Preparation method of copper-coated tungsten composite powder

A technology of composite powder and tungsten powder, which is applied in the direction of liquid chemical plating, coating, metal material coating process, etc., can solve the problems of poor wettability of powder sintering, poor uniformity of mechanical mixing, poor working conditions, etc. , to achieve the effect of improving tissue uniformity, uniform coating thickness and improving thermal conductivity

Inactive Publication Date: 2009-09-23
UNIV OF SCI & TECH BEIJING
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  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of polluted environment, poor working conditions, poor mechanical mixing uniformity and poor powder sintering wettability existing in the current nitrate decomposition technology (chemical mixing method). Improve the sinterability of tungsten-copper alloys, increase the density of sintered materials and other material properties

Method used

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  • Preparation method of copper-coated tungsten composite powder
  • Preparation method of copper-coated tungsten composite powder
  • Preparation method of copper-coated tungsten composite powder

Examples

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Effect test

example 1

[0023] Prepare 100gW-10Cu composite powder. Take 90g of 30μm tungsten powder. First soak with 10g / L NaOH for 10 minutes, then remove the upper solution and wash with deionized water. Then soak the tungsten powder with 10% HCl for 20 minutes, then remove the upper solution and wash the tungsten powder.

[0024] Get 38.9g copper sulfate pentahydrate, and dissolve with deionized water, be made into the copper sulfate solution of 13g / L. Get 156g of potassium sodium tartrate and dissolve it with deionized water. Then the copper sulfate solution was slowly added to the sodium potassium tartrate solution under stirring to obtain a light blue suspension. At this time, NaOH was dissolved and added to the above light blue suspension, the solution turned dark blue, and the pH value was adjusted to 12. And 0.03 g of bipyridine was added. At this time, tungsten powder and 60ml of formaldehyde were added to the above dark blue solution. Heat it in a constant temperature water bath at ...

example 2

[0026] Prepare 200gW-10Cu composite powder. Take 180g of 30μm tungsten powder. First soak with 10g / L NaOH for 10 minutes, then remove the upper solution and wash with deionized water. Then soak the tungsten powder with 10% HCl for 20 minutes, then remove the upper solution and wash the tungsten powder.

[0027] Get 77.8g copper sulfate pentahydrate, and dissolve with deionized water, be made into the copper sulfate solution of 13.5g / L. Get 311g of potassium sodium tartrate and dissolve it with deionized water. Then the copper sulfate solution was slowly added to the sodium potassium tartrate solution under stirring to obtain a light blue suspension. At this time, NaOH was dissolved and added to the above light blue suspension, the solution turned dark blue, and the pH value was adjusted within the range of 12.5. And 0.11 g of bipyridine was added. At this time, tungsten powder and 86.4ml formaldehyde were added to the above dark blue solution. Heat in a constant temperat...

example 3

[0029] Prepare 100gW-15Cu composite powder. Take 85g of 10μm tungsten powder. First soak with 10g / L NaOH for 10 minutes, then remove the upper solution and wash with deionized water. Then soak the tungsten powder with 10% HCl for 20 minutes, then remove the upper solution and wash the tungsten powder.

[0030] Get 58.35g copper sulfate pentahydrate, and dissolve with deionized water, be made into the copper sulfate solution of 14g / L. Get 233g of potassium sodium tartrate and dissolve it with deionized water. Then the copper sulfate solution was slowly added to the sodium potassium tartrate solution under stirring to obtain a light blue suspension. At this time, NaOH was dissolved and added to the above light blue suspension, the solution turned dark blue, and the pH value was adjusted to 13. And 0.12 g of bipyridine was added. At this time, tungsten powder and 75.1 ml of formaldehyde were added to the above dark blue solution. Heat in a constant temperature water bath at...

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Abstract

The invention discloses a preparation method of copper-coated tungsten composite powder, belonging to the technical field of powder metallurgy. Corresponding tungsten powder and blue vitriod are employed according to the weight ratio of composite powder to be prepared and the tungsten powder is pre-treated; copper sulphate and seignette sol are dissolved into solution; bipyridine is added and NaOH is used to adjust pH value to 12-14; an appropriate amount of formaldehyde solution and the tungsten powder are added; the mixture is heated and then stirred continuously in constant-temperature bathing at 30-60 DEG C until the tungsten powder is red; the tungsten powder is washed, dried, reduced and annealed, thereby obtaining copper-coated tungsten composite powder. The preparation method of copper-coated tungsten composite powder has wide application range and is applicable to tungsten-powder coating coppers with different finenesses and shapes. The preparation method of copper-coated tungsten composite powder prepares copper-coated tungsten composite powder in different content ratios according to different requirements. The copper-coated tungsten composite powder obtained by the method of the invention has excellent sintering activity, thereby improving the combination property of tungsten copper alloy.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing copper-clad tungsten composite powder for producing tungsten-copper alloys. Background technique [0002] Tungsten-copper alloy is a two-phase mixed structure composed of tungsten with a body-centered cubic structure and copper with a face-centered cubic structure, which is neither solid solution nor intermetallic compound, and is usually called a pseudo-alloy. Therefore, it not only has the characteristics of high strength, high hardness, and low expansion coefficient of tungsten, but also has the characteristics of high plasticity and good electrical and thermal conductivity of copper. This unique comprehensive performance makes tungsten copper alloy widely used in electrical contact materials and electrode materials. [0003] When preparing W-Cu alloy, the usual production process is to mix tungsten powder and copper powder uniform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/40
Inventor 林涛王楠邵慧萍郭志猛刘兆方高治山罗骥郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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