Simple preparation method for nano-grade tungsten-copper precursor powder

A precursor powder and nano-scale technology, applied in the direction of nanotechnology, can solve the problems of long production cycle and high energy consumption, and achieve the effects of shortened production cycle, reduced energy consumption, and simple preparation methods

Active Publication Date: 2018-07-31
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of long production cycle and high energy consumption in the existing hydrothermal method for preparing powder, and to propose a simple preparation method for nano-scale tungsten-copper precursor powder

Method used

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  • Simple preparation method for nano-grade tungsten-copper precursor powder
  • Simple preparation method for nano-grade tungsten-copper precursor powder
  • Simple preparation method for nano-grade tungsten-copper precursor powder

Examples

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Effect test

Embodiment 1

[0027] A simple preparation method of nano-scale tungsten-copper precursor powder adopts the following production steps:

[0028] Step 1. According to the mass percentage of W in the target composite powder is 50-60%, and the mass percentage of Cu is 40-50%, weigh sodium tungstate dihydrate and copper nitrate trihydrate, and prepare them respectively to a concentration of 0.8 mol / L solution;

[0029] Step 2, adding excessive ammoniacal liquor to the obtained copper nitrate trihydrate solution, and making it fully mixed at 30°C, so that sufficient copper complex ions are produced in the solution, and the ammoniacal liquor can be added in excess of 3-5%;

[0030] Step 3: Drop sodium tungstate solution into the solution obtained in Step 2 at a rate of 1~3 drops / s, then add ammonia water or nitric acid to adjust the pH value of the mixed solution to 4.0~6.2, and mix it in a magnetic stirrer at 60r / min speed fully stirred for 5h;

[0031] Step 4. Put the mixed solution obtained ...

Embodiment 2

[0035] A simple preparation method of nano-scale tungsten-copper precursor powder adopts the following production steps:

[0036] Step 1. According to the mass percentage of W in the target composite powder is 60-70%, and the mass percentage of Cu is 30-40%, weigh sodium tungstate dihydrate and copper nitrate trihydrate, and prepare them respectively to a concentration of 0.6 mol / L solution;

[0037] Step 2, adding excessive ammoniacal liquor to the obtained copper nitrate trihydrate solution, and making it fully mixed at 30°C, so that sufficient copper complex ions are produced in the solution, and the ammoniacal liquor is added in excess of 5-8%;

[0038] Step 3: Drop sodium tungstate solution into the solution obtained in Step 2 at a rate of 3~5 drops / s, then add ammonia water or nitric acid to adjust the pH value of the mixed solution to 4.0~6.2, and mix it in a magnetic stirrer at 60r / min speed fully stirred for 4h;

[0039] Step 4. Put the mixed solution obtained in S...

Embodiment 3

[0043] A simple preparation method of nano-scale tungsten-copper precursor powder adopts the following production steps:

[0044] Step 1. According to the mass percentage of W in the target composite powder is 70-80%, and the mass percentage of Cu is 20-30%, weigh sodium tungstate dihydrate and copper nitrate trihydrate, and prepare them respectively to a concentration of 0.4 mol / L solution;

[0045] Step 2, adding excessive ammoniacal liquor to the obtained copper nitrate trihydrate solution, and making it fully mixed at 30°C, so that sufficient copper complex ions are produced in the solution, and the ammoniacal liquor is excessively 8 to 10% when added;

[0046] Step 3: Drop sodium tungstate solution into the solution obtained in Step 2 at a rate of 5-8 drops / s, then add ammonia water or nitric acid to adjust the pH value of the mixed solution to 4.0-6.2, and mix it in a magnetic stirrer at 60r / min speed fully stirred for 3h;

[0047] Step 4. Put the mixed solution obtai...

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Abstract

The invention discloses a simple preparation method for nano-grade tungsten-copper precursor powder. The method comprises the steps that a corresponding solution is prepared by taking tungstic acid sodium salt dihydrate and copper nitrate hydrate as raw materials, then a sodium tungstate solution is dropped into a copper nitrate solution containing copper complexing ions with the speed of 1-10 drops per second, then the pH value of the mixed solution is adjusted by using ammonia water or nitric acid, and then the mixed solution is directly put into a vacuum drying oven to generate thermochemical reaction, so that the nano-grade tungsten-copper precursor powder is prepared. By utilizing the method, the tungsten-copper precursor powder which is uniform in mixing, fine in particle and high inpurity can be prepared, and compared with a hydrothermal method, the method has the significant characteristics that the production period is short, a reaction kettle is not needed, and the preparation cost is reduced.

Description

technical field [0001] The invention relates to the field of powder preparation in powder metallurgy technology, in particular to a simple preparation method of nano-scale tungsten-copper precursor powder. Background technique [0002] The preparation of tungsten-copper composite materials by powder metallurgy is developing and optimized in the direction of high density and high performance, and the quality of powder metallurgy products has a great relationship with the performance of powder. Therefore, the preparation of dense tungsten-copper composite materials puts forward higher technical requirements for the synthesis preparation and molding process of its powder. Due to the poor solubility of tungsten and copper, it is not easy to obtain a completely dense tungsten-copper composite material. And the research results show that the higher the tungsten content, the more the densification process of the material depends on the particle size of the powder. Therefore, the u...

Claims

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Application Information

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IPC IPC(8): B22F9/22B82Y40/00
CPCB22F9/22B82Y40/00
Inventor 马窦琴谢敬佩陈艳芳苌清华王爱琴王文焱宋亚虎
Owner HENAN UNIV OF SCI & TECH
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