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Diffusion-resistant high-entropy alloy coating material, high-temperature-resistant coating material, preparation method and application thereof

A high-entropy alloy and coating material technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the problems of poor physical matching of substrates, poor blocking effect, poor chemical matching and so on , to extend the service life, improve the resistance to diffusion, and improve the resistance to high temperature oxidation.

Active Publication Date: 2021-08-31
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the diffusion barrier materials are mainly metals (noble metals or refractory metals) and ceramics, but the metal diffusion barrier has the problem of poor chemical matching with the coating / substrate, and its retardation effect is not good when multiple elements are interdiffused at the same time ; while the diffusion barrier of the ceramic layer has the problem of poor physical matching with the substrate, and is prone to thermal shock failure

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  • Diffusion-resistant high-entropy alloy coating material, high-temperature-resistant coating material, preparation method and application thereof
  • Diffusion-resistant high-entropy alloy coating material, high-temperature-resistant coating material, preparation method and application thereof
  • Diffusion-resistant high-entropy alloy coating material, high-temperature-resistant coating material, preparation method and application thereof

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preparation example Construction

[0026] S1. Preparation of diffusion-resistant high-entropy alloy coating materials

[0027] A diffusion-resistant high-entropy alloy coating is formed on the surface of the substrate, and the elements of the diffusion-resistant high-entropy alloy coating include Al, Co, Cr, Ni and Mo. The invention found that the high-entropy alloy coating formed by the above five elements can effectively inhibit the interdiffusion of alloy components between the substrate and other coatings (especially high-temperature coatings) and the precipitation of harmful phases at the interface, and improve the high-temperature oxidation resistance of the coating. At the same time, it avoids the reduction of the mechanical properties of the base material caused by interdiffusion, and prolongs the service life of the parts. If the elements therein are replaced, such as replacing Co with Ti, such a good diffusion resistance effect cannot be achieved at all.

[0028] Further, by atomic percentage, the el...

Embodiment 1

[0040] This embodiment provides a method for preparing a high temperature resistant coating material, which is prepared by the following method:

[0041] (1) Target material preparation: Al, Co, Cr, Ni and Mo metal powders are uniformly mixed according to the atomic percentage ratio of 1:1:1:1:1, and a single alloy prepared by powder metallurgy is used as the target material .

[0042] (2) Substrate pretreatment: using nickel-based superalloy (N5) as the substrate, the surface of the substrate is ground and polished, then ultrasonically cleaned with acetone, alcohol and deionized water, and dried.

[0043] (3) Diffusion-resistant coating deposition: Magnetron sputtering is used to deposit a high-entropy alloy coating on the surface of the cleaned substrate. The process parameters are: the background vacuum is less than 5×10 -3 Pa, the substrate temperature is 200°C, the target power is 250W, the substrate DC bias is -100V, the duty cycle is 70%, the target-base distance is 12...

Embodiment 2

[0046] This embodiment provides a method for preparing a high-temperature-resistant coating material, which differs from Embodiment 1 only in that in step (3), the process parameters for coating deposition are: the background vacuum is less than 5×10 -3 Pa, substrate temperature 150°C, target power 300W, substrate DC bias voltage -300V, duty cycle 90%, target-base distance 10cm, working argon gas pressure 0.8Pa, ion source 1.2A. The control coating thickness is 4 μm.

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Abstract

The invention discloses a diffusion-resistant high-entropy alloy coating material, a high-temperature-resistant coating material, a preparation method and an application thereof, and relates to the technical field of coating preparation. The diffusion-resistant high-entropy alloy coating material includes a base material and a diffusion-resistant high-entropy alloy coating, and the elements of the diffusion-resistant high-entropy alloy coating include Al, Co, Cr, Ni and Mo. The high-temperature-resistant coating material and its preparation method form the above-mentioned diffusion-resistant high-entropy alloy coating on the substrate, and then use this as the material body to form a high-temperature-resistant coating, and utilize the unique slow diffusion effect of the diffusion-resistant high-entropy alloy coating. And it has good physical and chemical matching with the substrate and the high-temperature resistant coating, which can effectively inhibit the interdiffusion of alloy components between the substrate and the coating and the precipitation of harmful phases at the interface, and improve the high-temperature oxidation resistance of the coating. The high-temperature-resistant coating material can be applied in the preparation of hot-end parts of aero-engines or gas turbines, thereby improving the service life and working reliability of the parts.

Description

technical field [0001] The invention relates to the technical field of coating preparation, and in particular to a diffusion-resistant high-entropy alloy coating material, a high-temperature-resistant coating material and a preparation method and application thereof. Background technique [0002] Aeroengine or gas turbine turbine blades are used in harsh environments, and their operating temperature is extremely high, which has far exceeded the limit temperature that superalloy materials can withstand. Therefore, high-temperature protective coatings must be used to meet the operating temperature and effectively extend the service life of components. However, due to the large difference in microstructure between the coating material and the superalloy substrate, interdiffusion of elements between the coating and the alloy substrate will inevitably occur during high temperature service. Among them, the main anti-oxidation element Al of the coating diffuses into the substrate, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/02C22C30/00C23C14/16C23C14/32C23C14/35
CPCC23C28/021C22C30/00C23C14/35C23C14/325C23C14/165C23C14/16
Inventor 汪唯许中湛王磊洪悦石倩林松盛郭朝乾唐鹏苏一凡代明江王红莉唐春梅
Owner GUANGDONG INST OF NEW MATERIALS
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