Preparation method aluminum oxide coating tungsten powder

A technology of alumina and coating powder, which is applied in the field of preparation of composite nano-powder

Active Publication Date: 2016-03-16
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem in the prior art that it is difficult to form nano-scale aluminum oxide uniformly coated tungsten powder composite materials in the prior art, the present invention provides a preparation method of alumina coated tungsten powder, through which the obtained The powder has good dispersibility and can refine the crystal grains of tungsten

Method used

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  • Preparation method aluminum oxide coating tungsten powder
  • Preparation method aluminum oxide coating tungsten powder
  • Preparation method aluminum oxide coating tungsten powder

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) According to the mass fraction of alumina hydrate in the target coating powder is 0.5%, weigh 30.3g (NH 4 ) 6 h 2 W 12 o 40 , 0.75gAl(NO 3 ) 3 9H 2 O, 40ml dilute HNO 3 , 0.18gCO(NH 2 ) 2 , 40ml of distilled water. Will (NH 4 ) 6 h 2 W 12 o 40 and HNO 3 Put into a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time is 10h, and the reaction produces WO 3 and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0045] (2) Al(NO 3 ) 3 , CO(NH 2 ) 2 Put it into another hydrothermal kettle with distilled water, the temperature of hydrothermal reaction is 180°C, the time is 10h, and the reaction generates AlO(OH) and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0046] (3) will WO 3 and NH 4 NO 3 A mixed solution of AlO(OH) and NH 4 NO 3 Pour the mixed solution into a pure beaker and mix and stir in turn. The stirring speed is...

Embodiment 2

[0052] (1) According to the mass fraction of alumina hydrate in the target coating powder is 1.0%, weigh 30.3g (NH 4 ) 6 h 2 W 12 o 40 , 1.65gAl(NO 3 ) 3 9H 2 O, 40mlHNO 3 , 0.4gCO(NH 2 ) 2 , distilled water 40ml; will (NH 4 ) 6 h 2 W 12 o 40 and HNO 3 Put into a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time is 10h, and the reaction produces WO 3 and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0053] (2) Al(NO 3 ) 3 , CO(NH 2 ) 2 Put it into another hydrothermal kettle with distilled water for hydrothermal reaction. The temperature of the hydrothermal reaction is 180°C and the time is 10h. The reaction generates AlO(OH) and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0054] (3) will WO 3 and NH 4 NO 3 A mixed solution of AlO(OH) and NH 4 NO 3Pour the mixed solution into a pure beaker and mix and stir in turn. The st...

Embodiment 3

[0060] (1) According to the mass fraction of alumina hydrate in the target coating powder is 3.0%, weigh 30.3g (NH 4 ) 6 h 2 W 12 o 40 , 5.38gAl(NO 3 ) 3 9H 2 O, 40mlHNO 3 , 0.54gCO(NH 2 ) 2 , will (NH 4 ) 6 h 2 W 12 o 40 and HNO 3 Put into a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time is 10h, and the reaction produces WO 3 and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0061] (2) Al(NO 3 ) 3 and CO(NH 2 ) 2 Put it into another hydrothermal kettle with distilled water for hydrothermal reaction. The temperature of the hydrothermal reaction is 180°C and the time is 10h. The reaction generates AlO(OH) and NH 4 NO 3 Mix the solution, and cool the mixed solution to room temperature;

[0062] (3) will WO 3 and NH 4 NO 3 A mixed solution of AlO(OH) and NH 4 NO 3 Pour the mixed solution into a pure beaker and mix and stir in turn. The stirring speed is 20...

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Abstract

The invention discloses a preparation method aluminum oxide coating tungsten powder. Firstly, coating powder formed by coating AlO(OH) on a WO3 surface layer is prepared; then, the coating powder is calcined by 6-12 hours under the condition of 300-500 DEG C; and finally, the coating powder is fully reduced in a hydrogen atmosphere to obtain the aluminum oxide coating tungsten powder. The preparation method prepares an aluminum oxide uniform coating tungsten powder composite material through calcining and secondarily reducing hydrated aluminum oxide coating tungsten oxide powder; the particle diameter distribution of the powder can be controlled through controlling the content of aluminum oxide in the composite material, so that the powder dispersibility is better; the powder finally formed through the calcining and reducing processes has no other impurities; a layer of film is formed on the tungsten particle surface through the generation of aluminum oxide in the reducing process; the film stops the deposition of secondarily reduced tungsten on the surface thereof so as to inhibit the growth of tungsten particles; and the aluminum oxide is mingled to limit the polymerization of tungsten atoms to inhibit the growth of elementary tungsten particles so as to achieve a grain refining effect.

Description

technical field [0001] The invention relates to the field of preparation of composite nanometer powder, in particular to a preparation method of alumina-coated tungsten powder. Background technique [0002] High strength, high toughness, high hardness, light weight, high temperature resistance, corrosion resistance and wear resistance are the main development directions of high performance structural materials. With its excellent high temperature resistance, high strength and hardness, tungsten is an irreplaceable key material in many fields, especially in the fields of national defense, aerospace and aerospace. Compared with pure tungsten, the formed alumina-coated tungsten and tungsten alloy can greatly increase the strength of tungsten, refine the grain, reduce the particle size, and increase the mechanical properties of the material such as toughness and tensile strength. An important step in the preparation of alumina-coated tungsten powder is to generate a precursor o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/02
CPCB22F9/22B22F1/16
Inventor 潘昆明赵阳魏世忠徐流杰单康宁王晓东李洲柳海斌朱甜媛李亚星王飞鸿
Owner HENAN UNIV OF SCI & TECH
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