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Preparation method of copper-cladded silver-clad tungsten composite clad powder

A composite powder and silver-coated technology, which is applied in the direction of liquid chemical plating, coating, metal material coating process, etc., can solve the problems of poor interface wettability and difficult realization of tungsten-copper characteristic structure, and achieve high sintering activity , wide application range and obvious effects

Active Publication Date: 2013-12-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the characteristic structure of tungsten-copper in the preparation of tungsten-copper composite materials is difficult to realize and the interface wettability is poor. The method of composite coating is firstly plated on the surface of tungsten powder with a thickness of nanometer layer by electroless plating. Silver layer, and then quantitatively chemically coat copper to obtain a composite coated powder of copper-coated silver-coated tungsten powder, realize the addition of sintering aids in a fixed area, improve the sinterability of tungsten-copper composite powder, and improve the tungsten-copper interface Wettability, to obtain the ideal structure of tungsten-copper composite materials, thereby improving the comprehensive performance of tungsten-copper composite materials

Method used

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  • Preparation method of copper-cladded silver-clad tungsten composite clad powder
  • Preparation method of copper-cladded silver-clad tungsten composite clad powder
  • Preparation method of copper-cladded silver-clad tungsten composite clad powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Prepare 26.32g of W-Ag-Cu (W-5Cu) composite coating powder.

[0041] Weigh 5g of silver nitrate, dissolve the silver nitrate with 465ml of deionized water, stir and add 35ml of ammonia water with a mass concentration of 28%, the silver nitrate solution first becomes turbid and then becomes clear, and then adjust the pH with a 17% dilute nitric acid solution 11 to 11.2 to obtain a silver complex solution, respectively take 2.5ml of formaldehyde with a mass concentration of 38%, 228ml of absolute ethanol and 295ml of deionized water and mix them evenly to obtain a silver plating reducing solution. Weigh the cleaned and sensitized activated Add 25g of tungsten powder with an average particle size of 1μm into the silver-plating reducing solution, and slowly add it into the silver complex solution under constant stirring. After stirring for 0.5h, wash the powder 5 times to obtain silver-coated tungsten composite powder. . Take by weighing 5.14g copper sulfate pen...

Embodiment 2

[0043] Prepare 62.5g of W-Ag-Cu (W-20Cu) composite coating powder. Weigh 6g of silver nitrate, dissolve the silver nitrate with 455ml of deionized water, stir and add 45ml of ammonia water with a mass concentration of 28%, the silver nitrate solution first becomes turbid and then becomes clear, and then adjust the pH to 11.5-11.7 with dilute nitric acid solution, Take 4ml of formaldehyde with a mass concentration of 38%, 248ml of absolute ethanol, and 298ml of deionized water and mix them evenly to obtain a silver plating reducing solution. Weigh the tungsten powder with an average particle size of 10 μm after cleaning and sensitization and activation ( figure 1 ) 50g into the silver-plating reducing solution, and slowly add the silver complex solution under the condition of constant stirring, after stirring and reacting for 0.8h, the powder was cleaned 5 times, and the silver-coated tungsten composite powder was obtained ( image 3 and Figure 4 shown). Take by weighing 48....

Embodiment 3

[0045] Prepare 42.86g of W-Ag-Cu (W-30Cu) composite coating powder. Weigh 1.6g of silver nitrate, dissolve the silver nitrate with 90ml of deionized water, stir and add 10ml of ammonia water with a mass concentration of 28%, the silver nitrate solution becomes turbid first and then becomes clear, and then adjust the pH to 12~ with sodium hydroxide solution 12.2, take 1.2ml of formaldehyde with a mass concentration of 38%, 55ml of absolute ethanol and 64ml of deionized water and mix them evenly to obtain a silver plating reducing solution, weigh 30g of tungsten powder with an average particle size of 20μm after cleaning and sensitization and activation, and add Silver-plating reducing solution, and slowly add silver complex solution under the condition of constant stirring, after stirring and reacting for 1h, the powder is cleaned 5 times to obtain silver-coated tungsten composite powder ( Figure 7 and Figure 8 shown). Take by weighing 50.22g copper sulfate pentahydrate, di...

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Abstract

The invention provides a preparation method of copper-clad silver-clad tungsten composite clad powder, which belongs to the technical field of powder processing and preparation in powder metallurgy. Tungsten powder is washed with alkali and acid and is sensitized and activated, so that preprocessed powder is produced, the surfaces of the preprocessed powder are cladded with silver, so that nano silver-cladded tungsten composite powder is produced, and finally, the silver-clad tungsten composite powder is cladded with copper, so that the copper-cladded silver-cladded tungsten composite clad powder, the copper content of which varies between 5 percent and 50 percent, is obtained. The cladding copper layer and the cladding silver layer in the composite clad powder prepared by the preparation method are uniform and intact, have high purity, and can be controlled in terms of quality. The introduction of the silver layer can remarkably improve the wettability of the tungsten-copper interface. The composite clad powder has good sintering property, the comprehensive properties of tungsten-copper composite material, such as thermal property and mechanical property, can be enhanced, and the composite clad powder can be used as material for the preparation of high-performance tungsten-copper composite material, and has a broad application prospect in the fields of electronic packaging, high-temperature materials, electric contact materials and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy powder treatment and preparation, and in particular relates to a method for preparing a copper-coated silver-coated tungsten composite coated powder. Background technique [0002] Tungsten-copper alloy is a two-phase composite material composed of high-strength, high-hardness, low-thermal-expansion-coefficient tungsten and high-conductivity-thermal-conductivity copper, which are neither solid solution nor intermetallic compound. By adjusting the proportion of components in the tungsten-copper composite material, a tungsten-copper composite material with high thermal conductivity, adjustable coefficient of thermal expansion (CTE) and very good mechanical properties can be obtained, which has been obtained in the fields of electrical contact materials and electrode materials. Wide range of applications. [0003] Due to the large difference in melting point of W-Cu, it is difficult to diss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/44C23C18/40
Inventor 张联盟陈文书沈强罗国强王传彬李美娟
Owner WUHAN UNIV OF TECH
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