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Method for aluminizing and chromizing surface of nickel-based high-temperature alloy used on turbine blade or guider

A nickel-based high-temperature alloy and turbine blade technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of limited corrosion resistance of aluminized coating, unable to guarantee supply, etc., and achieve superior performance , good thermal corrosion resistance effect

Inactive Publication Date: 2021-04-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, aero-engine blades are mainly improved by aluminizing treatment to improve high-temperature resistance, but the improvement of corrosion resistance of aluminized coatings is limited; aluminum-chromium co-infiltration improves high-temperature corrosion resistance and high-temperature oxidation resistance at the same time However, at present, the procurement of aluminum-chromium co-infiltration agent mainly depends on imports, and its continuous and stable supply cannot be guaranteed. Therefore, it is very necessary to develop domestic aluminum-chromium co-infiltration agent and its coating preparation method

Method used

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  • Method for aluminizing and chromizing surface of nickel-based high-temperature alloy used on turbine blade or guider
  • Method for aluminizing and chromizing surface of nickel-based high-temperature alloy used on turbine blade or guider
  • Method for aluminizing and chromizing surface of nickel-based high-temperature alloy used on turbine blade or guider

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]The aluminum chrome method of this embodiment is carried out as follows:

[0023]1, the infiltration configuration, with a mass ratio, the raw material powder, the alumina powder content of 50%, the chrome powder content of 39%, the aluminum powder content of 10%, 1% ammonium chloride; and use a drum type The ball mill grinds the powder ball for 9.5 h to give a mixed bleeding.

[0024]2, pretreatment of bleging agent: calcine the ball after milling, the calcination temperature is controlled at 1100 ° C, and the holding time is controlled at 15.5 h, after the calcination is completed, the chamber is cooled. Then, in the baked bure agent, add a relative raw material total amount of aluminum powder, 1% chromium powder and 0.4% NH.4CL; then bleed at 1030 ° C for 11 h, after the air was burned, the furnace was cooled to give a sample.

[0025]3, parts pretreatment: Totally blow up the part with 200 目 砂, pressure 0.28MPa, after blowing, the blower cleans the surface residual sand, obtains th...

Embodiment 2

[0036]1, the infiltration configuration, with a mass ratio, the raw material powder, the alumina powder content of 50%, the chrome powder content of 44%, the aluminum powder content of 5%, 1% ammonium chloride content; and use roller type The ball mill grinds the powder ball for 9.5 h to give a mixed bleeding.

[0037]2, pretreatment of bleging agent: calcine the ball after milling, the calcination temperature is controlled at 1100 ° C, and the holding time is controlled at 15.5 h, after the calcination is completed, the chamber is cooled. Then, in the baked bure agent, add a relative raw material total amount of aluminum powder, 1% chromium powder and 0.4% NH.4CL; then bleed at 1030 ° C for 11 h, after the air was burned, the furnace was cooled to give a sample.

[0038]3, parts pretreatment: Totally blow up the part with 200 目 砂, pressure 0.28MPa, after blowing, the blower cleans the surface residual sand, obtains the pretreatment parts, the parts in this example are nickel groups. High...

experiment example 2

[0048]The results of the corrosion resistance test of the experimental example 2 and the contraction example 2 are shown in Table 2.

[0049]Table 2

[0050] Example 2 Contrast 2 Corrosion potential -1.32-1.89

[0051]From the experimental results, the corrosion resistance performance of Experimental Example 2 is superior to Comparative Example 2. Further, the diffusion of the permeability layer of the contraction is uneven, and some are crackled.

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Abstract

The invention discloses a method for aluminizing and chromizing the surface of a nickel-based high-temperature alloy used on a turbine blade or a guider. The method comprises the following steps: 1) preparing an aluminizing and chromizing agent; 2) pretreating the agent; 3) pretreating a part; 4) carrying out aluminizing and chromizing; and 5) post-treating the part containing an aluminum-chromium coating. The method mainly aims at the situation that in an environment with hot corrosion as a main damage form, chromium element can quickly generate a stable chromate layer, so that a single chromized layer and an aluminized and chromized layer have better hot corrosion resistance than a single aluminized layer. The oxidation resistance and the hot corrosion resistance are considered, and the aluminized and chromized layer has the optimal comprehensive corrosion resistance. According to the invention, a special formula and a unique atmosphere protection method are adopted, and the part is subjected to sufficient pretreatment and post-treatment, so that the obtained infiltrated layer has more excellent performance than an infiltrated layer manufactured by an existing method.

Description

Technical field[0001]The present invention belongs to the technical field of surface treatment of metal materials, and more particularly to a method of surface aluminum chromium having a nickel-based high-temperature alloy for a turbine blade or a guide.Background technique[0002]The metal permeation process is a chemical heat treatment process in which a plurality of metal atoms penetrates into the surface layer of the metal object, placing the metal object into a joy of the elementally penetrating, heats the medium to a certain temperature, in the infiltration The atoms of the elements that need to be penetrated will diffuse into the metal object substrate.[0003]Aluminum chromium alloy is mainly used for aerospace engine blades. Since the temperature at which the air engine gas turbine gas inlet can reach 1600 °, and the operating temperature of the air engine blade can reach more than 1200 °, the aeroengi needs to operate in an extremely harsh environment. Therefore, it is necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/56
CPCC23C10/56
Inventor 袁铁锤唐皓州李瑞迪
Owner CENT SOUTH UNIV
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