A low-temperature preparation method of pure nano w-cu composite powder

A composite powder, pure technology, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of decreased electrical and thermal conductivity of alloys, low yield of nanoparticles, increased impurity content, etc., to achieve lower synthesis temperature, method Simple and easy to operate, the effect of uniform powder particle size distribution

Active Publication Date: 2020-04-03
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the long-term ball milling in the mechanical alloying method increases the impurity content in the powder, which reduces the electrical and thermal conductivity of the final prepared alloy, and the grain structure is prone to rapid coarsening during subsequent sintering due to the high defect density inside the powder particles after ball milling. The sol-gel method can prepare powder particles with a particle size reduced to tens of nanometers, but the yield of nanoparticles prepared by this method is low, and it is difficult to add other elements to prepare multi-component alloys; other such as spray drying, mechanical- Thermochemical synthesis and other methods are difficult to control the size and distribution uniformity of nanoparticles, and the applicable material system is limited

Method used

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  • A low-temperature preparation method of pure nano w-cu composite powder
  • A low-temperature preparation method of pure nano w-cu composite powder
  • A low-temperature preparation method of pure nano w-cu composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using micron-sized tungsten powder and nano-sized aluminum powder as raw materials, the molar ratio of aluminum: tungsten is 3:1, and the mass ratio of grinding balls to powder is 22:1. Put the grinding balls and powder in a vacuum glove box Put it into a ball mill tank for ball milling, the speed is 400r / min, the ball milling time is 25h, and the powder is scraped every 5h to avoid cold welding to obtain tungsten-aluminum composite powder. The obtained tungsten-aluminum composite powder was corroded by adding NaOH solution with a concentration of 1mol / L for 15 hours, and suction filtered. During the process, ethanol and deionized water were added to clean the powder, and then dried in a vacuum oven at 60°C for 1 hour to obtain pure Nanoporous tungsten powder, its phase is as figure 1 shown. Add the obtained porous tungsten powder into the ethanol solution of copper chloride with a concentration of 0.2g / mL, stir to make the copper chloride solution enter the pores of p...

Embodiment 2

[0024] Using micron-sized tungsten powder and nano-sized aluminum powder as raw materials, according to the molar ratio of aluminum: tungsten is 4:1, the mass ratio of grinding balls to powder is 20:1, put the grinding balls and powder in a vacuum glove box Put it into a ball mill tank for ball milling, the speed is 500r / min, the ball milling time is 20h, and the powder is scraped every 5h to avoid cold welding to obtain tungsten-aluminum composite powder. The obtained tungsten-aluminum composite powder was corroded by adding NaOH solution with a concentration of 1mol / L for 20 hours, and suction filtered. During the process, ethanol and deionized water were added to clean the powder, and then dried in a vacuum oven at 70°C for 1 hour to obtain pure The nanoporous tungsten powder, its microstructure is as follows image 3 shown. Add the obtained porous tungsten powder into the ethanol solution of copper chloride with a concentration of 0.2g / mL, stir to make the copper chloride...

Embodiment 3

[0026] Using micron-sized tungsten powder and nano-sized aluminum powder as raw materials, according to the molar ratio of aluminum: tungsten is 5:1, the mass ratio of grinding balls to powder is 25:1, put the grinding balls and powder in a vacuum glove box Put it into a ball mill tank for ball milling, the speed is 600r / min, the ball milling time is 30h, and the powder is scraped every 5h to avoid cold welding to obtain tungsten-aluminum composite powder. The obtained tungsten-aluminum composite powder was corroded for 25 hours by adding NaOH solution with a concentration of 1mol / L, and suction filtered. During the process, ethanol and deionized water were added to clean the powder, and then dried in a vacuum oven at 50°C for 2 hours to obtain pure Nanoporous tungsten powder, its TEM morphology is as follows Figure 5shown. Add the obtained porous tungsten powder into the ethanol solution of copper chloride with a concentration of 0.2g / mL, stir, so that the copper chloride s...

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Abstract

The invention discloses a low-temperature preparation method of pure nanometer W-Cu composite powder, which belongs to the technical field of refractory metal and powder metallurgy. Using micron-sized tungsten powder and nano-sized aluminum powder as raw materials, high-energy ball milling is carried out by means of mechanical alloying, and Al is solid-dissolved into the W matrix to prepare W‑Al composite powder; after NaOH solution corrodes Al, nanoporous particles can be obtained. Tungsten powder, add copper chloride alcohol solution and oxalic acid alcohol solution respectively, coat a layer of copper oxalate in the gap and surface, after heating and reduction, copper oxalate decomposes into copper and carbon dioxide, carbon dioxide is removed with the flowing argon, and the resulting Copper clads the surface of the tungsten pores. Due to the low reduction temperature, the particle growth is very limited, so that the nano-pure tungsten-copper composite powder with a particle size below 50nm is obtained.

Description

technical field [0001] The invention relates to a preparation method for rapidly preparing nanoscale W-Cu composite powder at low temperature, and belongs to the technical field of refractory metal and powder metallurgy. Background technique [0002] The binary composite material composed of refractory metal W and non-ferrous metal Cu not only maintains the characteristics of high melting point and high hardness of refractory metal, but also has the properties of non-ferrous metal such as thermal conductivity, electrical conductivity, and good plasticity; at the same time, due to the refractory metal and non-ferrous metal The physical properties of metals vary greatly, which in turn creates new and unique properties for refractory / non-ferrous metal alloys. Therefore, refractory / non-ferrous metal alloys have high temperature resistance, high thermal conductivity, low thermal expansion coefficient, high resistance to arc erosion, and high temperature self-cooling properties th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00B22F1/02B22F9/30B82Y40/00
CPCB82Y40/00B22F9/04B22F9/30B22F2009/041B22F2998/10B22F1/07B22F1/145B22F1/17
Inventor 宋晓艳王杰侯超王海滨刘雪梅刘兴伟
Owner BEIJING UNIV OF TECH
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