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Tungsten-based columnar crystal high-entropy alloy plasma facing material and preparation method thereof

A high-entropy alloy and plasma technology, which is applied in metal material coating process, greenhouse gas reduction, gaseous chemical plating, etc., can solve the problems of columnar crystal high-entropy alloys that have not been reported, and achieve improved resistance to neutron irradiation. capacity, reduced fuel retention, high recombination rate

Pending Publication Date: 2022-03-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, thin-film materials are mostly studied in the tungsten-based high-entropy alloy system, and columnar high-entropy alloys have not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using the chemical vapor deposition method, the implementation steps are:

[0021] The required fluorinated gas by atomic percentage WF 6 35%, TaF 5 20%, CrF 3 15%, VF 4 10%, TiF 3 10%, YF 3 10% is fully mixed and passed into the introduction device, and a rolled tungsten plate is placed in the reaction chamber as a deposition substrate. After the substrate is heated to 600°C by electricity, the mixed gas and hydrogen are passed into the reaction chamber at a ratio of 1:2.28. After the chemical reaction, the deposited layer is obtained on the substrate, deposited to the required thickness and then cooled and taken out. The atomic percentages of the obtained tungsten-based columnar high-entropy alloy are: W35%, Ta 20%, Cr 15%, V 10%, Ti 10%, Y 10%, and the columnar crystal size is 50 μm. After irradiation with deuterium plasma, the retention rate was measured by thermal desorption spectroscopy to be 3×10 -6 .

Embodiment 2

[0023] Using the chemical vapor deposition method, the implementation steps are:

[0024] The required fluorinated gas by atomic percentage WF 6 30%, TaF 5 25%, CrF 3 25%, VF 4 10%, TiF 3 5%, YF 3 5% is fully mixed and passed into the introduction device, and the rolled tungsten plate is placed in the reaction chamber as a deposition substrate. Heat the substrate to 800°C with electricity, and pass the mixed gas and hydrogen into the reaction chamber at a volume ratio of 1:2.25. After the chemical reaction, the deposited layer can be obtained on the substrate, deposited to the required thickness and then cooled and taken out. The atomic percentages of the obtained tungsten-based columnar high-entropy alloy are: W 30%, Ta 25%, Cr 25%, V 10%, Ti 5%, Y 5%, and the columnar crystal size is 30 μm. After irradiation with deuterium plasma, the retention rate was measured by thermal desorption spectroscopy as 1×10 -6 .

Embodiment 3

[0026] Using the chemical vapor deposition method, the implementation steps are:

[0027] The above-mentioned fluorinated gases are expressed in atomic percent WF 6 20%, TaF 5 10%, CrF 3 10%, VF 4 20%, TiF 3 20%, YF 3 20% is fully mixed and passed into the introduction device, and the rolled tungsten plate deposition substrate is put into the reaction chamber. After heating the substrate with electricity to 1000°C, the mixed gas and hydrogen gas are passed into the reaction chamber at a volume ratio of 1:2.0. After the chemical reaction, the deposited layer is obtained on the substrate, deposited to the required thickness and then cooled and taken out. The atomic percentages of the obtained tungsten-based columnar high-entropy alloy are: W20%, Ta 10%, Cr 20%, V 20%, Ti 20%, Y 20%, and the columnar crystal size is 10 μm. After being irradiated by deuterium plasma, the retention rate measured by thermal desorption spectroscopy was 5×10 -7 .

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Abstract

The invention discloses a tungsten-based columnar crystal high-entropy alloy plasma facing material and a preparation method thereof, and belongs to the field of nuclear fusion energy application. The tungsten-based columnar crystal high-entropy alloy is provided with columnar crystal grains with (001) orientation, and the grain size ranges from 10 micrometers to 70 micrometers. The high-entropy alloy comprises, by atomic percent, 20%-35% of W, 10%-25% of Ta, 10%-25% of Cr, 10%-20% of V, 5%-20% of Ti and 5%-20% of Y. The density of the tungsten-based columnar crystal high-entropy alloy can reach 99% or above, the purity of the tungsten-based columnar crystal high-entropy alloy exceeds 99.9%, the size of the columnar crystal can be controlled to be 10-70 microns, and fuel retention in a material after irradiation can be remarkably reduced. According to the tungsten-based columnar crystal high-entropy alloy, due to the high-entropy effect, the migration energy of interstitials and vacancies in the irradiated material is closer, so that the recombination rate of the interstitials and the vacancies is higher, and the neutron irradiation resistance of the material can be remarkably improved.

Description

technical field [0001] The invention belongs to the application field of nuclear fusion energy, and specifically relates to a design for plasma materials, that is, a tungsten-based columnar crystal high-entropy alloy. The invention is suitable for high-beam plasma and high-flux fusion neutron irradiation environments , used as a plasma-facing material in a nuclear fusion device. Background technique [0002] Efficient and clean energy has gradually become the ultimate trend of future energy development. Nuclear fusion energy is expected to become the ultimate energy source in the future society because of its abundant reserves, non-radioactivity compared with fission, clean and efficient. Nuclear fusion refers to the process in which two or more light atomic nuclei, such as deuterium and tritium, fuse to form a heavier atomic nucleus and release a large amount of energy. However, due to technical limitations, controllable nuclear fusion has not been realized. Among them, ...

Claims

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Application Information

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IPC IPC(8): C22C30/00C23C16/08C22C1/02G21B1/11
CPCC22C30/00C23C16/08C22C1/02G21B1/11Y02E30/10
Inventor 袁悦孙钰涵王诗维程龙吕广宏
Owner BEIHANG UNIV
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