing equipment, etc., can solve the problems of coating and substrate galvanic corrosion, coating peeling, etc., and achieve the effect of wide application prospects

Active Publication Date: 2019-11-29
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a corrosive environment, when the abradable coating is damaged by corrosion and the corrosive medium penetrates into the coating / substrate interface, galvanic corrosion between the coating and the substrate will occur, resulting in the overall peeling off of the coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: using a vacuum atomization process to prepare CuAl alloy powder, wherein the Al content is 0.1-7.4%;

[0018] Step 2: Mechanically mix the CuAl alloy powder prepared in Step 1 with the polyphenylene powder at a weight ratio of 9:1 to obtain an abradable surface layer powder;

[0019] Step 3: Clean the surface of the substrate to be coated and roughen it by blasting sand, screen the CuAl powder prepared in step 1 below 400 mesh, and use the Impact cold spray gun to prepare the CuAl bottom layer. The cold spray parameters are: spray distance 20mm, nitrogen pressure 40bar , The powder feeding rate is 30g / min, the gas temperature is 450°C, and the coating thickness is 0.1-0.2mm.

[0020] Step 4: On top of the cold-sprayed CuAl bottom layer, use atmospheric plasma spraying to spray the abradable surface layer powder prepared in Step 2. The spraying parameters are: current 400A, voltage 70V, powder feeding rate 40g / min, spray distance 120mm, coating thickness 1.5 ~2m...

Embodiment 2

[0022] Step 1: using a vacuum atomization process to prepare CuAl alloy powder, wherein the Al content is 0.1-7.4%;

[0023] Step 2: Mechanically mix the CuAl alloy powder prepared in Step 1 with the polyphenylene ester powder at a weight ratio of 9:1, heat a polyvinyl alcohol binder with a total material weight of 3% in the mixture for agglomeration and granulation, and obtain an abradable surface powder;

[0024] Step 3: Clean the surface of the substrate to be coated and roughen it by blasting sand, screen the CuAl powder prepared in step 1 below 400 mesh, and use the Impact cold spray gun to prepare the CuAl bottom layer. The cold spray parameters are: spray distance 20mm, nitrogen pressure 40bar , The powder feeding rate is 30g / min, the gas temperature is 450°C, and the coating thickness is 0.1-0.2mm.

[0025] Step 4: On top of the cold-sprayed CuAl bottom layer, use atmospheric plasma spraying to spray the abradable surface layer powder prepared in Step 2. The spraying ...

Embodiment 3

[0028] Step 1: using a vacuum atomization process to prepare CuAl alloy powder, wherein the Al content is 0.1-7.4%;

[0029] Step 2: Mechanically mix the CuAl alloy powder prepared in Step 1 with polyphenylene ester powder and hexagonal boron nitride powder in a weight ratio of 8:1:1, and heat a polyvinyl alcohol binder with a total material weight of 3% in the mixture Carry out agglomeration and granulation to obtain abradable surface layer powder;

[0030] Step 3: Clean the surface of the substrate to be coated and roughen it by sand blasting, screen the CuAl powder prepared in step 1 with a mesh size below 500, and use Impact cold spray gun to prepare the CuAl bottom layer. The cold spray parameters are: spray distance 20mm, nitrogen pressure 40bar , The powder feeding rate is 30g / min, the gas temperature is 450°C, and the coating thickness is 0.1-0.2mm.

[0031] Step 4: On top of the cold-sprayed CuAl bottom layer, use atmospheric plasma spraying to spray the abradable su...

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PUM

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Abstract

The invention discloses a marine-corrosion-resisting and wear-resisting material, a coating and a preparation method thereof and belongs to the technical field of fuel gas turbines. Single-phase CuAlwith excellent marine-corrosion-resisting and wear-resisting properties is adopted as a wear-resisting face layer skeleton component, insulating polyester or boron nitride and the like are adopted asa wear-resisting component, CuAl with chemical compositions completely consistent with those of the wear-resisting face layer skeleton component is adopted as a bottom layer material, and the coatingis prepared through a thermal spraying method. According to the material, the coating and the preparation method, the problems that a traditional wear-resisting coating skeleton component does not resist to corrosion, galvanic corrosion is generated between the compositions and between a face layer and a bottom layer due to the potential difference, and coating corrosion is caused by easy seepageof corrosion media to the coating and a base body interface are solved, and the material is widely applied to marine gas turbines serving in marine environment, aircraft engines, ground fuel gas turbines and the like.

Description

technical field [0001] The invention relates to a structural design and a preparation method of a marine environment corrosion-resistant and wearable sealing coating used for sealing the gas path of an aeroengine and belongs to the technical field of gas turbines. Background technique [0002] The abradable sealing coating is coated on the surface of the stator part of the gas turbine, and it can be actively worn when it is rubbed against the rotor part under high temperature and high speed conditions, so that the minimum gap between the rotor and the stator can be achieved through the interference fit of the rotor and the stator Control, while protecting rotor components from wear, is of great significance for reducing gas turbine fuel consumption, improving efficiency and operating safety. Due to the characteristics of porous, multi-component, and multi-layer, the abradable sealing coating is easily invaded by corrosive media such as salt spray in the marine environment, a...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06C23C24/08C22C9/01C22C32/00B22F1/00
CPCC23C4/134C23C4/06C23C24/087C22C9/01C22C26/00C22C2026/007B22F1/10
Inventor 于月光刘建明章德铭刘通黄凌峰郭丹王帅卢晓亮侯伟骜
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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