Protective coating and its preparing method

A protective coating and coating technology, applied in the field of material science, can solve problems such as affecting the service life of the coating, and achieve the effect of eliminating voids, improving compactness and good corrosion resistance.

Inactive Publication Date: 2006-11-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at high temperature, due to the difference in composition, there will be obvious diffusion phenomenon between the coatings, and a new brittle phase will be formed, which will significantly affect the service life of the coating.

Method used

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  • Protective coating and its preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Aeroengine compressor blades, after surface grinding, decontamination, acetone ultrasonic cleaning and sprinkling rinse, are placed in a vacuum chamber. During the coating process, the plated parts revolve and rotate in the vacuum chamber. The targets are Al 10%, 20%, Al 30% (atomic percentage) of TiAl alloy and pure Ti. The total thickness of the coating is about 6 μm: first deposit a TiN alloy coating (2) with a thickness of about 1 μm on the surface of the substrate (1), the coating time is 20 minutes, the vacuum degree is 10 N layer (3), TiAl 20 N layer (4) and TiAl 30 N layer (5), the thickness of each layer is between 1-2μm, the deposition time is 10-20min, the vacuum degree is 0.3Pa, the electron gun beam current is 100A, the bias voltage is -900V, and the duty cycle is 20%, the substrate temperature is 400-480°C.

Embodiment 2

[0024] Aeroengine compressor blades, after surface grinding, decontamination, acetone ultrasonic cleaning and sprinkler rinse, are placed in a vacuum chamber. During the coating process, the plated parts revolve and rotate in the vacuum chamber. The target materials contain 10% and 20% Al respectively. , 30% (atomic percentage) TiAl alloy and pure Ti. The total thickness of the coating is 8 μm: first, a TiN alloy coating (2) with a thickness of about 2 μm is deposited on the surface of the substrate (1), the coating time is 20 minutes, the vacuum degree is 10 N layer (3), TiAl 20 N layer (4) and TiAl 30 N layer (5), the thickness of each layer is 1-2μm, the deposition time is 10-20min, the vacuum degree is 0.3Pa, the electron gun beam current is 900A, the bias voltage is -800V, and the duty cycle is 20%. The substrate temperature is 400-480°C.

Embodiment 3

[0026] Aeroengine compressor blades, after surface grinding, decontamination, acetone ultrasonic cleaning and sprinkler rinse, are placed in a vacuum chamber. During the coating process, the plated parts revolve and rotate in the vacuum chamber. The target materials contain 10% and 20% Al respectively. , 30% (atomic percentage) TiAl alloy and pure Ti. The total thickness of the coating is about 7 μm: first deposit a TiN alloy coating (2) with a thickness of about 1 μm on the surface of the substrate (1), the coating time is 20 minutes, the vacuum degree is 10 N layer (3), TiAl 20 N layer (4) and TiAl 30 N layer (5), the thickness of each layer is about 1-2 μm, the deposition time is 10-20 min, the vacuum degree is 0.3 Pa, the electron gun beam current is 80A during coating, the bias voltage is -900V, and the duty cycle is 20%. , The substrate temperature is 400-480°C.

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Abstract

The protective coating is made with TiAl alloy and pure Ti target material, and is one gradient TiAlN / TiN coating comprising TiN alloy layer deposited directly onto the substrate, and the successively deposited TiAl10N layer, TiAl20N layer and TiAl30N layer. The preparation process of the protective coating includes the first preparation of TiN alloy layer on the substrate, and the subsequent deposition of the TiAl10N layer, the TiAl20N layer and the TiAl30N layer. By means of proper target material components and reasonable technological parameters, the coating has less pinhole, pores and mutual diffusion of elements in different layers.

Description

Technical field: [0001] The invention relates to material science, and in particular provides a protective coating and a preparation method thereof. Background technique: [0002] The material of the blades of the exhaust air compressor of the aero-engine is mostly made of stainless steel. In the usual dry air, dense Cr can be formed on the surface. 2 o 3 Layer, which can prevent the further oxidation of the base material, so it has better anti-corrosion performance. However, since the blades of the aero-engine exhaust compressor work at 300-600°C, they are often affected by water vapor, active Cl - The combination of ion corrosion and dynamic and static loads causes the compressor blades to corrode rapidly in a short period of time, causing the compressor blades to fail to work normally, which has a great impact on flight safety. Therefore, improving the service life of aircraft components through effective protective measures has become an important research direction i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/34C23C14/46
Inventor 谢冬柏辛丽朱圣龙冯长杰王世臣王福会李明升
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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