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Slurry method aluminizing method for aero-engine high-temperature alloy

A technology for aero-engines and high-temperature alloys, applied in metal material coating processes, coatings, solid-state diffusion coatings, etc., can solve problems such as discontinuous penetration and uneven thickness, improve high-temperature oxidation resistance, and prolong service life The effect of longevity

Inactive Publication Date: 2019-02-01
AECC AERO SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The conventional slurry aluminizing method is mostly used for carbon steel or alloy steel substrates. For high-temperature alloy slurry aluminizing, there are problems such as discontinuous permeated layer and uneven thickness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The slurry method aluminizing method for aero-engine superalloys of the present invention comprises the following steps:

[0026] Step 1: Prepare aluminum powder paste. In the aluminum powder slurry, the mass ratio of the aluminum powder to acetone ranges from 1 to 4:1; mixing and stirring are performed to dissolve and form the aluminum powder slurry.

[0027] In this step, the aluminum powder slurry is mixed and stirred for at least half an hour to dissolve and form the aluminum powder slurry.

[0028] Step 2: Configure the slurry.

[0029] Mix isoamyl acetate and nitro varnish at a volume ratio of 4:1 to prepare an adhesive, and then add aluminum powder slurry to prepare a slurry, wherein 250-300g of aluminum powder is added to every 1000mL of slurry.

[0030] Step 3: Stir the slurry so that the viscosity of the slurry is 16-22s.

[0031] The slurry should be rolled and stirred in a sealed container for more than 72 hours, and then the viscosity of the slurry shoul...

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Abstract

The invention provides a slurry method aluminizing method for an aero-engine high-temperature alloy. According to the method, after aluminum powder, nitrocellulose varnish, isopentyl acetate and the like are adopted for preparing slurry according to a certain method, a thickness-uniform and continuous aluminizing layer is formed on the surface of the high-temperature alloy according to the washing-sand blowing-spraying-vacuum diffusing heat treatment process. According to the slurry method aluminizing method for the aero-engine high-temperature alloy, the 30-120 micron uniform and continuous aluminizing layer can be generated as required, and the purposes of improving the high-temperature oxidization resisting performance of a base body and prolonging the service life are achieved.

Description

technical field [0001] The invention belongs to the field of surface protection of aero-engine parts, and is mainly used for a method of aluminizing aero-engine high-temperature alloy parts by slurry method. Background technique [0002] Aluminizing is a chemical heat treatment process in which one or more metal atoms penetrate into the surface of a metal workpiece. The metal workpiece is placed in an infiltrating agent containing infiltrated metal elements. After the medium is heated to a certain temperature, the aluminum atoms penetrate and diffuse into the Processes in a steel matrix. [0003] The slurry method aluminizing is to adjust the solid aluminizing agent and binder into a slurry, coat it on the surface of the workpiece, and heat and diffuse aluminizing. After aluminizing, an iron-aluminum alloy layer with special properties is formed on the surface, thereby improving the oxidation resistance and corrosion resistance of the material. The aluminizing method has b...

Claims

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Application Information

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IPC IPC(8): C23C10/30
CPCC23C10/30
Inventor 黎红英陈秋娟柳卫李洪钊王峰李腾
Owner AECC AERO SCI & TECH CO LTD