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Nano tungsten powder doped with metal oxide nanoparticles and preparation method thereof

A nano-particle and nano-tungsten powder technology, applied in metal processing equipment, nanotechnology, transportation and packaging, etc., can solve the problems of difficult to meet commercial application, difficult process control, many influencing factors, etc., to improve the nucleation rate, The effect of improving uniformity and refining particle size

Active Publication Date: 2021-03-16
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the wet chemical method are that the process is complicated, the cost is high, there are many influencing factors and the process is difficult to control, and it is difficult to meet the needs of commercial applications.

Method used

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  • Nano tungsten powder doped with metal oxide nanoparticles and preparation method thereof
  • Nano tungsten powder doped with metal oxide nanoparticles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. The nanocrystalline tungsten trioxide with a mass purity of 99.9% is crushed and dispersed by ball milling with the assistance of ethanol and dispersant PEG-1000, and the pretreated tungsten source powder is obtained after drying; the average crystallinity of the nanocrystalline tungsten trioxide is The particles are smaller than 100nm, and the specific surface area is 7.5g / cm 3 , the addition of the ethanol is 60% of the quality of nanocrystalline tungsten trioxide, the addition of the dispersant PEG-1000 is 0.5% of the quality of nanocrystalline tungsten trioxide; , the time is 6h;

[0030] Step 2: ultrasonically atomize the aqueous solution of yttrium nitrate to obtain ultrafine / nano droplets, and then evenly spray the ultrafine / nano droplets on the pretreated tungsten source powder obtained in step 1, and obtain after drying Doped tungsten source powder; the concentration of the aqueous solution of ytt...

Embodiment 2

[0036] This embodiment includes the following steps:

[0037] Step 1. The nanocrystalline tungsten trioxide with a mass purity of 99.95% is crushed and dispersed by ball milling with the assistance of ethanol and dispersant PEG-1000, and the pretreated tungsten source powder is obtained after drying; the average crystallinity of the nanocrystalline tungsten trioxide is The particles are smaller than 80nm, and the specific surface area is 7.5g / cm 3 , the addition of the ethanol is 60% of the mass of nanocrystalline tungsten trioxide, the addition of the dispersant PEG-1000 is 0.3% of the mass of nanocrystalline tungsten trioxide; , the time is 2h;

[0038] Step 2: ultrasonically atomize the aqueous solution of yttrium nitrate to obtain ultrafine / nano droplets, and then evenly spray the ultrafine / nano droplets on the pretreated tungsten source powder obtained in step 1, and obtain after drying Doping tungsten source powder; the concentration of the aqueous solution of yttrium ...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] Step 1. The blue tungsten with a mass purity of 99.95% is ball milled and dispersed with the assistance of ethanol and dispersant PEG-1000, and the pretreated tungsten source powder is obtained after drying; the average grain size of the blue tungsten is less than 70nm, The specific surface area is 10g / cm 3 , the addition of ethanol is 70% of the mass of blue tungsten, the addition of PEG-1000 of the dispersant is 0.5% of the mass of blue tungsten; the speed of ball milling and dispersing is 250 rpm, and the time is 4h ;

[0044] Step 2: ultrasonically atomize the aqueous solution of yttrium nitrate to obtain ultrafine / nano droplets, and then evenly spray the ultrafine / nano droplets on the pretreated tungsten source powder obtained in step 1, and obtain after drying Doping tungsten source powder; the concentration of the aqueous solution of yttrium nitrate is 0.1g / mL, and the ultrafine / nano droplets are sprayed ac...

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Abstract

The invention discloses a method for preparing nano-tungsten powder doped with metal oxide nanoparticles. The method comprises: 1. dispersing tungsten trioxide or blue tungsten and drying to obtain pretreated tungsten source powder; 2. oxidizing the metal The ultrafine / nano-droplets obtained by ultrasonic atomization of the aqueous solution of the precursor salt of the substance are sprayed on the pretreated tungsten source powder to obtain the doped tungsten source powder; 3. The doped tungsten source powder is mixed with carbon nanoparticles and then heated and kept warm The pre-reduction powder is obtained; 4. The pre-reduction powder is reduced by hydrogen to obtain nano-tungsten powder doped with metal oxide nanoparticles; the invention also discloses the nano-tungsten powder doped with metal oxide nanoparticles prepared by the above method. In the present invention, carbon nanoparticles and doped metal oxide nanoparticles are used respectively to increase the nucleation rate of the corresponding reduction products, refine the particle size of the corresponding reduction products, and realize the control of the particle size of the metal oxide nanoparticles and tungsten powder , to obtain nano-tungsten powder uniformly doped with metal oxide nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of nano powder material preparation, and in particular relates to nano tungsten powder doped with metal oxide nanoparticles and a preparation method thereof. Background technique [0002] Metal tungsten has many excellent properties, such as: it has a high melting point (~3410°C), high high temperature strength, elastic modulus, electrical conductivity, thermal conductivity and corrosion resistance, small expansion coefficient, vapor pressure and Evaporation rate, and has a high sputtering threshold and low H / He retention, etc.; therefore, tungsten and its alloy materials are very critical in many fields such as nuclear industry, aerospace, military industry, electrical and electronic, chemical industry and metallurgical industry. Applications. With the rapid development of these industries, tungsten materials with ordinary structures have been difficult to meet the urgent needs of the superior comprehensiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F1/00B82Y40/00
CPCB22F9/22B82Y40/00B22F1/054
Inventor 孙国栋赵会宇刘璐胡小刚邱龙时张思雨潘晓龙田丰吴金平张于胜
Owner 西安稀有金属材料研究院有限公司
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