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High-heat load impact resistant high-toughness fine-grain W-based composite material and preparation method thereof

A load shock and composite material technology, applied in the field of ionic materials, can solve the problems that affect the safe and stable operation of fusion reactors, reduce the strength and toughness of W materials, and have large differences in bond structures, and achieve excellent resistance to high thermal load shock performance, improve performance, Improved effect of high thermal load shock resistance

Active Publication Date: 2022-05-27
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the great difference in the bond structure between carbide and refractory metal W, the compatibility is poor, the second phase of added nano carbide is easy to segregate, and it is easy to form a crack source under the action of external load, thereby reducing the strength of W material. toughness
More importantly, as a fusion reactor facing the plasma material PFMs, it will face an extremely harsh thermal service environment, including high temperature (1300K), high energy density (20MW / m 2 ) steady-state heat load and up to ~GW / m 2 The transient high thermal load shocks of edge localized modes (ELMs) and vertical displacement events (VDEs) at the level will seriously affect the safe and stable operation of the fusion reactor
At the same time, in the future, the PFM of China Fusion Engineering Test Reactor (CFETR) will face a higher thermal load shock to the service environment. Therefore, the existing W materials cannot meet the above stringent requirements and become a prominent bottleneck restricting the development of nuclear fusion.

Method used

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  • High-heat load impact resistant high-toughness fine-grain W-based composite material and preparation method thereof
  • High-heat load impact resistant high-toughness fine-grain W-based composite material and preparation method thereof
  • High-heat load impact resistant high-toughness fine-grain W-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the ultrafine-grained W-0.1%TiC-0.1%Ti composite material as an example, the composition of each element by mass percentage is as follows: TiC is 0.1%, Ti is 0.1%, and the rest is refractory metal W.

[0032] S1: According to the above ratio, put the nano-carbide and tungstate into 15000g deionized water, mix them thoroughly by magnetic stirring, add PEG400 and diphenyl ether, and adjust the pH to induce the nano-carbide and tungsten salt to form a coated core-shell structure sol The core-shell precursor was prepared by rapid spray drying;

[0033] S2: the above-mentioned coating structure precursor is calcined in an air atmosphere, and hydrogen-thermally reduced to obtain a core-shell structure composite powder coated with nano-carbides;

[0034] S3: The core-shell structure composite powder of the above nano-carbide-coated W and nano-TiH 2 The powder was activated by high energy in a stainless steel tank according to the proportion, the time was 5h, the rotati...

Embodiment 2

[0037] Taking the ultrafine-grained W-0.5%TiC-0.5%Ti composite material as an example, the composition of each element is as follows in terms of mass percentage: TiC is 0.5%, Ti is 0.5%, and the rest is refractory metal W.

[0038]S1: According to the above ratio, put the nano-carbide and tungstate into 15000g deionized water, fully mix by magnetic stirring, add PEG400 and sodium dodecyl benzene sulfonate, and adjust the pH to induce nano-carbide and tungsten salt to form a package The core-shell structure sol is prepared by rapid spray drying to prepare the core-shell precursor;

[0039] S2: the above-mentioned coating structure precursor is calcined in an air atmosphere, and hydrogen-thermally reduced to obtain a core-shell structure composite powder coated with nano-carbides;

[0040] S3: The above-mentioned nano-carbide-coated W core-shell structure composite powder and nano-Ti powder are subjected to high-energy activation treatment in a stainless steel tank in proportion...

Embodiment 3

[0043] Taking the ultra-fine-grained W-1%TiC-1%Ti composite material as an example, the composition of each element in terms of mass percentage is as follows: TiC is 1%, Ti is 1%, and the rest is refractory metal W.

[0044] S1: According to the above ratio, put the nano-carbide and tungstate into 15000g deionized water, fully mix by magnetic stirring, add stearic acid and sodium dodecyl benzene sulfonate, and adjust the pH to induce nano-carbide and tungsten salt forming a sol with a coated core-shell structure, and preparing a core-shell precursor through rapid spray drying;

[0045] S2: the above-mentioned coating structure precursor is calcined in an air atmosphere, and hydrogen-thermally reduced to obtain a core-shell structure composite powder coated with nano-carbides;

[0046] S3: The core-shell structure composite powder of the above nano-carbide-coated W and nano-Ti and TiH 2 The powder was subjected to high-energy activation treatment in a stainless steel tank acco...

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Abstract

The invention provides a fine grain W-based composite material with high thermal load impact resistance and high toughness and a preparation method thereof. The composite material is composed of a composite reinforcement phase, wherein the composite reinforcement phase is composed of nanoscale ultra-high-temperature ceramic carbide (TiC or ZrC), Ti and Zr alloying elements and a refractory metal W matrix; alloying elements are distributed on the surface of a W matrix, and an enrichment area is formed at nano ultra-high-temperature carbide particles, so that an interface structure of an ultra-high-temperature carbide ceramic phase and a W matrix phase is effectively improved, W grain boundary migration and partial formation of semi-coherence are hindered, and fine grains and interface strengthening and toughening are realized; the preparation method comprises the following steps: sol spray drying, reduction, high-energy activation treatment and low-temperature reinforced sintering. The grain size of the composite material is 1-2 [mu] m, the tensile strength at room temperature reaches 450-600 MPa, the ductility is 5%-8%, no crack damage is formed on the surface under the impact of a transient electron beam high heat load of 700 MW / m < 2 >, and the high heat load impact resistance of the W composite material is remarkably improved.

Description

technical field [0001] The invention relates to the field of nuclear fusion facing plasma materials, in particular to a high-strength, toughness, fine-grained W-based composite material resistant to high thermal load impact and a preparation method thereof. Background technique [0002] Refractory metal W and its alloy materials have a series of outstanding performance advantages such as high melting point, high thermal conductivity, high temperature and high strength, and are widely used in cutting-edge technical fields such as aviation, aerospace, national defense and military industries. At the same time, due to its low emissivity and no reaction with H isotopes, it has become the most ideal plasma facing material (PFMs) for thermonuclear fusion reactors. However, existing tungsten materials still have some deficiencies, such as: low temperature embrittlement, high ductile-brittle transition temperature (DBTT), and low recrystallization temperature (RCT), which greatly li...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C32/00C22C1/05
CPCC22C27/04C22C32/0052C22C1/05Y02E30/10
Inventor 吕永齐赵斯琪范景莲张紫薇韩勇刘涛田家敏
Owner CENT SOUTH UNIV
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