A kind of iron-based amorphous-nanocrystalline composite coating and preparation method thereof

A nanocrystalline composite, iron-based amorphous technology, applied in coatings, metal material coating processes, etc., can solve the problems of reducing the corrosion resistance of the coating, low amorphous content of the coating, and poor corrosion resistance of the coating. , to achieve the effect of improving corrosion resistance, strong amorphous forming ability, and reducing preparation cost

Active Publication Date: 2018-12-18
NANCHANG HANGKONG UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, researchers at home and abroad have done extensive research on iron-based amorphous coatings. Most researchers used high-purity amorphous self-fluxing alloy powders to prepare amorphous-nanocrystalline composite coatings by laser cladding technology. However, the use of amorphous powder inevitably leads to the formation of pores in the coating, which reduces the corrosion resistance of the coating, and the amorphous-nanocrystalline composite coating prepared by the existing laser cladding technology has a low amorphous content. It will also lead to poor corrosion resistance of the coating
For example, Professor Katakam of the University of North Texas used laser cladding to prepare Fe on the surface of AISI4130 steel substrate. 48 Cr 15 Mo 14 C 16 B 6 Y 2 Amorphous coating, the resulting coating has high stability, but due to the existence of more nanocrystals in the coating, the coating has a low amorphous content, resulting in poor corrosion resistance of the coating

Method used

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  • A kind of iron-based amorphous-nanocrystalline composite coating and preparation method thereof
  • A kind of iron-based amorphous-nanocrystalline composite coating and preparation method thereof
  • A kind of iron-based amorphous-nanocrystalline composite coating and preparation method thereof

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Effect test

Embodiment 1

[0053] 20 grams each of the six raw materials of Fe-C, Fe-B, Fe-Cr, Co, Mo and Y were placed on the copper mold in the vacuum furnace. The components of these six raw materials are shown in Table 1. First vacuum the vacuum furnace to 1×10 -2 Pa, after changing high-purity argon for 3 times, adjust the vacuum to 1×10 -1 Pa, carry out the smelting of the alloy, in order to make the alloy smelting evenly, repeat the smelting 3 times, turn over the alloy at the end of each smelting, adopt the mode of cooling with the furnace to lower the temperature, and obtain the composition of Fe 44.5 co 8.5 Cr 14 Mo 26 C 3 B 1 Y 3 smelting alloys. The obtained smelted alloy was cut into 20mm×20mm×0.2mm samples, and 2mm thick low-carbon alloy steel was selected as the base material.

[0054] Sandpaper is used to grind the surface of the smelted alloy sample and the low-carbon alloy steel, after removing the oxide layer on the surface, cleaning with absolute ethanol and drying to obtain ...

Embodiment 2

[0061] The smelted alloy is prepared in the same manner as in Example 1, the obtained smelted alloy composition is consistent with the alloy composition in Example 1, and the composite coating is obtained by smelting in the same manner as in Example 1. The difference with Example 1 is that the laser During the cladding process, the laser power is 19.2w, the pulse frequency is 0.5Hz, the pulse width is 5.0ms, and the laser energy density is 104J / mm 2 , the pulse energy is 7.3J, the cladding rate is limited to 0.3mm / s, and the superposition rate is 50%.

Embodiment 3

[0063] The smelted alloy is prepared in the same manner as in Example 1, the obtained smelted alloy composition is consistent with the alloy composition in Example 1, and the composite coating is obtained by smelting in the same manner as in Example 1. The difference with Example 1 is that the laser During the cladding process, the laser power is 19.2w, the pulse frequency is 1.0Hz, the pulse width is 5.0ms, and the laser energy density is 104J / mm 2 , the pulse energy is 7.3J, the cladding rate is limited to 0.3mm / s, and the superposition rate is 50%.

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Abstract

The invention provides an iron-based amorphous-nanocrystalline composite coating and a preparation method thereof, which comprises 44-45wt% of Fe, 8-9wt% of Co, 10-15wt% of Cr, 25- A molten alloy of 27wt% Mo, 3-5wt% C, 1-2wt% B and 1-3wt% Y is coated on the base material to obtain a composite coating. In the method provided by the invention, alloy melting is used in the cladding process, and high-purity amorphous self-fluxing powders of conventional raw materials are avoided by laser melting, thereby avoiding the generation of pores formed by amorphous self-fluxing powders and ensuring a compact structure. The composite coating improves the corrosion resistance of the composite coating; the smelted alloy used has a strong ability to form amorphous, and the coating obtained by cladding has a high amorphous content.

Description

technical field [0001] The invention belongs to the technical field of composite coatings, in particular to an iron-based amorphous-nanocrystalline composite coating and a preparation method thereof. Background technique [0002] Cladding metal coating is the main method of steel protection, but common Zn, Al and Zn-Al coatings at home and abroad are sensitive to Cl- and have low corrosion resistance, which can no longer fully meet the needs of harsh environments. High-performance amorphous coatings The research and application of the layer has aroused the close attention of the material circles in various countries. Fe-based amorphous alloy coatings have been used in ships, nuclear power, petroleum and other fields due to their high hardness, excellent wear resistance and corrosion resistance. [0003] Laser cladding (Laser Cladding) is a surface modification technology with the advantages of high energy density, low heat input, and fast cooling rate. It is a common method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C30/00C22C45/02
CPCC22C30/00C22C37/06C22C45/02C23C24/103
Inventor 王善林龚玉兵柯黎明陈玉华黄永德
Owner NANCHANG HANGKONG UNIVERSITY
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