Preparation method and application of nano tungsten trioxide and nano tungsten powder

A technology of nano-tungsten trioxide and nano-tungsten powder, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, carbide, etc., to achieve the effect of improving nucleation rate, improving mixing uniformity and avoiding agglomeration

Active Publication Date: 2021-01-15
西安稀有金属材料研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low-cost, simple and efficient preparation of nano-tungsten oxide powder is still a problem, which has become a major bottleneck in the preparation of nano-tungsten powder by topological chemical transformation.

Method used

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  • Preparation method and application of nano tungsten trioxide and nano tungsten powder
  • Preparation method and application of nano tungsten trioxide and nano tungsten powder
  • Preparation method and application of nano tungsten trioxide and nano tungsten powder

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Experimental program
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Embodiment 1

[0030] This embodiment includes the following steps:

[0031] Step 1. Ultrasonically disperse 0.6g of carbon nanoparticles in 100mL of deionized water for 2h with the assistance of 0.4g of dispersant PVP, then add 20g of ammonium metatungstate with a mass purity of 99.5% and stir to obtain a mixed solution; The average particle size of the carbon nanoparticles is 20nm, the mass purity is 99%, and the carbon nanoparticles are an amorphous structure;

[0032]Step 2. The mixed solution obtained in step 1 is rotated to dryness at 90° C. at a speed of 600 rpm to obtain a composite powder;

[0033] Step 3: Decompose the composite powder obtained in step 2 at a rate of 80°C / min to 550°C in an air atmosphere and keep it warm for 2 hours to obtain nano-tungsten trioxide;

[0034] Step 4. Lay the nano-tungsten trioxide obtained in step 3 until the thickness of the material layer is 3mm. Under the hydrogen atmosphere, first raise the temperature to 600°C at a rate of 2.5°C / min and keep ...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] Step 1: Disperse 0.8g of carbon nanoparticles in 100mL of deionized water by ultrasonication for 1.5h with the assistance of 0.2g of dispersant PVP, then add 20g of ammonium metatungstate with a mass purity of 99.5% and stir to obtain a mixed solution; The average particle size of the carbon nanoparticles is 10nm, the mass purity is 99%, and the carbon nanoparticles have an amorphous structure;

[0043] Step 2. The mixed solution obtained in Step 1 is rotated to dryness at 100° C. at a speed of 200 rpm to obtain a composite powder;

[0044] Step 3: Decompose the composite powder obtained in step 2 at a rate of 100°C / min to 500°C in an air atmosphere and keep it warm for 5 hours to obtain nano-tungsten trioxide;

[0045] Step 4. Lay the nano-tungsten trioxide obtained in step 3 until the thickness of the material layer is 2mm. Under the hydrogen atmosphere, first raise the temperature to 560°C at a rate of 5°C / min a...

Embodiment 3

[0049] This embodiment includes the following steps:

[0050] Step 1. Disperse 0.5g of carbon nanoparticles in 100mL of deionized water with the aid of dispersant 0.6g of PVP and 0.6g of PEG1000 for 1h, then add 50g of ammonium metatungstate with a mass purity of 99.5% and mix well , to obtain a mixed solution; the average particle size of the carbon nanoparticles is 20nm, the mass purity is 99%, and the carbon nanoparticles are an amorphous structure;

[0051] Step 2. The mixed solution obtained in Step 1 is rotated to dryness at 95° C. at a speed of 250 rpm to obtain a composite powder;

[0052] Step 3: Decompose the composite powder obtained in step 2 by raising the temperature to 620°C at a rate of 10°C / min in an air atmosphere and keeping it warm for 2 hours to obtain nano-tungsten trioxide;

[0053] Step 4. Lay the nano-tungsten trioxide obtained in step 3 until the thickness of the material layer is 6mm. Under the hydrogen atmosphere, first raise the temperature to 620...

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Abstract

The invention discloses a preparation method of nano tungsten trioxide and nano tungsten powder. The preparation method comprises the steps of firstly, dispersing carbon nanoparticles, then adding ammonium metatungstate, and uniformly stirring the materials to obtain a mixed solution; secondly, drying the mixed solution to obtain combined powder; thirdly, heating and decomposing the combined powder to obtain the nano tungsten trioxide; and fourthly, carrying out segmented hydrogen reduction on the nano tungsten trioxide to obtain the nano tungsten powder. In addition, the invention discloses application of the nano tungsten powder to preparation of superfine nano tungsten carbide and fine-grain tungsten alloy. According to the preparation method, the carbon nanoparticles are used as a nucleating agent and a pore-forming agent for decomposition of the ammonium metatungstate, and therefore the nucleation and growth processes of the tungsten trioxide are effectively controlled, the nucleation rate of the tungsten trioxide is increased, the granularity of the tungsten trioxide is reduced, the nano tungsten powder is obtained through hydrogen reduction, and the problems of regulation and control over the nucleation, the granularity and the dispersity in the ammonium metatungstate decomposition process are solved; and an application method of the nano tungsten powder is simple, crystal grains of a tungsten material are prevented from being coarse, and the high-performance tungsten material can be obtained advantageously.

Description

technical field [0001] The invention belongs to the technical field of nano powder material preparation, and in particular relates to a preparation method and application of nano tungsten trioxide and nano tungsten powder. Background technique [0002] Metal tungsten has many excellent properties, such as: it has the highest melting point (3410°C) among metals, high high temperature strength, elastic modulus, electrical conductivity, thermal conductivity and corrosion resistance, small expansion coefficient and small vapor pressure And it has the characteristics of small evaporation rate and high sputtering threshold. With these excellent properties, tungsten and its alloy materials have very critical applications in many fields such as nuclear industry, military industry, electrical and electronic, chemical industry and metallurgical industry. Due to the high melting point of tungsten, sintering with tungsten powder as the main raw material is currently the main method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22C01G41/02B22F3/10C01B32/949B82Y40/00
CPCB22F3/1007B22F9/22B82Y40/00C01G41/02C01P2004/64C01B32/949
Inventor 孙国栋赵会宇张思雨刘璐胡小刚潘晓龙田丰张于胜
Owner 西安稀有金属材料研究院有限公司
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