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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 (CVD), but the process is complicated, the production efficiency is low, and the anisotropy of long fibers may limit its development and application.

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] A tungsten-based plasma-facing material is characterized in that: it is made of tungsten powder and tungsten fiber, and the tungsten powder is selected according to the ratio of tungsten fiber to the matrix tungsten powder volume ratio of about 10%-30%; it is made of It is obtained by mixing tungsten powder and tungsten fiber evenly by using a powder mixing method that will not damage tungsten fiber, degassing at high temperature in vacuum, and then sintering by hot isostatic pressing to prepare a bulk fiber toughened tungsten-based material, and the tungsten The powder is one of pure tungsten powder, tungsten-rhenium alloy powder, tungsten powder doped with carbide or oxide, and the tungsten fiber is pure tungsten fiber or tungsten-rhenium alloy fiber.

[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 >99.5wt%, and the alloy in the tungsten-rhenium alloy powder or al...

Embodiment 2

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

[0034] 2. In order to improve the interface properties between tungsten fiber and tungsten substrate, it is necessary to prepare an intermediate layer film on the tungsten wire by physical (chemical) vapor deposition or sol-gel methods, such as ZrO 2 , La 2 o 3 , Y 2 o 3 , C and other films / coatings;

[0035] 3. Chopped tungsten wires with a diameter of about 10-300μm into 1-5mm lengths, then selected tungsten powder according to the ratio of fiber to matrix volume of about 10%-30%, and mixed them evenly in a...

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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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