Wear-resistant and oxidation-resistant high-entropy alloy coating and preparation method thereof

A technology of alloy coating and high-entropy oxidation, which is applied in the coating process and coating of metal materials, can solve the problems that the wear resistance cannot meet the requirements of working conditions, the high-temperature strength of high-entropy alloys is low, and the physical properties are quite different. , to achieve the effect of improving high temperature oxidation resistance, high hardness, and improving crack growth resistance

Active Publication Date: 2021-01-15
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-entropy alloy is a multi-principal alloy, which is an alloy formed by four or more equal or approximately equal amounts of metals. Because of its special alloy composition, its high-temperature performance is far superior to that of traditional alloys, but due to its The high alloy content leads to high preparation costs and it is difficult to apply in large areas. The application of coating preparation can greatly save its cost
However, the face-centered cubic high-entropy alloy mainly composed of FeCoCrNi has low high-temperature strength, and its wear resistance often cannot meet the requirements of working conditions. It is necessary to introduce strengthening phases to improve its wear resistance.
By adding hard ceramic powder particles (such as WC, Al 2 o 3 、Si 3 N 4 ) is added to the high-entropy alloy coating as a strengthening phase to improve the high-temperature wear resistance of the coating is a common method, but due to the large difference in physical properties between ceramic powder and metal materials, the interface is likely to become the source of crack initiation , causing the coating to crack and fail

Method used

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  • Wear-resistant and oxidation-resistant high-entropy alloy coating and preparation method thereof
  • Wear-resistant and oxidation-resistant high-entropy alloy coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] 13% Fe powder, 17% Co powder, 23% Cr powder, 18% Ni powder, 14% Nb powder, 4% FeSi75-A powder (containing Si 74-80%), 10% FeCr55C10 powder (containing Cr 60-65%, containing C10%, Fe balance) and 1% CeO 2 Put the powder into a ball mill with a size of 75 μm, a ball-to-material ratio of 5:1, and a rotation speed of 80 r / min, and mix uniformly for 10 hours. Mix the mixed powder with shellac alcohol solution to make a paste, and apply it on the surface of H13 steel. Using a multi-mode fiber laser, the beam diameter is 3mm, the laser power is 1200W, the scanning speed is 400mm / min, and the overlap rate 40%, cladding is carried out, and the hardness of the obtained coating is about 890HV. The coating was oxidized in air at 700°C for 100 hours, and the weight gain was only 0.07%.

Embodiment 2

[0034] The high-entropy alloy powder was prepared by atomization forming method, and the chemical quality of the coating composition was 17% Fe, 18% Co, 30% Cr, 17% Ni, 14% Nb, 3% Si and 1% c. Then add 1% CeO to the high entropy alloy powder 2 Put the powder into a double-motion powder mixer at a speed of 30r / min, and mix evenly for 20 hours. Put the mixed powder into the powder feeding gas, the powder feeding gas is N 2 , using a multi-mode fiber laser, the powder feeding rate is 10g / min, the beam diameter is 3mm, the laser power is 2000W, the scanning speed is 300mm / min, the overlap rate is 40%, and the coating hardness is 920HV. about. The coating at 700°C N 2 , CO 2 with H 2 Oxidation in the mixed gas of O for 100 hours, the weight gain is only 0.09%.

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Abstract

The invention provides a wear-resistant and oxidation-resistant high-entropy alloy coating and a preparation method thereof. The alloy coating comprises, by mass, 15-21% of Fe, 15-21% of Co, 26-35% ofCr, 15-21% of Ni, 11-18% of Nb, 1-6% of Si, 0.1-1.2% of C, and 1-2% of CeO2. The coating is prepared by adopting a preset powder method and a coaxial powder feeding method. The preset powder method comprises the steps of weighing Co, Cr, Fe, FeNb, FeSi powders, FeCrC powders and CeO2 powders according to target coating components; uniformly mixing and drying at 80-150 DEG C for 1-4 hours; uniformly pre-spreading dried mixed powders on the surface of a substrate, wherein the thickness is 0.6-1.3 mm; and then laser cladding the powders on the surface of the substrate to form the wear-resistantand oxidation-resistant high-entropy alloy coating. The coaxial powder feeding method comprises the steps of firstly preparing alloy powders by adopting a smelting gas atomization method according tothe content of Co, Cr, Fe, Nb, Si and C in the coating; uniformly mixing the alloy powders with the CeO2 powders, and drying at 80-150 DEG C for 1-4 hours; putting the dried powders into a powder feeding cylinder; feeding the powders by adopting nitrogen protection; and laser cladding the powders on the surface of the substrate to form the wear-resistant and oxidation-resistant high-entropy alloycoating.

Description

technical field [0001] The invention belongs to the field of coating preparation, and relates to a wear-resistant and anti-oxidation high-entropy alloy coating and a preparation method thereof, which are suitable for material surface protection and component repair. Background technique [0002] In the aviation industry, energy power industry, and metallurgical processes, more and more parts fail due to high-temperature environments (such as high-temperature wear, high-temperature oxidation, etc.), and materials with beneficial high-temperature properties can effectively improve the service life of these parts. Coating a layer of high temperature resistant coating on the surface of the material is an important means to improve the performance of parts. It can not only meet the high-temperature performance requirements of parts in industrial production, but also reduce the cost of industrial production and repair costs. [0003] High-entropy alloy is a multi-principal alloy,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
CPCC23C24/103C22C30/00
Inventor 连勇张津马旻昱
Owner UNIV OF SCI & TECH BEIJING
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