Iron-based amorphous-nanocrystal 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 low amorphous content of coatings, poor corrosion resistance of coatings, and reduced corrosion resistance of coatings. , to achieve the effect of strong amorphous formation ability, improved corrosion resistance and improved organizational uniformity

Active Publication Date: 2017-01-04
NANCHANG HANGKONG UNIVERSITY
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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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  • Iron-based amorphous-nanocrystal composite coating and preparation method thereof
  • Iron-based amorphous-nanocrystal composite coating and preparation method thereof
  • Iron-based amorphous-nanocrystal composite coating and preparation method thereof

Examples

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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-nanocrystal composite coating and a preparation method thereof. The preparation method of the iron-based amorphous-nanocrystal composite coating comprises the step that smelted alloy comprising 44-45 wt% of Fe, 8-9 wt% of Co, 10-15 wt% of Cr, 25-27 wt% of Mo, 3-5 wt% of C, 1-2 wt% of B and 1-3 wt% of Y is smeared onto a base material, so that the composite coating is obtained. According to the preparation method provided by the invention, the smelted alloy is adopted in the fusion cladding process, the process of smelting high-purity amorphous self-melting powder of conventional raw materials in a laser way is omitted, holes formed by generation of the amorphous self-melting powder are avoided accordingly, it is ensured that the composite coating of a compact structure is obtained, and the corrosion resistance of the composite coating is improved; and the amorphous forming ability of the adopted smelted alloy is high, and the amorphous content of the coating obtained through fusion cladding is high.

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 Applications(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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