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Preparation method for composite high-copper tungsten-copper nanopowder

A nano-composite, high-copper technology, applied in the field of powder metallurgy, can solve problems that are not conducive to the development and application of high-quality high-copper tungsten-copper alloys, and achieve the effect of fine particles, simple equipment, and uniform and small particle size

Active Publication Date: 2016-11-09
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the high-copper tungsten-based alloys are prepared by conventional direct mixing of tungsten and copper powders. There are fewer reports on the preparation of tungsten-copper composite powders with a copper content of more than 50%, which is very unfavorable for the development of high-quality high-copper tungsten-copper alloys. R&D and application

Method used

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  • Preparation method for composite high-copper tungsten-copper nanopowder

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[0019] A preparation method of high-copper tungsten-copper nanocomposite powder, comprising the following steps:

[0020] Step 1. Prepare copper nitrate, ammonium metatungstate and oxalic acid solutions respectively for later use, wherein the solvents in the three solutions are water-ethanol mixed solutions, and the molar ratio of water and ethanol is 1:0.5~1:2;

[0021] Step 2. Mix the three solutions prepared in step 1 according to the molar ratio of copper nitrate, ammonium metatungstate and oxalic acid as 1: (0.04-0.2): (1-1.5), and then add mass NaOH solution with a concentration of 30~60%, until the pH value of the mixed solution is ≤3, and set aside;

[0022] Step 3: React the mixed solution prepared in Step 2 for 2-4 hours under stirring conditions at a temperature of 60-90°C, then filter and wash the reaction product, and dry it for 18-20 hours at a temperature of 80-95°C. Prepare the precursor;

[0023] Step 4. Calcining the precursor prepared in step 3 at a temper...

Embodiment 1

[0028] A preparation method of high-copper tungsten-copper nanocomposite powder, comprising the following steps:

[0029] Step 1, prepare copper nitrate, ammonium metatungstate and oxalic acid solution respectively, standby; Wherein, solvent is the mixed solution of water-ethanol, and the molar ratio of water and ethanol is 1: 0.5;

[0030] Step 2. Mix the three solutions prepared in step 1 according to the molar ratio of copper nitrate, ammonium metatungstate and oxalic acid as 1: 0.06: 1.05, and then add the NaOH solution with a mass concentration of 40% dropwise to the mixed solution. Until the pH value of the mixed solution is 0.5, set aside;

[0031] Step 3: React the mixed solution prepared in Step 2 for 4 hours at a temperature of 70°C under stirring, then filter and wash the reaction product, and dry it for 20 hours at a temperature of 80°C to obtain a precursor;

[0032] Step 4. Calcinate the precursor prepared in step 3 at a temperature of 500°C for 2 hours to obtai...

Embodiment 2

[0037] A preparation method of high-copper tungsten-copper nanocomposite powder, characterized in that: comprising the following steps:

[0038] Step 1, preparing copper nitrate, ammonium metatungstate and oxalic acid solutions respectively for subsequent use; wherein, the solvent is a mixed solution of water-ethanol, and the molar ratio of water and ethanol is 1:2;

[0039] Step 2. Mix the three solutions prepared in step 1 according to the molar ratio of copper nitrate, ammonium metatungstate and oxalic acid as 1: 0.15: 1.05, and then add the NaOH solution with a mass concentration of 60% dropwise to the mixed solution. Until the pH value of the mixed solution is 2, set aside;

[0040] Step 3: React the mixed solution prepared in Step 2 for 4 hours at a temperature of 85°C under stirring conditions, then filter and wash the reaction product, and dry it at a temperature of 95°C for 20 hours to obtain a precursor;

[0041] Step 4. Calcinate the precursor prepared in step 3 at...

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Abstract

The invention discloses a preparation method for composite high-copper tungsten-copper nanopowder. The preparation method comprises the following steps: first preparing copper nitrate, ammonium meta-tungstate and oxalic acid solutions, then uniformly mixing the three prepared solutions according to the molar ratio of copper nitrate, ammonium meta-tungstate and oxalic acid of 1:(0.04-0.2):(1-1.5), adding dropwise an NaOH solution at a mass concentration of 30 to 60 percent into a mixed solution until the Ph value of the mixed solution is less than or equal to 3, performing reaction on the prepared mixed solution for 2 to 4h with stirring at 60 to 90 DEG C, filtering and washing a reaction product, drying the reaction product for 18 to 20h at 80 to 95 DEG C to obtain a precursor, and finally sequentially performing calcination, reduction and cooling on the prepared precursor to obtain granular high-copper tungsten-copper powder. The preparation method is easy to operate, and composite high-copper tungsten-based micro-nano powder with high dispersibility and uniformity can be effectively prepared.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a high-copper tungsten-copper alloy, in particular to a method for preparing a high-copper tungsten-copper alloy nanocomposite powder. Background technique [0002] Tungsten-copper composite material has the advantages of high density, high melting point, high strength, low expansion coefficient of tungsten and good thermal and electrical conductivity of copper, which makes it used as an upgraded product on a large scale in electric power, electronic machinery and other industries. At the same time, tungsten-copper composite materials have also been successfully applied to the military industry as missile nozzle materials and armor-piercing ammunition cover materials. With the further development of industry, the demand for high-performance tungsten-copper composite materials is becoming more and more urgent. However, due to the large difference between the melting poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B82Y40/00
CPCB82Y40/00B22F9/22B22F1/054
Inventor 魏世忠王喜然李秀青李继文潘昆明单康宁王长记
Owner HENAN UNIV OF SCI & TECH
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