Preparation method for diffusion impervious layer suitable for large member
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A technology for large-scale components and barrier layers, which is applied in the field of diffusion barrier preparation, can solve problems such as surface coating failure and interdiffusion, and achieve the effects of high production efficiency, low raw material cost, and strong process adaptability
Active Publication Date: 2021-02-05
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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[0002]Some coatings need to maintain their own functionality during high temperature service, but under high temperature for a long time, there will be a gap between the coating and the base material Interdiffusion, leading to surface coating failure
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Embodiment 1
[0028] The invention provides a method for preparing a diffusion barrier layer suitable for large components, characterized in that: the method for preparing a diffusion barrier layer suitable for large components specifically includes the following steps:
[0029] Aluminizing agent preparation:
[0030] Put the aluminum and iron blocks into the container, add ammonium bifluoride with a mass percentage of 0.5% to 1.0% of the aluminum and iron blocks, and then add water until it covers the surface of the aluminum and iron blocks, then heat in a heating furnace and keep it at 270 to 330°C. until it is boiled dry; a roasting at 700-900°C is carried out between two activation treatments;
[0031] Degreasing:
[0032] Clean the parts and components that need aluminizing, including samples, with organic solvents to clean the surface dirt and oil;
[0033] Liquid blasting:
[0034] Before aluminizing, the components need to be sand blasted by liquid, and the wind pressure should n...
Embodiment 2
[0046] The invention provides a method for preparing a diffusion barrier layer suitable for large components, characterized in that: the method for preparing a diffusion barrier layer suitable for large components specifically includes the following steps:
[0047] Aluminizing agent preparation:
[0048] Put the aluminum and iron blocks into the container, add ammonium bifluoride with a mass percentage of 0.5% to 1.0% of the aluminum and iron blocks, and then add water until it covers the surface of the aluminum and iron blocks, then heat in a heating furnace and keep it at 270 to 330°C. until it is boiled dry; a roasting at 700-900°C is carried out between two activation treatments;
[0049] Degreasing:
[0050] Clean the parts and components that need aluminizing, including samples, with organic solvents to clean the surface dirt and oil;
[0051] Liquid blasting:
[0052] Before aluminizing, the components need to be sand blasted by liquid, and the wind pressure should n...
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Abstract
The invention relates to a preparation method for a diffusion impervious layer suitable for a large member. The preparation method comprises the following steps: preparation of an aluminizing medium:packing an alumiumn and iron block in a container, adding ammonium hydrogen fluoride which accounts for 0.5-1.0% by mass of aluminum and iron block, then adding water till inundating the surface of the aluminum and iron block, then heating the aluminum and iron block in a heating furnace and keeping the temperature at 270-330 DEG C till the mixture is boiled away; performing roasting at 700-900 DEG C between activating treatment twice; deoiling: cleaning surface dirt and oil stains of parts and assemblies, including test samples, needed to be aluminized with an organic solvent thoroughly; liquid sand-blowing: performing liquid sand-blowing on the parts and assemblies before aluminizing, wherein the air pressure does not exceed 0.3 MPa; and gas phase aluminizing: keeping the temperature for1-3.5 hours at 900-1050 DEG C, wherein the relative pressure in the furnace is controlled at 0.002-0.01 Mpa. The method has the advantages that a formed aluminum oxide impervious layer is intact, continuous and compact and exists stably at a high temperature for a long time, can be used for preparing the diffusion impervious layer of the large member, and is low in cost of raw materials, simple in process and high in production efficiency.
Description
technical field [0001] The present invention relates, in particular, to a method for preparing a diffusion barrier suitable for large components. Background technique [0002] Some coatings need to maintain their own functionality during high-temperature service, but under high-temperature and long-term conditions, interdiffusion will occur between the coating and the base material, resulting in failure of the surface coating. Therefore, it is necessary to prepare a diffusion barrier layer between the substrate material and the surface coating to effectively prevent the interdiffusion between the coating and the substrate and ensure the performance of the coating. Contents of the invention [0003] The purpose of the present invention is to form a stable, continuous, dense and complete aluminum oxide film between the base metal and the surface coating, effectively prevent the interdiffusion of the base material and the surface coating, and maintain the surface coating itse...
Claims
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