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Preparation method for high-entropy alloy coating

A high-entropy alloy and coating technology, applied in metal material coating process, coating, heating inorganic powder coating and other directions, can solve the problems of slag inclusion in pores, uneven formation of coating structure, and large thermal deformation of the substrate. , to achieve excellent wear resistance, hinder dislocation slip, and increase strain energy.

Active Publication Date: 2016-04-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method requires a large laser, and the production cost is high; at the same time, the temperature difference between the outer edge and the inner edge of the laser spot of laser cladding is large, the coating structure is unevenly formed, and the stress distribution is uneven, resulting in uneven hardness of the coating and floating gas. If the slag is not sufficient, it is easy to form pore slag inclusions; in addition, due to the different absorption capabilities of different materials for different wavelength lasers, the selection of materials for laser cladding is limited.
In addition, the deposition rate of magnetron sputtering is high, the alloy composition is easy to control, and thin films can be prepared, but it has high requirements on the target material, expensive instruments, cannot be produced on site, the production cost is high, and it is impossible to prepare coatings with a thickness of mm.
Plasma cladding heat input is large, resulting in large thermal deformation of the substrate; the coating obtained after cladding has high porosity and poor density, and the coating is easy to fall off from the substrate surface; and plasma cladding requires large-scale special equipment, and the preparation cost is relatively high. high

Method used

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  • Preparation method for high-entropy alloy coating
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  • Preparation method for high-entropy alloy coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select Q235 steel as the base material, including the following steps:

[0034] Step (1): Coating powder preparation: Co, Cr, Fe and Ni metal powders with a particle size of 75 μm and a purity of not less than 99.5% by mass are mixed in a molar ratio of 1:1:1:1 to obtain Coating powder.

[0035] Step (2): Put the coating powder in a planetary ball mill, wherein, the rotating speed: 200-400r / min, the ball-material ratio: 10:1-20:1, the time: 180-220h; the obtained particle size is 5- 15 μm high entropy alloy powder.

[0036] Step (3): Pretreatment of the Q235 metal substrate: Cut the surface of the substrate with a milling machine to remove the oxide layer until the metallic luster is exposed and the surface of the substrate is smooth; then clean the surface of the substrate with absolute ethanol, clean After finishing, rinse with distilled water and dry for later use.

[0037] Step (4): Pre-place the high-entropy alloy powder prepared in step (2) on the surface of th...

Embodiment 2

[0045] Select Q235 steel as the base material, including the following steps:

[0046] Step (1): Prepare coating base material: Co, Cr, Fe and Ni metal powders with a particle size of 75 μm and a purity of not less than 99.5% by mass, and mix them in a molar ratio of 1:1:1:1 to obtain Coating powder.

[0047] Step (2): Put the coating powder in a planetary ball mill, wherein: the rotating speed is 200-400r / min, the ball-to-material ratio is 10:1-20:1, and the time is 180-220h; obtain a high particle size of 5-15μm Entropy alloy powder.

[0048] Step (3): Pretreatment of the Q235 metal substrate: Cut the surface of the substrate with a milling machine to remove the oxide layer until the metallic luster is exposed and the surface of the substrate is smooth; then clean the surface of the substrate with absolute ethanol, clean After finishing, rinse with distilled water and dry for later use.

[0049] Step (4): Pre-place the high-entropy alloy powder prepared in step (2) on the...

Embodiment 3

[0056] Table 1 Mole percentage of Co, Cr, Fe, Ni

[0057]

[0058] ; According to the atomic percentage distribution material in Table 1, the coating powder is prepared; other operations are the same as in Example 1. The appearance of the prepared high-entropy alloy coating is consistent with that of Example 1, the hardness is 440-460HV, and the friction coefficient is about 0.35-0.42.

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Abstract

The invention relates to a preparation method for high-entropy alloy coating, and belongs to the technical field of alloy coating preparation. The preparation method comprises the following steps: placing high-entropy alloy powder presenting a single face-centered cubic structure on the surface of a steel base material; sintering by utilizing a vacuum hotpressing sintering furnace: firstly, adjusting the vacuum degree of a furnace chamber to be 1.0*10<-3> Pa, then rising the temperature to 800-1,000 DEG C with the temperature rising speed of 5-10 K / min, controlling the sintering pressure to be 20-40 Mpa, and sintering for 30-90 min. According to the preparation method, the high-entropy alloy powder presenting the single face-centered cubic structure is used as a raw material, the manner of vacuum hotpressing sintering which is simple in operation and common in used equipment is adopted for the first time to prepare the excellent high-entropy alloy coating; through control of the sintering process, the prepared CoCrFeNi coating still keeps the single face-centered cubic structure, and the hardness and the wear resistance of the coating are obviously improved.

Description

technical field [0001] The invention relates to a method for preparing a high-entropy alloy coating, and belongs to the technical field of alloy coating preparation. Background technique [0002] In 2004, two scholars, Ye Junwei and CantorB, took the lead in breaking through the traditional research framework, and almost simultaneously proposed a new alloy design theory, that is, multi-principal high-entropy alloys. It is composed of five or more elements, the atomic ratio is 1:1 or approximately 1:1, and the composition of each element is between 5% and 35%. Due to the high entropy value and the characteristics of difficult diffusion of atoms, high-entropy alloys are not easy to form complex structures such as intermetallic compounds after solidification, but instead form simple face-centered cubic or body-centered cubic phases. At the same time, there are usually nano-precipitated The substance is equal to the amorphous, and its characteristics are obviously better than t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C22C30/00
CPCC22C30/00C23C24/087
Inventor 王艳商彩云葛文娟张子堂
Owner UNIV OF JINAN
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