Nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing as well as preparation method and application thereof

A high-entropy alloy and composite powder technology, which is applied in additive processing, metal processing equipment, transportation and packaging, etc., can solve problems such as poor powder sphericity, affecting the forming performance of powder fluidity products, and uneven dispersion of nano-ceramic particles. , to achieve high sphericity, improve forming accuracy and mechanical properties, and improve powder utilization

Active Publication Date: 2020-05-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nano-ceramics reinforced high-entropy alloy spherical powders are mainly prepared by mechanical (high-energy) ball milling, but the powders prepared by this method have problems such as uneven dispersion of nano-ceramic particles on the surface of high-entropy alloys and poor powder sphericity, which directly affect the powder. Fluidity and product formability, it is difficult to meet the requirements of metal additive manufacturing process for high-performance spherical powder (such as high sphericity, narrow particle size distribution, high fluidity and bulk density, etc.)

Method used

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  • Nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing as well as preparation method and application thereof
  • Nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing as well as preparation method and application thereof
  • Nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Example 1 Preparation method of nano-TiC reinforced CoCrFeNiMn high-entropy alloy composite powder for SLM / EBM additive manufacturing

[0060] 1. Method

[0061] (1) Powder mixing: high entropy alloy powder CoCrFeNiMn (particle size 15 ~ 53μm, such as figure 1 shown) and nano-TiC particles (particle size is 20nm) are uniformly mixed by ultrasonic dispersion and mechanical stirring to obtain CoCrFeNiMn high-entropy alloy powder A with surface-adhered nano-TiC particles; wherein, the high-entropy alloy powder CoCrFeNiMn and nano-TiC particles by mass The mixing ratio is 9:1; the ultrasonic dispersion frequency is 18kHZ, the stirring rate of mechanical stirring is 60r / min, and the processing time is 120min.

[0062] (2) Powder plasma spheroidization: the CoCrFeNiMn high-entropy alloy powder A with nano-TiC particles adhered to the surface is sprayed into the plasma torch through the carrier gas (argon gas) through the powder feeder, and under the action of high-temperatur...

Embodiment 2

[0067] Example 2 Preparation method of nano-TiN reinforced WMoNbTa high-entropy alloy composite powder for LMD additive manufacturing

[0068] 1. Method

[0069] (1) Powder mixing: irregularly shaped WMoNbTa high-entropy alloy powder (particle size 45-105 μm, such as Figure 4 shown) and nano-TiN particles (particle size is 30nm) are simultaneously processed by ultrasonic dispersion and mechanical stirring to obtain WMoNbTa high-entropy alloy powder A with nano-TiN particles attached to the surface; wherein, the irregular-shaped WMoNbTa high-entropy alloy powder and nano-TiN The particles are mixed according to the mass ratio of 22:3; the ultrasonic dispersion frequency is 30kHZ, the stirring rate of mechanical stirring is 60r / min; the time is 90min;

[0070] (2) Powder plasma spheroidization: the WMoNbTa high-entropy alloy powder A with nano-TiN particles adhered to the surface is sprayed into the plasma torch through the carrier gas (argon gas) through the powder feeder, an...

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Abstract

The invention discloses nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing and a preparation method and application thereof, and belongs to the technical field of metal additive manufacturing. The preparation method of the nano ceramic reinforced high-entropy alloy composite powder for additive manufacturing comprises the following steps of powder mixing, powderplasma spheroidizing, redundant nano ceramic particle removing, powder particle size grading and mixing. According to the preparation method, high-entropy alloy serves as matrix powder, nano ceramicparticles serve as reinforcing phase particles, high-entropy alloy powder with the nano ceramic particles evenly attached to the surface is obtained in an ultrasonic dispersion and mechanical stirringmode, and then the spherical nano ceramic particle reinforced high-entropy alloy composite powder is prepared through the radio frequency plasma spheroidizing technology; and the process for preparing the nano ceramic reinforced high-entropy alloy composite powder is simple, and the prepared powder is excellent in performance and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and in particular relates to a nano-ceramic reinforced high-entropy alloy composite powder for additive manufacturing and a preparation method and application thereof. Background technique [0002] High-entropy alloys (HEAs) generally refer to a new multi-element alloy system with a simple solid solution structure composed of 4 to 13 main elements in equiatomic ratio or near equiatomic ratio. Compared with traditional alloys, high-entropy alloys have high-entropy effects, slow diffusion effects, severe lattice distortion effects and cocktail effects. The above characteristics make high-entropy alloys in hardness, compressive strength, thermal stability, corrosion resistance, magnetic properties It has excellent performance and huge potential application value in terms of energy and oxidation resistance. [0003] Additive Manufacturing (AM) technology is a technology that acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C30/00C22C32/00B33Y70/10
CPCC22C30/00C22C32/0052C22C32/0068B33Y70/00B22F1/065B22F1/14
Inventor 李小强罗浩潘存良屈盛官
Owner SOUTH CHINA UNIV OF TECH
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