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Double-nanostructure tungsten alloy with good high-temperature stability and preparation method and application thereof

A nanostructure, tungsten alloy technology, applied in the field of material science, to achieve the effect of simple preparation method, excellent strength and high temperature stability, and improve the strength of the alloy

Active Publication Date: 2021-01-15
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the ODS-W alloy prepared by conventional methods, the tungsten grain size is still on the order of micron or submicron

Method used

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  • Double-nanostructure tungsten alloy with good high-temperature stability and preparation method and application thereof
  • Double-nanostructure tungsten alloy with good high-temperature stability and preparation method and application thereof
  • Double-nanostructure tungsten alloy with good high-temperature stability and preparation method and application thereof

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Effect test

Embodiment 1

[0047] This embodiment provides a kind of double nanostructure tungsten alloy, and its preparation method comprises the following steps:

[0048] (1) Weigh and mix tungsten powder, titanium powder and zirconium carbide powder according to the mass percentage of 98.5%, 1.0% and 0.5% respectively, and place them in an argon atmosphere for ball milling to achieve alloying and nanocrystallization , the rotating speed of ball milling is 600r / min, and the time of ball milling is 48h, obtains nanocrystalline alloy powder; The transmission electron microscope (TEM) figure of this nanocrystalline alloy powder is as follows figure 1 shown;

[0049] (2) Place the nanocrystalline alloy powder obtained in step (1) in a die set (mold), and then place it together with the die set (mold) in a dry and flowing argon atmosphere, and then place it in a spark plasma sintering process. Sinter in a furnace at a temperature of 1400°C and a pressure of 50 MPa for 40 minutes to obtain a dense alloy bl...

Embodiment 2

[0053] This embodiment provides a kind of double nanostructure tungsten alloy, and its preparation method comprises the following steps:

[0054] (1) Weigh and mix tungsten powder, titanium powder and zirconium carbide powder according to the proportions of 97%, 2.0% and 1.0% by mass respectively, and place them in a vacuum environment <10Pa for ball milling to achieve alloying and nano Crystallization, the speed of ball milling is 450r / min, and the time of ball milling is 60h to obtain nanocrystalline alloy powder;

[0055] (2) Place the nanocrystalline alloy powder obtained in step (1) in a die set (mold), and then place it together with the die set (mold) in a dry and flowing argon atmosphere, and then place it in a spark plasma sintering process. Sinter in a furnace at a temperature of 1600°C and a pressure of 60 MPa for 30 minutes to obtain a dense alloy block (the density of the alloy block is higher than 96%, and the block has no cracks), which is a double nanostructure...

Embodiment 3

[0058] This embodiment provides a kind of double nanostructure tungsten alloy, and its preparation method comprises the following steps:

[0059] (1) Weigh and mix tungsten powder, titanium powder and zirconium carbide powder according to the mass percentage of 98.5%, 1.0% and 0.5% respectively, and place them in an argon atmosphere for ball milling to achieve alloying and nanocrystallization , the rotating speed of ball milling is 300r / min, the time of ball milling is 72h, and nanocrystalline alloy powder is obtained;

[0060] (2) Place the nanocrystalline alloy powder obtained in step (1) in a mold cover (mould), and then place it together with the mold cover (mould) in a dry and flowing argon atmosphere. Sintering at a temperature of 1400°C and a pressure of 50 MPa for 40 minutes to obtain a dense alloy block (the density of the alloy block is higher than 96%, and the block has no cracks), which is a double nanostructure tungsten alloy.

[0061] The double nanostructure tu...

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Abstract

The invention belongs to the technical field of material science, and discloses a double-nanostructure tungsten alloy with good high-temperature stability and a preparation method and application thereof. The double-nanostructure tungsten alloy comprises the following raw material components: tungsten, titanium and zirconium carbide. The preparation method of the double-nanostructure tungsten alloy comprises the following steps of: (1) raw material mixing: weighing the components according to the formula ratio, and performing ball milling in a protective atmosphere to realize alloying and nanocrystallization to obtain nanocrystalline alloy powder; and (2) sintering and forming: putting the nanocrystalline alloy powder obtained in the step (1) into a mold, and performing pressure sinteringto prepare the double-nanostructure tungsten alloy. The sizes of tungsten crystal grains and second phase dispersed particles in the double-nanostructure tungsten alloy are both nanoscale, and the double-nanostructure tungsten alloy has good hardness and high-temperature stability.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a double nanostructure tungsten alloy with good high temperature stability, a preparation method and application thereof. Background technique [0002] Since the plasma-facing wall materials in nuclear fusion reactors need to serve under extremely harsh conditions such as high temperature, high thermal load shock, and high-energy particle bombardment, the development of better-performing plasma-facing wall materials has become the key to the development of nuclear fusion energy. [0003] Due to its high melting point, high strength, low thermal expansion coefficient, high thermal conductivity, anti-sputtering, and low deuterium-tritium retention, metal tungsten is considered to be one of the most promising candidate wall materials for fusion reactors facing the plasma wall. However, tungsten has room temperature brittleness (the ductile-brittle transition tem...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/10C22C1/05
CPCC22C1/045C22C1/05C22C27/04
Inventor 张涛
Owner GUANGZHOU UNIVERSITY
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