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Preparation method of Ni3Al coating

A kind of coating and cold spraying technology, which is applied in the direction of coating, metal material coating process, heating inorganic powder coating, etc., can solve the problems of insufficient reaction, complicated process control, short heating time, etc., and reach the coating thickness range Wide range, good process reproducibility, and a wide range of effects

Inactive Publication Date: 2021-08-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ni 3 Al is a typical intermetallic compound. Metal bonds and covalent bonds coexist in its crystal structure. It has both metal toughness and high-temperature performance of ceramics under high temperature conditions. Therefore, it has great development potential and application prospects. However, its disadvantage is that it is brittle at room temperature and difficult to form, which is the biggest obstacle restricting its engineering application.
The disadvantage of this method is that the heating time of Ni and Al powder in the plasma flame is short, the coating condensation process is short, and there is insufficient reaction. In addition, there are oxidation and relatively high porosity in the coating.
[0008] Some people in China use the method of co-electrodeposition of Ni and Al particles (average particle size is 1um), and then vacuum annealing at 600°C for 2h, in the ordinary coarse-grained Ni 3 A Ni alloy with an average grain size of 450 nm and a porosity of 6% was prepared on Al alloy 3 Al coating, this method adopts co-deposition method for pretreatment, and co-deposition has the characteristics of complicated process control. In addition, the coating porosity is high, which is not suitable for the service environment where the porosity is required to be less than 6%.

Method used

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  • Preparation method of Ni3Al coating
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The cold spraying equipment used is DYMET supersonic low-pressure cold air power spraying machine, the model is 423, and the base material used for spraying is 45 steel. Ni 3 The Al coating preparation process includes the following steps:

[0030] ① 45 steel needs to be pretreated before cold spraying. First cut the 45 steel plate into a square sample with a size of 20mm×20mm×4mm, polish it with 800-grit sandpaper, put it in acetone and ultrasonically clean it for 15 minutes, then rinse it with alcohol and dry it with cold air to remove surface oil and oxides, etc. Impurities.

[0031] ②Ni powder, Al powder, Al powder for cold spraying 2 o 3 The powder was dried in a drying oven at 70°C for 1 h to remove the moisture in the powder. Then crush the agglomerated powder to avoid poor fluidity caused by powder agglomeration during the cold spraying process. Fix the 45 steel substrate on the vise table in the spray booth.

[0032] ③Set the spraying process parameters ...

Embodiment 2

[0037] Steps 1.~2. are the same as Steps 1.~2. of Embodiment 1,

[0038] In step ③, the air temperature is set to 500°C, and the rest of the operations are the same as in the embodiment step ③

[0039] Step 4. is identical with embodiment 1 step 4.

[0040] The thickness of the coating obtained through the above steps is 165-170 μm (microns), and the average hardness is 253HV 0.2 , Compared with Example 1, the reason for the reduction in thickness is that the spraying temperature is reduced from 600°C to 500°C, which affects the deposition rate of the coating.

Embodiment 3

[0042] Steps ①~③ are the same as Steps ①~③ in Example 1

[0043] In step ④, the temperature of the heat treatment is set to 490°C, and the rest of the operations are the same as in step ④ of Example 1

[0044] The thickness of the coating prepared by the above steps is 170-180 μm (micron) and the average hardness of the coating is 238HV 0.2 , compared with Example 1, the reason for the decrease in hardness is that the holding temperature dropped from 500°C to 490°C, which affected the Ni in the coating. 3 The amount of Al produced.

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Abstract

The invention provides a preparation method of a Ni3Al coating. Compared with a thermal spraying method, the preparation method of the Ni3Al coating has the advantages that the prepared coating is higher in density and free of oxidation phenomenon, and can meet the wear-resistant and anti-oxidation requirements under high-temperature service conditions; compared with a physical vapor deposition method, the prepared coating has the advantage of being wide in thickness range; compared with a co-deposition Ni-Al heating treatment method, the preparation method overcomes the defects that a co-deposition process is complex and high in porosity; and the coating prepared through the method is high in Ni3Al content, good in process reproducibility and suitable for industrial production and wide in range of base materials, and spraying can be conducted on most metal surfaces.

Description

technical field [0001] The present invention relates to a kind of Ni 3 Preparation method of Al coating. Background technique [0002] Ni 3 Al is a typical intermetallic compound. Metal bonds and covalent bonds coexist in its crystal structure. It has both metal toughness and high-temperature performance of ceramics under high temperature conditions. Therefore, it has great development potential and application prospects. However, its disadvantage is that it is brittle at room temperature and difficult to form and process, which is the biggest obstacle restricting its engineering application. Therefore, people put Ni by preparing 3 Al intermetallic coating to overcome Ni 3 The brittleness problem of Al monolithic materials. Currently, it is used to prepare Ni 3 Al coating methods are: [0003] 1) Using magnetron sputtering method, [0004] Yuquan Ding and others from the University of Windsor in Canada prepared Ni-Al intermetallic compound coatings using physical vap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C23F17/00C22F1/10C22F1/02
CPCC23C24/085C23F17/00C22F1/10C22F1/02
Inventor 刘志凯揭晓华沈耿哲张留艳
Owner GUANGDONG UNIV OF TECH
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