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Tungsten/copper gradient material and preparation method thereof

A gradient material and purity technology, applied in the field of material preparation, can solve the problems of limited composition, uneven microstructure, low densification degree, etc., and achieve the effect of continuous gradient distribution of composition, uniform microstructure and high degree of densification

Active Publication Date: 2011-11-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is to lay down tungsten-copper powders with different composition ratios layer by layer, and pressurize and sinter at a temperature lower than the melting point of copper to obtain a tungsten / copper gradient material; this method has the problem of discontinuous gradient distribution of components and densification Low degree, uneven microstructure, restricted composition, etc.
The second is to obtain tungsten / copper gradient materials by hot-press welding tungsten-copper alloys with different composition ratios; this method also has the problem of discontinuous gradient distribution of components, and the tungsten / copper gradient materials prepared according to this process have more welds. interface, reducing the overall performance of the tungsten / copper gradient material
The third method is to obtain tungsten / copper gradient material by prefabricating gradient tungsten skeleton and then infiltrating copper; patent ZL200410009297.4 discloses a method for preparing tungsten / copper gradient material by infiltration-welding method, first preparing gradient porosity tungsten skeleton , and then infiltrate copper to obtain a transition layer with a tungsten-copper gradient distribution, and finally connect the tungsten / copper gradient layer to pure tungsten by thermocompression welding; this method has complex processes, high cost, and low efficiency.

Method used

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  • Tungsten/copper gradient material and preparation method thereof
  • Tungsten/copper gradient material and preparation method thereof
  • Tungsten/copper gradient material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing tungsten / copper gradient material, comprising the following steps:

[0036] The experimental raw materials used are: Al powder (purity 98.6%, 100 μm), W powder (purity 99.5%, 2.6-5 μm), Cu 2 O powder (purity 99%, 45 μm).

[0037] According to thermite (Al powder and Cu 2 O powder) composition molar ratio n Al : n Cu2O =2:3 to deploy the thermite raw material; then use absolute ethanol as the medium to mechanically activate on a planetary ball mill for 2 hours, then put it into an oven and dry it for 12 hours; put 200g of the dried raw material into a cylindrical steel mold (Φ40mmx80mm ) with a molding pressure of 15 MPa to obtain a thermite compact with a relative density of 50%. Then put the thermite compact into a quartz crucible with 10 mm thick loose tungsten powder, and the thermite compact will press the loose tungsten powder as a whole (such as figure 1 shown), then place the quartz crucible in the stainless steel reactor, and finally ...

Embodiment 2

[0042] A method for preparing tungsten / copper gradient material, comprising the following steps:

[0043] The experimental raw materials used are: Al powder (purity 99.0%, 10 μm), W powder (purity 99.7%, 2 μm), Cu 2 O powder (purity 99.2%, 10 μm).

[0044]According to thermite (Al powder and Cu 2 O powder) composition molar ratio n Al : n Cu2O = 2:3 to prepare thermite raw materials; then use absolute ethanol as the medium to mechanically activate on a planetary ball mill for 0.5 hours, and then put it into an oven at 80°C for 10 hours; put 250g of the dried raw materials into a cylindrical steel Molded in a mold (Φ40mmx80mm), the molding pressure is 15MPa, and pressed for 5min to obtain the thermite compact. Then put the thermite compact into a quartz crucible with 10 mm thick loose tungsten powder, the thermite compact will press the loose tungsten powder as a whole, then place the quartz crucible in a stainless steel reactor, and finally put Install the stainless steel...

Embodiment 3

[0046] A method for preparing tungsten / copper gradient material, comprising the following steps:

[0047] The experimental raw materials used are: Al powder (purity 98.6%, 150 μm), W powder (purity 99.5%, 25 μm), Cu 2 O powder (purity 99.6%, 100 μm).

[0048] According to thermite (Al powder and Cu 2 O powder) composition molar ratio n Al : n Cu2O =2:3 to prepare thermite raw materials; then use absolute ethanol as the medium to mechanically activate on a planetary ball mill for 24 hours, and then put it into an oven at 100°C to dry for 10 hours; put 100g of dried raw materials into a cylindrical steel Molded in a mold (Φ40mmx80mm), the molding pressure is 40MPa, and pressed for 20min to obtain the thermite compact. Then put the thermite compact into a quartz crucible with 10 mm thick loose tungsten powder, the thermite compact will press the loose tungsten powder as a whole, then place the quartz crucible in a stainless steel reactor, and finally put Install the stainles...

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Abstract

The invention discloses a tungsten / copper gradient material and a preparation method thereof. The tungsten content and copper content in the tungsten / copper gradient material are in continuous gradient distribution, the tungsten content is gradually increased from one side to the other side, and the copper content is gradually reduced; and the gradient material has high densifying degree, uniformmicrostructure, continuous ingredient gradient distribution and good overall performance. The preparation method comprises the following steps of: loosely loading W powder to the bottom of a quartz crucible; mixing Al powder and Cu2O powder, compacting, then placing the mixed powder of the Al powder and the Cu2O powder on the W powder in the quartz crucible, placing the quartz crucible in a supergravity infiltration device, vacuumizing, and electrifying a tungsten wire to initiate a reaction under the supergravity condition so as to obtain the tungsten / copper gradient material; and the preparation method disclosed by the invention has a simple process, low cost and high efficiency.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a tungsten / copper gradient material and a method for directly preparing the tungsten / copper gradient material by infiltration technology in a supergravity field. Background technique [0002] Tungsten / copper gradient material is a composite material with continuous gradient distribution that combines the high melting point, high strength and good creep resistance of tungsten with the high thermal conductivity, high electrical conductivity and good plasticity of copper. It has great application prospects in the electronics, defense and nuclear energy industries. Since 1985, many researchers have used other methods to successfully verify the excellent properties of tungsten / copper gradient materials. However, since tungsten and copper are pseudo-alloys that are completely insoluble, the two metals with very different properties are continuously tested. Gradient and dense combin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00B22F3/23
Inventor 郭世斌李江涛陈义祥麦培林赵培刘光华林志明杨筠
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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