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Preparation method of tungsten oxide nano powder and metal tungsten nano powder

A nano-powder, tungsten oxide technology, applied in tungsten oxide/tungsten hydroxide, nanotechnology and other directions, can solve the problems of high production cost, high energy consumption, low metal tungsten conversion rate, etc., and achieve small size and uniform dispersion. Effect

Inactive Publication Date: 2012-07-25
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because metal tungsten is difficult to evaporate, it needs to consume a lot of energy; the plasma method is a high-energy physical method, which not only consumes high energy, but also requires special equipment and high production costs; the reduction method of tungsten oxide powder is based on hydrazine tungstate Using ammonium paratungstate as a raw material, first synthesize tungsten oxide, and then obtain metal tungsten nanopowder through hydrogen reduction. This method can better control the grain size of nanopowder, but the conversion rate of metal tungsten is relatively low, and the cost is relatively low. higher

Method used

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  • Preparation method of tungsten oxide nano powder and metal tungsten nano powder
  • Preparation method of tungsten oxide nano powder and metal tungsten nano powder
  • Preparation method of tungsten oxide nano powder and metal tungsten nano powder

Examples

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Embodiment 1

[0013] Example 1: Dissolve 1 part of sodium tungstate and 50 parts of inducer in 4500 parts of water, heat the above solution, then keep it warm at 100°C, and treat it with 2000 parts of acidic solution with pH=4, followed by precipitation reaction. After the reaction, the precipitate is filtered, washed and dried to obtain tungsten oxide nanopowder. The obtained tungsten oxide nanopowder was heated in H 2 Calcining at 1200° C. for 20 minutes in the atmosphere to obtain metal tungsten nanopowder.

Embodiment 2

[0014] Example 2: Dissolve 10 parts of potassium tungstate and 1 part of inducer in 100 parts of water, heat the above solution, then keep it warm at 100°C, and treat it with 10 parts of acidic solution with pH=1, and then a precipitation reaction occurs. After the reaction, the precipitate is filtered, washed and dried to obtain tungsten oxide nanopowder. The obtained tungsten oxide nanopowder was calcined at 650° C. for 30 minutes in a CO atmosphere to obtain metal tungsten nanopowder.

Embodiment 3

[0015] Example 3: Dissolve 10 parts of ammonium tungstate and 1 part of inducer in 100 parts of water, heat the above solution, then keep it warm at 50°C, and treat it with 10 parts of acidic solution with pH=1, and then a precipitation reaction occurs. After the reaction was over, the precipitate was filtered and washed, and the filter cake was placed in N 2 The temperature was kept at 500° C. for 20 minutes to obtain tungsten oxide nanopowder. The obtained tungsten oxide nanopowder was heated in H 2 Calcining at 600° C. for 40 minutes in the atmosphere to obtain metal tungsten nanopowder.

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Abstract

The invention provides a preparation method of tungsten oxide nano powder and metal tungsten nano powder. The preparation method is characterized by comprising the following steps: tungstate, acid solution and water are adopted as raw materials, and under the induction and adjustment of an inducer (thioacetamide), tungstate and acid solution are subjected to precipitation reaction; after the generated precipitate is dried or calcined in the non-reducing atmosphere, the tungsten oxide nano powder with the average particle size about 80nm is obtained; if the generated precipitate is calcined in the reducing atmosphere, the metal tungsten nano powder with the average particle size about 40nm can be obtained. The preparation method provided by the invention is simple in process, rapid in reaction, low in synthesis cost and suitable for mass production.

Description

1. Technical field [0001] The invention relates to a method for preparing tungsten oxide nanopowder and metal tungsten nanopowder. 2. Background technology [0002] Metal tungsten has a high melting point, high hardness, wear resistance, good electrical and thermal conductivity, and is widely used in the fields of mining, metallurgy, electronics and machinery, and is also an important raw material for the preparation of cemented carbide materials. The rapid development of modern industry has put forward higher requirements for today's cemented carbide materials, and it is necessary to develop cemented carbide materials with high hardness, high strength and high wear resistance. In order to improve the comprehensive mechanical properties of traditional hard alloy materials, one of the effective ways is to reduce the grain size of raw metal tungsten powder, obtain high-performance ultra-fine powder or even nano-powder, and produce metal tungsten ultra-fine powder And nano-pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B22F9/22B82Y40/00
Inventor 胡坤宏黄飞蔡永愧
Owner HEFEI UNIV
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