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Preparation method of vanadium diboride powder

A vanadium diboride and powder technology, which is applied in the field of vanadium diboride powder preparation, can solve the problems of special equipment required for the production process, large particle size of the synthesized powder, not suitable for mass production, etc., and achieve low price , low synthesis temperature and low cost

Active Publication Date: 2014-08-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] current VB 2 The preparation methods of powder mainly include the following types, including (1) direct heating or mechanical alloying of metal element V and element B to synthesize. This method has simple process and low temperature, but the raw materials are expensive, and the particle size of the synthesized powder is large and uniform. (2) Using a reducing agent to reduce V 2 o 5 , the particle size of the powder prepared by this method is uniform, but the synthesis temperature is high (>1300°C), and the raw material V used 2 o 5 It is a highly toxic substance; (3) VCl is used 4 , NaBH 4 and Mg as raw materials, synthesize VB by solid phase reaction in the reactor 2 , the synthesis temperature of this method is low (650°C), and the particle size of the obtained powder can reach nanometer level, but the raw materials are expensive, and the production process requires special equipment, which is not suitable for mass production

Method used

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  • Preparation method of vanadium diboride powder
  • Preparation method of vanadium diboride powder

Examples

Experimental program
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Embodiment 1

[0018] Will NH 4 VO 3 Mix with elemental B powder at a molar ratio of 3:11 to obtain powder 1; mix NaCl and KCl at a molar ratio of 1:1 to obtain powder 2; mix powder 1 with powder 2 Powder 3 was obtained after dry grinding and mixing in a ball mill at a mass ratio of 1:10 for 1 hour; the powder 3 was placed in an alumina crucible, heated to 900°C under the protection of flowing Ar gas and kept for 1 hour, and then naturally cooled to room temperature Finally, powder 4 was obtained; the powder 4 was immersed in distilled water at 60°C and kept stirring for 0.5h, and the precipitate was separated by vacuum filtration; the precipitate was washed twice with distilled water at 60°C, washed once with ethanol, and dried to obtain VB 2 Powder.

[0019] figure 1 Nano VB prepared for this embodiment 2 The XRD pattern of powder, this pattern shows, the prepared VB 2 The powder is a pure phase without other impurity phases.

[0020] figure 2 VB prepared in this embodiment 2 The ...

Embodiment 2

[0022] Will NH 4 VO 3 Proportion with elemental B powder at a molar ratio of 3:11 to obtain powder 1; powder 1 and NaCl were dry-milled and mixed in a ball mill for 1 hour at a mass ratio of 1:10 to obtain powder 2; powder The body 2 was placed in an alumina crucible, heated to 800°C under the protection of flowing Ar gas and kept for 4 hours, and then the powder 3 was obtained after natural cooling to room temperature; the powder 3 was immersed in 70°C distilled water and kept stirring for 0.5h, and then vacuum The precipitate was separated by suction filtration; the precipitate was washed twice with 80°C distilled water and once with ethanol, and dried to obtain VB 2 Powder.

Embodiment 3

[0024] Will NH 4 VO 3 Proportion with elemental B powder in a molar ratio of 3:11 to obtain powder 1; powder 1 and KCl were dry-milled and mixed in a ball mill for 1 hour at a mass ratio of 1:5 to obtain powder 2; powder The body 2 was placed in an alumina crucible, heated to 1100°C under the protection of flowing Ar gas and kept for 0.5h, and then naturally cooled to room temperature to obtain the powder 3; the powder 3 was immersed in 80°C distilled water and kept stirring for 1.5h, The precipitate was separated by vacuum filtration; the precipitate was washed twice with 80°C distilled water, washed once with ethanol, and dried to obtain VB 2 Powder.

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Abstract

The invention discloses a preparation method of vanadium diboride powder, belonging to the technical field of ceramic powder preparation. The preparation method is characterized by uniformly mixing ammonium metavanadate, boron powder and a certain amount of molten salt and then carrying out heat treatment on the mixture at 800-1100 DEG C for 0.5-4 hours under the protection of an inert gas, thus obtaining the vanadium diboride powder, wherein the mole ratio of ammonium metavanadate to boron powder is 3:11; the byproducts generated after reaction, namely diboron trioxide and molten salt, can be removed by soaking the byproducts in hot water to dissolve the byproducts. The preparation method has the technical effects that the vanadium source adopted in the method is non-toxic and harmless; the preparation method is simple in production process and is suitable for volume production; the molten salt environment introduced in the method increases the diffusion velocity of solid phase matters, so that the synthesis temperature is low and the synthesis cycle is short; and the synthesized powder has the characteristics of high purity, small grain size and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic powder preparation, in particular to a vanadium diboride (VB 2 ) powder preparation method, which can be used to prepare ultra-high temperature ceramics, wear-resistant materials and alkaline battery electrode materials. Background technique [0002] VB 2 It has the characteristics of high melting point, high hardness, good electrical and thermal conductivity, and resistance to molten metal erosion. It can be used to make ultra-high temperature structural materials, and has important applications in extreme environments such as ultra-high temperature and metal smelting. In addition, VB 2 As an alkaline battery electrode material, it has a large discharge capacity and is a new type of energy material. [0003] current VB 2 The preparation methods of powder mainly include the following types, including (1) direct heating or mechanical alloying of metal element V and element B to synthesize. This...

Claims

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Application Information

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IPC IPC(8): C01B35/04
Inventor 冉松林魏雅男孙慧峰汪德文周黎明
Owner ANHUI UNIVERSITY OF TECHNOLOGY