Method for preparing tungsten/copper functional gradient material by infiltration - weld method

A technology of functionally graded materials and welding methods, applied in chemical instruments and methods, layered products, metal layered products, etc., to achieve the effect of simple preparation and good thermal shock resistance

Inactive Publication Date: 2005-03-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Ge Changchun et al [a tungsten / copper gradient material used as a fusion reactor divertor component and its preparation method, patent application number 00136770.6] obtained the W / Cu gradient material by rapid sintering under 5Gpa ultra-high pressure, but only Can provide samples with diameter less than 20mm

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  • Method for preparing tungsten/copper functional gradient material by infiltration - weld method

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Experimental program
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Embodiment

[0029] Embodiment: Adopt the comparison of W / Cu gradient material prepared with different particle size tungsten powder and pore-forming agent content

[0030] If the amount of pore forming agent (stearic acid, the same below) is too large, the tungsten skeleton will be severely foamed and deformed. If the content of the pore forming agent is too small, sufficient porosity of the tungsten skeleton cannot be ensured. We studied the preparation of tungsten skeletons with different contents of pore-forming agents. The particle size of the tungsten powder used is 3 μm. It was found that when the content of the pore-forming agent is greater than 80%, the tungsten skeleton is easy to foam and deform, and a satisfactory tungsten skeleton cannot be obtained. When the content of the pore-forming agent is less than 5%, the molding is more difficult, so in the following experiments, the This is designed for reference.

[0031] In addition to the content of the pore-forming agent, the ...

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Abstract

The invention relates to a new method of making tungsten-copper functional gradient material, which consists of pure tungsten layer and tungsten-copper gradient transit layer. First, make the gradient hole-framework with boring fluid of percent 5~80 volume ratio and tungsten powder of 1~20 micron. Infiltrate copper fluid to make the tungsten-copper gradient transit layer. Weld the W / Cu gradient layer and the pure tungsten by hot pressure. The process is following: mix the material and mould them, then frit framework, Infiltrate copper, weld and check. The method has both the advantage of melt-casting technique and jointing technique. The tungsten-copper functional gradient material made by this method is better heatproof and suited to electric sealing material, heat sinking material, and anti-high temperature plasma scouring unit such as the first layer material in nuclear fusion.

Description

technical field [0001] The invention belongs to the technical field of tungsten / copper functionally graded materials, and in particular provides a method for preparing tungsten / copper functionally graded materials by an infiltration-welding method. Background technique [0002] Tungsten-copper composite material is a type of composite material composed of tungsten and copper that is evenly distributed in two phases and neither solid solution nor compound. And copper's high conductivity, high thermal conductivity, plasticity and ease of processing, and copper can absorb a large amount of arc energy when it evaporates at high temperature in the arc, reduce the arc temperature, improve the use conditions and reduce the effect of electric corrosion. Due to the above advantages, tungsten-copper composite materials were first used as electrical contacts and electrode materials, and more and more used as nozzle throat linings, electron beam targets, etc. in aerospace, nuclear indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B32B15/01
Inventor 周张健葛昌纯
Owner UNIV OF SCI & TECH BEIJING
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