Layered toughening tungsten and preparation method thereof

A toughening and layered technology, applied in the field of layered toughened tungsten and its preparation, and the first wall structure of fusion reactors, can solve the problems of tungsten irradiation embrittlement, rising tritium retention, and limited application of pure tungsten materials , to achieve the effect of increasing the expansion path

Active Publication Date: 2015-04-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing pure tungsten materials still have the following performance defects, mainly including the excessively high Ductile-Brittle Transition Temperature (DBTT), which is as high as about 400°C; the lower recrystallization temperature, Its recrystallization temperature is about 1200°C; and the self-sputtering rate increases sharply under high-energy irradiation, especially under the action of fusion high-temperature plasma irradiation, tungsten will appear irradiation embrittlement, form a nano-porous layer on the surface, and tritium retention a sharp rise in volume
The performance defects of the above pure tungsten materials seriously limit its application in nuclear fusion reactors

Method used

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  • Layered toughening tungsten and preparation method thereof
  • Layered toughening tungsten and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] This embodiment is used to prepare layered toughened tungsten, which includes alternately stacked tungsten layers and toughening layers, the thickness of the tungsten layer is about 200 μm, the thickness of the toughening layer is 30 μm, and the metal tantalum sheet is 30 μm. Specific steps are as follows:

[0025] S1: The tungsten powder is mechanically ground under the protection of Ar gas to prepare the base tungsten powder.

[0026] During ball milling, dry milling was carried out first, and the dry milling time was 8 hours, and then anhydrous ethanol was added for wet milling, and the wet milling time was 5 hours. The ball-to-material ratio of the ball mill is 10:1, and the rotational speed of the ball mill tank is 300r / min.

[0027] After ball milling, use a 400-mesh sieve to sieve to obtain matrix powder with a particle size of less than 40 μm. The use of finer particle size powder is beneficial to the sintering quality. After the tungsten powder is reduced by ...

Embodiment 2

[0033] This embodiment is used to prepare layered toughened tungsten, which includes alternately stacked tungsten layers and toughening layers, the thickness of the tungsten layer is 150 μm, and the thickness of the toughening layer is 30 μm. The toughening layer is a metal tantalum sheet of 30 μm. Specific steps are as follows:

[0034] S1: Mechanically grind tungsten powder under the protection of Ar gas to prepare tungsten powder.

[0035] During ball milling, dry milling was performed first, and the dry milling time was 10 hours, and then anhydrous ethanol was added for wet milling, and the wet milling time was 3 hours. The ball-to-material ratio of the ball mill is 15:1, and the rotational speed of the ball mill jar is 250r / min.

[0036] After ball milling, use a 400-mesh sieve to sieve to obtain tungsten powder with a particle size of less than 40 μm. The finer particle size powder is beneficial to the sintering quality. After the tungsten powder is reduced by hydroge...

Embodiment 3

[0040] This embodiment is used to prepare layered toughened tungsten, which includes alternately stacking tungsten layers and toughening layers, the thickness of the tungsten layer is 250 μm and the thickness of the toughening layer is 30 μm. The toughening layer is a metal tantalum sheet of 30 μm. Specific steps are as follows:

[0041]S1: The tungsten powder is mechanically ground by high-energy ball milling under the protection of Ar gas to prepare tungsten powder.

[0042] During ball milling, dry milling was carried out first, and the dry milling time was 5 hours, and then anhydrous ethanol was added for wet milling, and the wet milling time was 6 hours. The ball-to-material ratio of the ball mill is 8:1, and the rotational speed of the ball mill tank is 350r / min.

[0043] After ball milling, use a 400-mesh sieve to sieve to obtain tungsten powder with a particle size of less than 40 μm. The finer particle size powder is beneficial to the sintering quality. After the t...

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Abstract

The invention discloses layered toughening tungsten and a preparation method thereof and belongs to the field of structural materials. The layered toughening tungsten comprises a tungsten layer and a toughening layer which are mutually cascaded mutually; the toughening layer comprises a metal tantalum sheet. The preparation method for the layered toughening tungsten comprises the following steps of S1 mechanically grinding the tungsten powder under protection of inert gases; S2 alternately stacking the tungsten powder and the metal tantalum sheet to obtain a sintering body; S3 performing spark plasma sintering on the sintering body under the protection of the inert gases, wherein the sintering process is divided into three stages, heat preservation is performed at the first stage under the condition that the temperature is from 600 DEG C to 800 DEG C and the pressure is from 5KN to 10 KN; heat preservation is performed at the second stage under the condition that the temperature is from 1100 DEG C to 1300 DEG C and the pressure is from 12 KN to 20 KN; heat preservation is performed under the condition that the temperature is from 1600 DEG C to 1800 DEG C and the pressure is from 30 KN to 35 KN. Compared with pure tungsten, the layered tungsten prepared by the preparation method improves the toughness by 50%.

Description

technical field [0001] The invention belongs to the field of structural materials, and in particular relates to a layered toughened tungsten and a preparation method thereof, which is especially suitable for the first wall structure of a fusion reactor. Background technique [0002] Plasma Facing Materials (PFMs) is a very important material in nuclear fusion reactors. It is related to the stability of the plasma in the reactor, and it is also related to the first wall structural materials and components from plasma bombardment. The problem of damage. Its main functions include: ① Effectively prevent impurities entering the plasma; ② Effectively transfer heat radiated to the surface of the material; ③ Prevent other components from being damaged by plasma bombardment during abnormal shutdown. Therefore, the general requirements for plasma-facing materials are high temperature resistance, low sputtering, low tritium retention, and compatibility with structural materials. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B32B15/01
Inventor 索进平张颖刘大为周同王艳
Owner HUAZHONG UNIV OF SCI & TECH
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