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Laser-cladding high-entropy alloy powder and preparation method of high-entropy alloy coating

A high-entropy alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve problems such as segregation, inability to improve forming quality, and poor surface forming quality, and achieve high hardness, process repeatability and The effect of improved operability

Active Publication Date: 2013-09-11
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document with the publication number CN102828139A discloses a high-entropy alloy powder for spraying, which uses Si and B elements added to the high-entropy alloy powder to improve its self-melting and spraying effects, but during the FeCrNiCoCu powder laser cladding experiment, Its surface forming quality is not good, and changing the laser cladding process parameters can not improve its forming quality. After a large number of laser cladding experiments, the inventor found that the main factor affecting the forming quality of FeCrNiCoCu coating is Cu element, which is prone to serious damage. Segregation

Method used

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  • Laser-cladding high-entropy alloy powder and preparation method of high-entropy alloy coating

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Embodiment 1

[0022] The powder design is carried out according to the nominal high-entropy alloy composition, regardless of the dilution of each element and the different burning loss, and the equimolar ratio of Mn, Cr, Ni, Fe, Co powder is configured. The mass percentage content of each element is as follows: 19.9% ​​Fe, 18.5% Cr, 21% Ni, 21% Co, 19.6% Mn.

[0023] According to the above formula, select pure metal element powder to configure high-entropy alloy powder. The configured powder is milled in a ball mill for 3-10 hours. The speed of the ball mill is 250-500 rpm. The ball mill tank is filled with inert gas Ar for protection. The role of ball milling is to mix the powder evenly on the one hand, and to pre-alloy the powder on the other hand. After the ball milling, the powder is preset on the 45 steel base, the preset thickness is 1.2mm, the adhesive is rosin alcohol solution, and the preset coating is dried in CO 2 The high-power laser is used for multi-pass cladding, the laser p...

Embodiment 2

[0025] Considering the dilution of each element and different burning loss situations, according to the design of a high-entropy alloy powder for laser cladding carried out in claim 1, its composition mass percentage content is: 14.2% Fe, 16.5% Cr, 24.3% Ni, 22.4% Co, 22.6% Mn.

[0026] According to the above formula, select pure metal element powder to configure high-entropy alloy powder. The configured powder is milled in a ball mill for 3-10 hours. The speed of the ball mill is 250-500 rpm. The ball mill tank is filled with inert gas Ar for protection. After the ball milling, the powder is preset on the 45 steel base, the preset thickness is 1.2mm, the adhesive is rosin alcohol solution, and the preset coating is dried in CO 2 The high-power laser is used for multi-pass cladding, the laser power used is 1.5-1.7kW, the scanning speed is 100-450mm / min, the spot diameter is 4mm, and the inert gas Ar gas is used for protection during cladding.

Embodiment 3

[0028]Considering the dilution of each element and different burning loss situations, according to the design of a high-entropy alloy powder for laser cladding carried out in claim 1, the composition mass percentage content is: 10.6% Fe, 13.4% Cr, 23.3% Ni, 23.3% Co, 23.4% Mn, 3% Si, 3% B.

[0029] According to the above formula, select pure metal element powder to configure high-entropy alloy powder. The configured powder is milled in a ball mill for 3-10 hours. The speed of the ball mill is 250-500 rpm. The ball mill tank is filled with inert gas Ar for protection. After the ball milling, the powder is preset on the 45 steel base, the preset thickness is 1.2mm, the adhesive is rosin alcohol solution, and the preset coating is dried in CO 2 The high-power laser is used for multi-pass cladding, the laser power used is 1.5-1.7kW, the scanning speed is 100-450mm / min, the spot diameter is 4mm, and the inert gas Ar gas is used for protection during cladding.

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Abstract

The invention discloses laser-cladding high-entropy alloy powder. The laser-cladding high-entropy alloy powder comprises the following elements in percentage by weight: 10%-15% of Fe, 14%-17% of Cr, 22%-25% of Ni, 22%-24% of Co, 22%-24% of Mn, 0%-4% of Si and 0%-4% of B. The invention further discloses a scheme of adding another element Al based on the gradients of the scheme, and a method for preparing a high-entropy alloy coating by using the laser-cladding high-entropy alloy powder. According to the technical scheme, after laser cladding, good coating quality is realized; a phase structure of the coating retains peculiar solid solution structure of high-entropy alloy, and the atomic percent of each main metal element in the cladding coating satisfies nominal category of the high-entropy alloy; the coating has a plurality of excellent performances of high rigidity, high temperature resistance, wear resistance, corrosion resistance and the like; the technical repeatability and operability are both greatly improved, so that the high-entropy alloy is popularized and applied in surface modification of laser materials.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a high-entropy alloy powder suitable for laser cladding surface coating technology, and a high-entropy alloy coating prepared by using the high-entropy alloy powder. Background technique [0002] Most of the traditional alloy design concepts are alloy systems based on a single principal element. It is generally believed that too many types of alloy elements will lead to the appearance of many compounds, especially brittle intermetallic compounds, which will lead to the deterioration of alloy properties and make the material lose its application value. . In 1995, Professor Ye Junwei of Tsinghua University in Taiwan and others proposed the concept of high-entropy alloys. High-entropy alloys broke the traditional alloy design concept. The alloys were prepared by 5 or more alloying elements in equimolar ratios or near equimolar ratios. Each The atomic percentage of the princ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
Inventor 姚建华翁子清董刚
Owner ZHEJIANG UNIV OF TECH
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