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High-entropy alloy powder used for spraying

A high-entropy alloy and powder technology, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problems that the coating forming quality and surface continuity cannot meet the production and use requirements, so as to improve the spraying effect, Effect of improving self-fluxing property

Inactive Publication Date: 2012-12-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large differences in thermal physical properties such as density, melting point, specific heat and expansion coefficient between different types of metal elements in high-entropy alloy powders and between them and the base material, it is directly used for laser cladding, thermal spraying and other surfaces. Technology is difficult to obtain a coating with uniform composition, and the forming quality and surface continuity of the coating cannot meet the requirements of production and use

Method used

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  • High-entropy alloy powder used for spraying
  • High-entropy alloy powder used for spraying
  • High-entropy alloy powder used for spraying

Examples

Experimental program
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Effect test

Embodiment 1

[0016] CuCoNiCrFe high entropy alloy coating preparation:

[0017] The high-entropy alloy powder of CuCoNiCrFe was prepared according to the molar percentage, and the powder configuration of pure metal elements was used. The addition content of the five main elements was 19.6%, and B: 1%, Si: 1%. The configured elements are uniformly mixed in CO 2 Under the irradiation of high-power laser, the surface of Q235 substrate material was clad in a single pass by synchronous powder feeding method. The laser power used was 2.0 kW, the scanning speed was 100 mm / min, and an inert gas was used to protect it during cladding.

Embodiment 2

[0019] NiCoFeCrAl 2 High entropy alloy coating preparation:

[0020] Preparation of NiCoFeCrAl by mole percentage 2 The high-entropy alloy powder is made of pure metal element powder, in which Ni, Co, Fe, and Cr are all added at 16%, Al at 32%, and B and Si at 2%. The configured elements are uniformly mixed in CO 2 Under the irradiation of high-power laser, the surface of Q235 substrate material was clad on the surface of Q235 base material by synchronous powder feeding method. The laser power used was 3.5 kW, the scanning speed was 500 mm / min, and the cladding was protected by inert gas.

Embodiment 3

[0022] NiCoFeCrSiAlCu 0.5 High entropy alloy coating preparation:

[0023] Preparation of NiCoFeCrSiAlCu by Mole Percentage 0.5 High-entropy alloy powder, in which Ni, Co, Fe, Cr, Si, and Al are all added at 15%, Cu is 7.5%, and B: 2.5% is added. After being smelted into a bulk alloy in a vacuum electric arc furnace, the mechanical Grinding method to prepare the desired powder. in CO 2 Under high-power laser irradiation, multi-pass cladding on the surface of the Q235 base material was carried out by synchronous powder feeding. Inert gas protection.

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Abstract

The invention discloses high-entropy alloy powder used for spraying, belonging to the technical field of alloy materials. The high-entropy alloy powder comprises five or more than five metal elements and non-metal elements Si and B, wherein addition amount of each metal element accounts for 5-35mol% of the total mole number of the high-entropy alloy powder, content of the added non-metal element Si accounts for 1-20mol% of the total mole number of the high-entropy alloy powder, and the content of the added non-metal element B accounts for 1-10mol% of the total mole number of the high-entropy alloy powder. The high-entropy alloy powder disclosed by the invention and a coating prepared by the high-entropy alloy powder after solidification can avoid precipitation of massive brittle phases after the traditional multi-element alloy is solidified, the coating has a simple fcc or bcc solid solution phase structure, brittleness of the multi-element alloy can be greatly reduced, the coating has multiple excellent performances such as high hardness, thermostability, wear resistance and corrosion resistance, and the high-entropy alloy powder can be applied to multiple surface coating technologies such as thermal spraying and laser cladding and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a high-entropy alloy powder for spraying suitable for surface coating technologies such as thermal spraying and laser cladding. Background technique [0002] Most of the traditional alloy design concepts are alloy systems with a single principal element as the matrix. When the types and contents of other components are added too much, it will lead to the formation of various brittle intermetallic compounds, reduce the toughness of the material, and make the material lose its application value. In 2004, China Taiwan Invention Patent No. 193729 disclosed a new type of high-entropy alloy bulk material. The total molar ratio is between 5% and 35%. Multi-principal high-entropy alloys can effectively avoid the precipitation of brittle phases in traditional multi-element alloys and form simple FCC and BCC solid solution phases by virtue of their unique high-entropy effect, slow...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C24/10C23C30/00
Inventor 张晖何宜柱
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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