High-toughness Nb doped W/TiC composite material and preparation method thereof

A composite material and high toughness technology, which is applied in the field of high toughness Nb-doped W/TiC composite material and its preparation, can solve the problems of reducing the plastic toughness, recrystallization brittleness, and irradiation brittleness of tungsten-based materials, and achieve the improvement of grain boundary Effects of binding force, improving toughness, and improving performance

Active Publication Date: 2014-12-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tungsten-based materials have brittleness problems: low temperature brittleness, recrystallization brittleness and radiation brittleness, etc.
[0003] At present, there are few studies on the addition of alloying elements to tungsten alloys. Although doping

Method used

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  • High-toughness Nb doped W/TiC composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Preparation of composite powder

[0016] According to the ratio of W-1.5wt%Nb-1wt%TiC, add a total of 22.5g of W powder, Nb powder and TiC powder into the ball mill tank for ball milling for 4 hours, the ball-to-material ratio is 20:1, and the speed is 400r / min. Obtain composite powder.

[0017] 2. Sintering of composite materials

[0018] The composite powder was pressed at a pressure of 300MPa to obtain a compact, and the compact was sintered in a high-temperature sintering furnace. During the sintering process, Ar was used as a protective gas, kept at 2200°C for 2h, cooled to 1000°C and then cooled to At room temperature, the Nb-doped W / TiC composite material is obtained. During the sintering process, the heating rate was 5°C / min, and the cooling rate was 5°C / min. The thermal shock energy of the composite material obtained after sintering at 700°C is 116.6KJ / m 2 .

Embodiment 2

[0020] 1. Preparation of composite powder

[0021] According to the ratio of W-3wt%Nb-1wt%TiC, a total of 25g of W powder, Nb powder and TiC powder were added to the ball mill tank for ball milling for 4 hours, the ball-to-material ratio was 20:1, and the speed was 400r / min to obtain a composite Powder.

[0022] 2. Sintering of composite materials

[0023] Press the composite powder with a unit pressure of 300MPa to obtain a green compact, put the green compact into a high-temperature sintering furnace for sintering, use Ar as a protective gas during the sintering process, keep it at 2200°C for 2 hours, cool down with the furnace after cooling down to 1000°C to room temperature, the Nb-doped W / TiC composite material is obtained. During the sintering process, the heating rate was 5°C / min, and the cooling rate was 5°C / min. The thermal shock energy of the composite material obtained after sintering at 700°C is 80.9KJ / m2.

Embodiment 3

[0025] 1. Preparation of composite powder

[0026] According to the ratio of W-1wt%Nb-1wt%TiC, a total of 28g of W powder, Nb powder and TiC powder were added to the ball mill pot for ball milling for 4h, the ball-to-material ratio was 20:1, and the speed was 400r / min to obtain a composite Powder.

[0027] 2. Sintering of composite materials

[0028] Press the composite powder with a unit pressure of 300MPa to obtain a green compact, put the green compact into a high-temperature sintering furnace for sintering, use Ar as a protective gas during the sintering process, keep it at 2200°C for 2 hours, cool down with the furnace after cooling down to 1000°C to room temperature, the Nb-doped W / TiC composite material is obtained. During the sintering process, the heating rate was 5°C / min, and the cooling rate was 5°C / min. The thermal shock energy of the composite material obtained after sintering at 700°C is 75.4KJ / m 2 .

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Abstract

The invention discloses a high-toughness Nb doped W/TiC composite material and a preparation method thereof, wherein the high-toughness Nb doped W/TiC composite material comprises the following elements in percentage by mass: 1-3% of Nb, 1% of TiC, and the balance of W; and the preparation method comprises the following steps: W powder, Nb powder and TiC powder are put in a ball milling tank for ball milling 4 hours to obtain a composite powder body; the composite powder body is pressed by the pressure of 300 MPa to obtain a pressed shape; and the pressed shape is put in a high-temperature sintering furnace for sintering to obtain the Nb doped W/TiC composite material. The composite material can effectively improve the toughness of a tungsten-based material.

Description

1. Technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a high-toughness Nb-doped W / TiC composite material and a preparation method thereof. 2. Background technology [0002] In the ITER international project, the Tokamak, which uses a strong magnetic field to confine high-temperature plasma, is the most promising device for realizing controllable thermonuclear fusion reactions. In fusion devices, plasma-facing components face extremely harsh service environments, and extremely high requirements are placed on plasma-facing materials (PFM). PFM must have high thermal conductivity, high melting point, high thermal shock resistance, and Low vapor pressure, low sputtering yield, low radiation radioactivity and other properties. Tungsten material is considered to be the most likely candidate material for future fusion reactor PFM. However, tungsten-based materials have brittleness problems: low temperature britt...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05
Inventor 罗来马谌景波吴玉程程继贵
Owner HEFEI UNIV OF TECH
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