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A kind of single crystal superalloy and coating interface diffusion barrier layer and preparation method thereof

A high-temperature alloy and diffusion-resistant layer technology, which is applied in the direction of solid-state diffusion coating, metal material coating process, coating, etc., can solve the problems of coating peeling, low binding force, high cost, etc., and achieve simple and adjustable preparation methods Strong, low-cost effect

Active Publication Date: 2021-07-16
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The metal diffusion barrier layer has retardation selectivity and high cost, and the double (poly) metal has a good diffusion barrier effect, but it is easy to generate brittle phases at the interface and affect the mechanical properties of the system
The preparation process of the ceramic barrier layer is complicated, the thermal expansion coefficient difference between the substrate and the bonding layer is large, and the bonding force is low, which easily leads to peeling off of the coating

Method used

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  • A kind of single crystal superalloy and coating interface diffusion barrier layer and preparation method thereof
  • A kind of single crystal superalloy and coating interface diffusion barrier layer and preparation method thereof
  • A kind of single crystal superalloy and coating interface diffusion barrier layer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Nickel-based single crystal superalloy is selected as the base material, with a length of 30 mm, a width of 10 mm, and a thickness of 1.5 mm. Alloy matrix samples are processed by corundum blasting, and the roughness Ra is 0.8-1.25.

[0037] (2) Put the polished alloy into acetone and ultrasonically clean it for 5 minutes, take it out and dry it with nitrogen.

[0038] (3) Place the alloy on a quartz boat and place it in the constant temperature zone of the tube furnace. After the system is tested for tightness, argon gas with a flow rate of 500 sccm is introduced for 10 minutes, and the air in the system is exhausted; then the flow rate is 50 sccm. H 2 , raise the temperature of the tube furnace to 1000°C and keep it warm for 1h; 4 gas, the reaction time is 60min; after the reaction, stop feeding CH 4 and H 2 , turn off the heating voltage of the tube furnace, move the sample out of the constant temperature zone of the furnace for rapid cooling, and open the fu...

Embodiment 2

[0042] (1) A nickel-based single crystal superalloy is selected as the base material, with a diameter of 10 mm and a thickness of 0.5 mm. Use No. 600, No. 800 and No. 1000 sandpaper in turn to grind the surface of the sample to a roughness Ra of about 0.8.

[0043] (2) Put the polished alloy into ethanol and acetone and ultrasonically clean it for 5 minutes, take it out and dry it with nitrogen.

[0044] (3) Place the alloy on a quartz boat and place it in the constant temperature zone of the tube furnace. After the system is tested for tightness, argon gas with a flow rate of 200 sccm is introduced for 20 minutes, and the air in the system is exhausted; then the flow rate is 15 sccm. H 2 , raise the temperature of the tube furnace to 1050°C and keep it warm for 30min; 4 gas, the reaction time is 30min; stop feeding CH after the reaction is over 4 and H 2, turn off the heating voltage of the tube furnace, move the sample out of the constant temperature zone of the furnace ...

Embodiment 3

[0047] 1) A nickel-based single crystal superalloy is selected as the base material, with a diameter of 10 mm and a thickness of 0.5 mm. Use No. 600, No. 800 and No. 1000 sandpaper in turn to grind the surface of the sample to a roughness Ra of about 0.8.

[0048] 2) Put the polished alloy into ethanol and acetone and ultrasonically clean it for 5 minutes, take it out and dry it with nitrogen.

[0049] 3) Place the alloy on a quartz boat and place it in the constant temperature zone of the tube furnace. After the system is tested for tightness, argon gas with a flow rate of 300 sccm is introduced for 15 minutes to exhaust the air in the system; then argon gas with a flow rate of 20 sccm is introduced h 2 , raise the temperature of the tube furnace to 1050°C and keep it warm for 30min; 4 and Ar mixed gas, where CH 4 The volume concentration is 0.5%, and the reaction time is 300min; after the reaction, stop feeding CH 4 Mixed gas with Ar and H 2 , turn off the heating volta...

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Abstract

The invention relates to the field of high-temperature protective coatings, and discloses a diffusion-resistant layer at the interface between a single crystal superalloy and a coating. The novel diffusion-resistant layer includes a graphene film and a carburized layer; the preparation method of the diffusion-resistant layer is as follows: through chemical Vapor deposition method, deposit graphene film on the surface of single crystal superalloy substrate, and generate carburized layer inside the single crystal superalloy substrate, and then deposit MCrAlX on the surface of single crystal superalloy with graphene film by arc ion plating technology Coating; through the excellent ability of graphene to prevent element diffusion and the dispersed carbide formed by carbon and supersaturated refractory metal elements in the carburized layer, the stability of the alloy structure is improved, and the interdiffusion of elements is effectively inhibited, reducing or eliminating secondary The formation of the secondary reaction zone and the precipitation of the harmful phase of TCP prolong the service life of the single crystal superalloy / coating system.

Description

technical field [0001] The invention relates to the field of high-temperature protective coatings, in particular to a diffusion-resistant coating at the interface between a single crystal superalloy and a coating and a preparation method thereof. Background technique [0002] Nickel-based single crystal superalloys are the material basis for the development of aero-engines and are widely used in the manufacture of turbine blades. With the increase of the thrust-to-weight ratio of aero-engines, single crystal alloys need to be coated to improve the oxidation and corrosion resistance. MCrAlX is a widely used protective coating. Diffusion, resulting in a decrease in the content of effective protective elements, and the formation of an interdiffusion reaction layer and a secondary reaction zone containing TCP harmful phases at the interface, greatly reducing the mechanical properties of the single crystal matrix. [0003] Adding a diffusion barrier layer at the single crystal s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/26C23C8/20C23C14/16C23C14/32C23C28/00
CPCC23C8/20C23C14/16C23C14/325C23C16/26C23C28/30
Inventor 张儒静何利民牟仁德许振华李娜
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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