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Refractory high-entropy alloy powder material, preparation method and application of refractory high-entropy alloy powder material in additive manufacturing

A technology of powder materials and high-entropy alloys, applied in the application of additive manufacturing, preparation, and the field of refractory high-entropy alloy powder materials, can solve the problems of room temperature brittleness, crack formation quality, and poor machinability of refractory high-entropy alloys and other problems, to achieve the effect of improving crack resistance, improving material utilization, and low cost

Pending Publication Date: 2022-08-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above defects in the prior art, the technical problem to be solved by the present invention is that the room temperature brittleness of refractory high-entropy alloys leads to poor machinability, and it is easy to produce defects such as cracks and bottlenecks such as poor forming quality in additive manufacturing. Commonly used arc melting, powder metallurgy and other preparation methods for high-entropy alloys have shortcomings such as insufficient size and simple shape.

Method used

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  • Refractory high-entropy alloy powder material, preparation method and application of refractory high-entropy alloy powder material in additive manufacturing
  • Refractory high-entropy alloy powder material, preparation method and application of refractory high-entropy alloy powder material in additive manufacturing
  • Refractory high-entropy alloy powder material, preparation method and application of refractory high-entropy alloy powder material in additive manufacturing

Examples

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Effect test

Embodiment 1

[0037] Use Nb, Mo, Ta, W powder materials with particle size of 50-150μm, atomic percentage of 25%, 24.5%, 25%, 25%, respectively, add ZrC powder with particle size of 50nm-200nm, atomic percentage of 0.5% , the purity of the powder material used is ≥99.9%, and the additive manufacturing is carried out after uniform mixing by ball milling and vacuum drying. The steps are as follows:

[0038] Step 1) Select a tungsten substrate of 100mm×100mm×20mm, and clean it until it is clean, free of oil, dust, rust, etc.;

[0039] Step 2) use an industrial robot to carry a laser, connect a powder-feeding laser additive manufacturing system in parallel, and sieve the powder and fill it into the powder-feeding system;

[0040] Step 3) establish in the software the 3D model of the cube array with a side length of 20mm to be printed, convert it into a robot scanning path file, and input it into the robot control computer;

[0041] Step 4) Scan with a given path at a scanning speed of 8mm / s, a...

Embodiment 2

[0045] Using Nb, Mo, Ta, W powder materials with particle size of 15-60μm, atomic percentage of 24%, 24%, 24%, 24%, respectively, adding TiC powder with particle size of 10nm-100nm, atomic percentage of 4% , the purity of the powder material used is ≥99.95%, and the additive manufacturing is carried out after uniform mixing by ball milling and vacuum drying. The steps are as follows:

[0046] Step 1) Select a 100mm×100mm×10mm Nb substrate, and clean it until it is clean, free of oil, dust, rust, etc.;

[0047] Step 2) adopting a powder bed spreading powder additive manufacturing system, sieving the powder and filling it into the powder spreading system, and at the same time, the scraper in the powder spreading system spreads the first layer of powder on the substrate;

[0048] Step 3) Create a 3D model of a cylindrical array with a radius of 5mm and a height of 10mm to be printed in the software, convert it into a robot scanning path file, and input it into the robot control c...

Embodiment 3

[0053] Use Nb, Mo, Ta, W powder materials with particle size of 5-80μm, atomic percentage of 20%, 20%, 30%, 28%, respectively, add WC powder with particle size of 100nm-50μm, atomic percentage of 2% , the purity of the powder material used is ≥99.9%, and the additive manufacturing is carried out after uniform mixing by ball milling and vacuum drying. The steps are as follows:

[0054] Step 1) Select a Mo substrate of 200mm×200mm×10mm, and clean it until it is clean, free of oil, dust, rust, etc.;

[0055] Step 2) adopting a powder bed spreading powder additive manufacturing system, sieving the powder and filling it into the powder spreading system, and at the same time, the scraper in the powder spreading system spreads the first layer of powder on the substrate;

[0056] Step 3) establish in the software the 3D model of the cube array with a side length of 20mm to be printed, convert it into a robot scanning path file, and input it into the robot control computer;

[0057] S...

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Abstract

The invention discloses a refractory high-entropy alloy powder material, and relates to the field of additive manufacturing and high-entropy alloys, the refractory high-entropy alloy powder material is characterized in that the material main body component comprises powder materials of Nb, Mo, Ta and W, the atomic percent of each metal is 10%-40%, the added powder comprises one or two of NbC, MoC, TaC, WC, ZrC, TiC and C, and the atomic percent content is 0 lt; x is less than or equal to 5%, and the total atomic percent is 100%. The preparation method comprises the following steps: removing an oxide layer and impurities of the powder material, then weighing and proportioning, carrying out ball milling and uniform powder mixing treatment, and finally drying the composite powder material by adopting vacuum heating equipment for later use. The invention further discloses an application method of the refractory high-entropy alloy powder material in additive manufacturing. According to the refractory high-entropy alloy powder material, the problems of easy cracking and defects in additive manufacturing are solved, and the refractory high-entropy alloy powder material has wide application prospects in the high-temperature and ultra-high-temperature fields.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing and high-entropy alloys, in particular to a refractory high-entropy alloy powder material, a preparation method and its application in additive manufacturing. Background technique [0002] Refractory high-entropy alloys have attracted widespread attention from all over the world due to their excellent high-temperature resistance, and are considered to trigger a revolutionary change in the field of superalloys. The NbMoTaW-based refractory high-entropy alloy was first publicly reported by the Senkov team of the US Air Force Laboratory in 2010. It can not only keep the phase structure and structure stable at 1400 °C, but also has outstanding comprehensive mechanical properties at 1600 °C. Above ℃, its high-temperature mechanical properties such as yield strength and specific yield strength far exceed those of nickel-based superalloys. [0003] However, most refractory high-entropy al...

Claims

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Application Information

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IPC IPC(8): B22F1/12B22F1/142B22F9/04B22F10/25B22F10/28B33Y10/00B33Y70/10C22C30/00C22C1/04
CPCB22F9/04B22F10/25B22F10/28B33Y10/00B33Y70/10C22C30/00C22C27/04C22C1/045C22C27/02B22F2009/043Y02P10/25
Inventor 冯凯徐金涛李铸国段然张显程
Owner SHANGHAI JIAO TONG UNIV