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High-entropy alloy spherical powder for molten additive manufacturing of powder bed and preparing method and application thereof

A high-entropy alloy and additive manufacturing technology, applied in the field of additive manufacturing, can solve problems such as the inability to meet the fine-grained requirements, reduce the mechanical properties of the product, and poor powder sphericity, and achieve the suppression of the formation of satellite balls and hollow powder, easy Obtain the effect of high sphericity

Active Publication Date: 2020-06-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-entropy alloy powders for additive manufacturing are mainly prepared by gas atomization (including vacuum atomization VIGA and induction melting atomization EIGA) and rotating electrode atomization (PREP), but the powder sphericity prepared by gas atomization Poor, accompanied by a large number of satellite balls and hollow powder, will cause poor powder fluidity, printing defects and reduce the mechanical properties of the product; while the particle size of the powder prepared by the rotating electrode atomization method is generally concentrated in 106-248 μm, which cannot meet the requirements of selective laser melting and Fine particle size requirements of metal powders for powder bed fusion additive manufacturing processes such as electron beam selective melting (<53 μm)

Method used

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  • High-entropy alloy spherical powder for molten additive manufacturing of powder bed and preparing method and application thereof
  • High-entropy alloy spherical powder for molten additive manufacturing of powder bed and preparing method and application thereof
  • High-entropy alloy spherical powder for molten additive manufacturing of powder bed and preparing method and application thereof

Examples

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Embodiment 1

[0051] Embodiment 1: the preparation method of AlFeNiCuTiV high-entropy alloy powder for powder bed fusion additive manufacturing

[0052] (1) Prepare high-entropy alloy wires: Al, Fe, Ni, Ti, V single metal wires are wound and twisted, and the pure Cu tube is used to wrap the wound metal wires tightly, and then drawn to make AlFeNiCuTiV high-entropy alloy wires material; the surface of the high-entropy alloy wire is cleaned to remove oil and scale; the diameters of Al, Fe, Ni, Ti, and V metal wires are: 3mm, 2.5mm, 2.5mm, 3.25mm, and 2.75mm; The outer diameter of the Cu tube is 8.25mm, and the inner diameter is 6.25mm; the purity of Al, Fe, Ni, Ti, V elemental metals and pure Cu tube is 99.9%, and the diameter of the produced high-entropy alloy wire is 3mm.

[0053] (2) Preparation before atomization: Vacuumize the atomization tank first, turn off the vacuum pump after the vacuum degree is less than 10Pa, and then pass in inert gas to atmospheric pressure; send the high-entro...

Embodiment 2

[0057] Example 2: AlFeNiCuTiV for powder bed fusion additive manufacturing 0.5 Preparation method of high entropy alloy powder

[0058] (1) Prepare high-entropy alloy wires: Al, Fe, Ni, Ti, V single metal wires are wound and stranded, covered with pure Cu tubes to wrap them tightly, and then drawn to make AlFeNiCuTiV 0.5 High-entropy alloy wire; the surface of the high-entropy alloy wire is cleaned to remove oil stains and scales; the diameters of Al, Fe, Ni, Ti, V elemental metal wires are: 2.4mm, 2mm, 2mm, 2.6mm, 1.8mm; the outer diameter of the Cu tube is 6.4mm, the inner diameter is 4.8mm; the purity of Al, Fe, Ni, Ti, V elemental metals and pure Cu tubes are all 99.9%, and the diameter of the produced high-entropy alloy wire is 2mm.

[0059] (2) Preparation before atomization: Vacuumize the atomization tank first, turn off the vacuum pump after the vacuum degree is less than 10Pa, and then pass in inert gas to atmospheric pressure; send the high-entropy alloy wire into t...

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Abstract

The invention discloses a high-entropy alloy spherical powder for molten additive manufacturing of a powder bed and a preparing method and application thereof, and belongs to the technical field of additive manufacturing. The preparing method of the high-entropy alloy spherical powder for molten additive manufacturing of the powder bed comprises the following steps of high-entropy alloy wire preparing, preparing before atomizing, plasma atomizing, powder granularity grading and mixing. A plasma atomizing method is adopted, a plasma jet flow is used for melting a high-entropy alloy wire, impurity introducing caused by manners of crucible smelting and the like can be avoided, purity of a high-entropy alloy melt can be ensured, the plasma jet flow serves as atomizing media, the spheroidizingtime of broken liquid drops can be greatly prolonged, the metal liquid drops can be promoted to be solidified to form spherical powder particles, the prepared high-entropy alloy powder is high in sphericity degree, smooth and compact in surface, free of satellite balls and hollow powder, good in powder fluidity, low in oxygen content and few in impurity, and the property requirement of molten additive manufacturing of the powder bed for the high-property metal powder can be met.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a high-entropy alloy spherical powder for powder bed fusion additive manufacturing and its preparation method and application. 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 accumulates and super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B22F1/00B33Y70/00
CPCB22F9/14B33Y70/00B22F1/14Y02P10/25
Inventor 罗浩李小强潘存良屈盛官
Owner SOUTH CHINA UNIV OF TECH
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