Method for preparing compound coat between metals

A technology of intermetallic compounds and coatings, which is applied in the fields of electric power, machinery, material processing, aerospace, chemical industry, and metallurgy. Layer bonding strength, unfavorable service life and other problems, to achieve the effect of industrial application, low production cost and high output

Active Publication Date: 2007-10-24
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding between the layers of these particles is not completely bonded, but presents a limited bonding state. Therefore, it has an adverse effect on the bonding strength and service life of the coating, and cannot fully utilize the properties of the intermetallic compound material itself.
Secondly, when nanostructured powders are used for heating and melting thermal spraying, the occurrence of melting will cause the nanostructure of the powder to disappear, so that the resulting coating cannot effectively obtain the desired nanostructure.
In addition, it is possible to avoid the problem of nanostructure disappearance by cold spraying. However, since cold spraying deposits coatings at lower temperatures and intermetallics have significant low-temperature brittleness, it is usually impossible to achieve intermetallic coatings by cold spraying. layer preparation

Method used

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  • Method for preparing compound coat between metals
  • Method for preparing compound coat between metals
  • Method for preparing compound coat between metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] After the sandblasting pretreatment of the substrate, for the specific intermetallic compound FeAl, select iron powder and aluminum powder in a molar ratio of 1:1 for proportioning. The 1:1 mentioned here is a theoretical ratio, because the intermetallic compound The composition ratio is generally within a certain range corresponding to a certain temperature, so the specific and accurate value of the ratio can be within a certain range according to the coating temperature requirements and the composition ratio of specific intermetallic compounds. Then add 5wt% tungsten carbide ceramic powder to form the initial mixed powder. The three original powders are shown in Figure 1. Put the powder into a ball mill jar with argon as the protective atmosphere, the ratio of ball to material is 5:1, and the speed is 250 rpm. After 30 hours of ball milling, the powder is taken out, and the powder with a particle size of about 10 microns is obtained by sub-sieving. The surface morpholo...

Embodiment 2

[0043] After sandblasting pretreatment of the substrate, for specific intermetallic compounds Fe 3 Al, select iron powder and aluminum powder according to the molar ratio of 3:1 to make a total of 300g, NiTi intermetallic compound particles 100g, alumina ceramic powder 100g to form the initial mixed powder, put it into a ball mill tank and add ethanol as a process control agent , the ratio of ball to material is 10:1, the speed is 200 rpm, the powder is taken out after ball milling for 25 hours, and the powder with a particle size of about 25 microns is obtained by sub-sieving. Nanostructured Fe-Al intermetallic coatings.

Embodiment 3

[0045] After sandblasting pretreatment of the substrate, for the specific intermetallic compound TiAl, select titanium powder and aluminum powder in a molar ratio of 1:1, then add 15wt% boron nitride ceramic powder to form the initial mixed powder, and pack it into Stearic acid is added into the ball mill tank as a process control agent, the ball-to-material ratio is 30:1, and the rotating speed is 150 rpm. It is taken out after ball milling for 40 hours, and the powder with a particle size of about 35 microns is obtained by sub-sieving. The coating is deposited by cold spraying. The coating was heat-treated at 850°C for 15 hours to obtain a nanostructure titanium-aluminum intermetallic compound coating.

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Abstract

The invention discloses a making method of intermetallic compound coating in the material manufacturing, aeronautical and spatial, metallurgical, electric, mechanic and chemical domain, which is characterized by the following: adopting two or more multiple metal powder as raw material to prepare alloy powder through mechanic alloying method; coating the powder on the sediment layer of base; obtaining the product through heat dispersing alloying disposal; transplanting the phase structure of powder into coating; dispersing fitfully to obtain the product.

Description

technical field [0001] The invention relates to the fields of material processing, aerospace, metallurgy, electric power, machinery, chemical industry, etc., and relates to a preparation method of an intermetallic compound coating. performance intermetallic coating. Background technique [0002] The development of modern industry has put forward higher requirements for industrial products in aerospace, chemical industry, electric power, metallurgy and other industries, requiring products to serve for a long time under harsh working conditions, which directly puts forward higher requirements for product surface properties. For example: in the petrochemical industry, the working temperature of some equipment is as high as 1000 ℃, and the working environment is concentrated hydrogen sulfide and strong corrosive gas. High temperature corrosion greatly reduces the service life of these equipment; currently, the thermal power circulating fluidized bed boil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C21D1/00
Inventor 李长久杨冠军王洪涛
Owner XI AN JIAOTONG UNIV
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