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Two-layer MCrAlY bonding layer and preparation method thereof

A double-layer structure and bonding layer technology, applied in chemical instruments and methods, coatings, layered products, etc., can solve the problems of decreased bonding force between the coating and the substrate, thermal expansion coefficient mismatch, and reduced interdiffusion, etc., to achieve Prevent the decline of formula performance and high temperature stability, improve oxidation resistance and corrosion resistance, and prolong service time

Inactive Publication Date: 2012-12-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these diffusion barrier systems tend to reduce the interdiffusion between the coating and the substrate or the thermal expansion coefficient does not match, resulting in a decrease in the bonding force between the coating and the substrate and easy peeling off; on the other hand, some diffusion-resistant materials The system destabilizes and decomposes at high temperature, causing a decrease in the ability to resist diffusion

Method used

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  • Two-layer MCrAlY bonding layer and preparation method thereof
  • Two-layer MCrAlY bonding layer and preparation method thereof
  • Two-layer MCrAlY bonding layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Preparation of NiCoCrAlY coating on DZ 125 qualitatively solidified superalloy substrate

[0048] (1) prepare the evaporating material rod, and set it aside;

[0049] The composition of NiCoCrAlY rod is nickel, cobalt, chromium, aluminum and yttrium, and its percentage by weight is 47.8% nickel, 20% cobalt, 22% chromium, 8.8% aluminum, 1.4% yttrium, the total amount of the above-mentioned components is 100%;

[0050] (2) Wire-cut the Φ16 DZ125 (composition in Table 2) alloy test rod into 2mm discs and polish it with 150#, 300#, 400#, 800# sandpaper in sequence to make the surface roughness Ra<0.8. Then put it into acetone for ultrasonic cleaning for 30min, and install it on the rotating substrate frame of electron beam physical vapor deposition equipment;

[0051] Table 2 Chemical composition table of DZ125 alloy (wt.%)

[0052]

[0053] (3) NiCoCrAlY feed rod is placed in the water-cooled copper crucible;

[0054] (4) Pump the vacuum chamber to the re...

Embodiment 2

[0063] Example 2: Preparation of NiCrAlY coating on DD6 single crystal superalloy substrate

[0064] (1) Prepare the evaporating rod and set it aside.

[0065] The composition of NiCrAlY rod is nickel, chromium, aluminum and yttrium, and its percentage by weight is 62.3% nickel, 25% chromium, 12% aluminum, 0.7% yttrium, and the total amount of the above-mentioned components is 100%;

[0066] (2) Wire-cut the Φ16 DD6 (see Table 3 for composition) alloy test bar into 2mm discs and polish it with 150#, 300#, 400#, 800# sandpaper in sequence to make the surface roughness Ra<0.8. Then put it into acetone for ultrasonic cleaning for 30min, and install it on the rotating substrate frame of electron beam physical vapor deposition equipment;

[0067] Table 3 Chemical composition of DD6 alloy (wt.%)

[0068]

[0069] (3) NiCrAlY feed rod is placed in the water-cooled copper crucible;

[0070] (4) Pump the vacuum chamber to the required lower than 5×10 -3 Pa vacuum degree;

[007...

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Abstract

The invention discloses a two-layer MCrAlY bonding layer and a preparation method thereof, which uses the plasma-assisted electron beam physical vapor deposition technology to prepare a coating with the following structure: the bottom layer is a low-aluminum (3-5wt.%) MCrAlY layer with a preferential-growing equiaxed crystal structure with the thickness of 5-20 micro meters and the crystal size of 20-50 micro meters; and the upper layer is a high-aluminum (8-12wt.%) MCrAlY layer with a columnar crystal structure, the thickness of 20-100 micro meters and the crystal size less than 1 micro meter. The two-layer structure can reduce the element interdiffusion between the MCrAlY coating and a high-temperature alloy matrix, therefore, the coating has better high-temperature oxidation resistance. Besides, the two-layer structure can inhibit the recrystallization, the TCP phase separation and the formation of a secondary reaction zone (SRZ) of the directionally solidified high-temperature alloy, the single-crystal high-temperature alloy and the like due to the deposition of an oxidation resistant coating.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, and relates to a MCrAlY protective coating with a double-layer structure. More specifically, it adopts a plasma-assisted electron beam physical vapor deposition (EB-PVD) Structured MCrAlY coating method. Background technique [0002] For modern gas turbine engines, one of the main means to improve their working efficiency is to increase the combustion operating temperature of the engine as a whole. Therefore, it is necessary to apply a high-temperature protective coating on the surface of the high-temperature working parts to improve the oxidation resistance and corrosion resistance of the high-temperature working parts. MCrAlY (M=Co, or Ni, or Co+Ni) coating is a cladding coating that has been widely used since the 1990s. MCrAlY coating has good high temperature oxidation resistance and hot corrosion resistance, and has good plasticity, and the composition selection is diverse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B33/00B32B15/01C23C14/30
Inventor 宫声凯王娟彭徽郭洪波徐惠彬
Owner BEIHANG UNIV
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