Tungsten-based plasma facing material and preparation method thereof

A plasma, tungsten-based technology, applied in the field of ionic materials, can solve the problems of limited development and application, low production efficiency, complex process, etc., and achieve low hydrogen isotope retention, low vapor pressure, and low sputtering yield. Effect

Active Publication Date: 2012-07-11
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, foreign countries have begun to study the preparation of long-fiber toughened tungsten-based PFM by chemical vapor deposition (C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] A tungsten-based plasma facing material, which is characterized in that it is made of tungsten powder and tungsten fiber as raw materials, and tungsten powder is selected according to the ratio of tungsten fiber to about 10%-30% of the volume of the matrix tungsten powder; A powder mixing method that does not damage tungsten fibers is used to make tungsten powder and tungsten fibers uniformly mixed and degassed at high temperature in a vacuum, and then sintered to prepare a bulk fiber toughened tungsten-based material using a hot isostatic pressing process, and the tungsten The powder is one of pure tungsten powder, tungsten rhenium alloy powder, and tungsten powder doped with carbides or oxides. The tungsten fiber is pure tungsten fiber or alloy fiber such as tungsten rhenium.

[0023] The tungsten-based plasma facing material is characterized in that the particle size of the pure tungsten powder is 0.1-20 μm, and the purity is greater than 99.5 wt%, and...

Example Embodiment

[0032] Example 2:

[0033] 1. Purchasing high-quality commercial doped tungsten wires and reduced tungsten powders. Requirements: The recrystallization temperature of doped tungsten wires must reach 2000K, the diameter should be about 10-300μm, and the tensile strength should be above 2.5GPa; reduced tungsten powder impurities The content should be as low as possible (purity>99.5wt%) and the grain size as small as possible (<3μm) to improve the sintering quality;

[0034] 2. In order to improve the performance of the interface between tungsten fiber and tungsten matrix, it is necessary to use physical (chemical) vapor deposition or sol-gel methods to prepare an interlayer film on the tungsten wire, such as ZrO 2 , La 2 O 3 , Y 2 O 3 , C and other films / coatings;

[0035] 3. Short cut the tungsten wire with a diameter of about 10-300μm into a length of 1-5mm, then select the tungsten powder according to the ratio of the fiber to the matrix volume of about 10%-30% and mix it evenly in ...

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PUM

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Abstract

The invention discloses a tungsten-based plasma facing material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing tungsten powder and tungsten fiber by a powder mixing method which does not damage the tungsten fiber; and sintering to prepare a bulk fiber toughened tungsten-based material by a hot isostatic pressing process. The tungsten powder is one of pure tungsten powder, tungsten-rhenium alloy powder, and tungsten powder doped with carbide and oxide; and the tungsten fiber is a pure tungsten wire, a tungsten-rhenium alloy wire or the like. The tungsten-based plasma facing material has the advantages of high thermal conductivity, high melting point temperature, low sputtering yield, low hydrogen isotope retention and low vapor pressure, as well as low cost and greater toughness.

Description

technical field [0001] The invention relates to a plasma-facing material of a fusion stack, specifically a tungsten-based plasma-facing material and a preparation method thereof. Background technique [0002] Due to its high melting point, high sputtering threshold, high thermal conductivity, low vapor pressure, low hydrogen isotope retention and other excellent properties, tungsten materials are considered to be the plasma-oriented components for the preparation of the International Thermonuclear Experimental Reactor ITER and the future commercial demonstration reactor DEMO ( plasma-facing components, PFC) important candidate materials. However, the brittleness of tungsten is an important factor limiting its application in fusion reactor PFC. It is generally believed that there are three main sources of its brittleness: 1. The movement of a large number of dislocations in tungsten often requires high temperature to activate. Studies have shown that the plasticity of tungst...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C49/14C22C49/10C22C111/02
Inventor 罗广南赵四祥刘凤李强王万景谢春意
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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