High-temperature preventive coating process

A technology of protective coating and process method, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of insufficient ability of the coating to resist gas corrosion, achieve the improvement of process and labor conditions, and extend the overhaul cycle, high temperature oxidation and corrosion resistance superior effect

Inactive Publication Date: 2010-06-09
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The coating obtained by the traditional process method is insufficient in the ability to resist gas corrosion. The present invention provides a high-temperature protective coating process method, which is to add aluminum, silicon and chromium-containing materials into the infiltrating agent. A high-temperature protective seepage layer with high chromium content obtained by curing and vacuum high-temperature diffusion

Method used

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  • High-temperature preventive coating process

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Embodiment 1

[0016] This embodiment provides a high-temperature protective coating process. The process flow is: preparation of adhesive → batching slurry → spraying → curing → heating in a vacuum furnace; the composition and mass ratio of the adhesive are: water: 800g, three Chromium oxide: 70g, magnesium oxide: 80g, phosphoric acid: 350g; the binder preparation process is: add phosphoric acid in water → add magnesium oxide and fully dissolve → add chromium trioxide; the step of adding magnesium oxide and fully dissolving is to use a small amount of The principle of adding multiple times is to add a small amount first, and then add again after it becomes clear easily.

[0017] The high-temperature protective coating process described in this embodiment, the batching slurry is according to the following ratio and process: take binder: 800g → add aluminum powder: 500g → add zinc powder: 100g → fully stir and mix.

[0018] The high-temperature protective coating process described in this emb...

Embodiment 2

[0021] This embodiment provides a high-temperature protective coating process. The process flow is: preparation of binder → batching slurry → spraying → heating in a vacuum furnace; wherein the binder composition and mass ratio are: water: 700g, chromium trioxide : 60g, magnesia: 70g, phosphoric acid: 270g; the binder preparation process is: add phosphoric acid in water → add magnesia and fully dissolve → add chromium trioxide; the step of adding magnesia and fully dissolving is to use a small amount of multiple times The principle of adding is to add a small amount first, and then add again after the solution becomes clear.

[0022] The high-temperature protective coating process described in this embodiment, the batching slurry is according to the following ratio and process: take binder: 700g → add aluminum powder: 450g → add zinc powder: 110g → fully stir and mix.

[0023] The high-temperature protective coating process described in this embodiment uses 0.2-0.3MP air press...

Embodiment 3

[0026] This embodiment provides a high-temperature protective coating process. The process flow is: preparation of binder → batching slurry → spraying → curing → heating in a vacuum furnace; wherein the binder composition and mass ratio are: water: 900g, three Chromium oxide: 90g, magnesium oxide: 90g, phosphoric acid: 400g; the binder preparation process is: add phosphoric acid in water → add magnesium oxide and fully dissolve → add chromium trioxide; the step of adding magnesium oxide and fully dissolving is to use a small amount of The principle of adding multiple times is to add a small amount first, and then add again after the solution becomes clear.

[0027] The high-temperature protective coating process method described in this embodiment, the proportion and process of the batching slurry are as follows: take binder: 900g → add aluminum powder: 600g → add zinc powder: 120g → fully stir and mix.

[0028] The high-temperature protective coating process described in this...

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Abstract

The invention relates to a high-temperature preventive coating process which is characterized by comprising the process flows of: preparing a caking agent, preparing slurry, spraying, solidifying and heating in a vacuum furnace, wherein the caking agent comprises the following ingredients in mass ratio: 700 to 900g of water, 60 to 90g of chromium trioxide, 70 to 90g of magnesium oxide and 270 to 400g of phosphoric acid; a preparation process of the caking agent comprises the following steps of: adding the phosphoric acid in water, adding the magnesium oxide and fully dissolving, and adding the chromium trioxide, wherein the step of adding the magnesium oxide and fully dissolving adopts a principle of adding in small amount and a plurality of times, that is to say, adding in small amount and then adding again after the solution become clear. The invention changes the traditional process flow, improves the coating performance, can be applied to components and parts that work for a long time in severe environment, and is particularly suitable for a gas turbine.

Description

technical field [0001] The invention relates to chemical coating protection and anti-corrosion process science, and particularly provides a high-temperature protective coating process method. Background technique [0002] The solid aluminized layer appeared in the 1950s, and it is still widely used in the aviation manufacturing industry. The typical solid aluminizing process is to add 1-3% ammonium chloride to the aluminum-iron alloy powder to make the infiltration agent, bury the parts in the powder infiltration agent, and form a NiAl phase on the surface after high-temperature diffusion treatment. The main purpose of the infiltration layer is to improve the oxidation resistance of the parts, but due to the diffusion of aluminum atoms into the matrix, the chromium atoms in the surface layer are "squeezed" to the subsurface, so that the chromium atoms in the outer layer of the infiltration layer Reduction will affect the thermal corrosion resistance. The aluminide coating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/52
Inventor 张凡云张尊礼李辰辉冯瑞亮郭殿品牛静史凤岭李红梅
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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