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Preparing method for zirconium boride dispersion strengthening tungsten powder

A technology of dispersion strengthening and zirconium boride, which is applied in the field of metal tungsten powder preparation, can solve the problems of easy introduction of impurities, high energy consumption, and long cycle of dispersing tungsten powder, so as to increase the specific surface area, improve the degree of dispersion, and facilitate reduction and The effect of sintering densification

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For mechanical alloying, it needs to consume a lot of energy. During the mixing process, impurities are easily introduced due to the violent movement of the tank body and the grinding ball. Moreover, the preparation of dispersed tungsten powder by this method has a long cycle and poor economy.
The precipitation coating method can obtain doped tungsten powder with good dispersion and uniform quality, but because this method requires a large amount of acid and alkali to prepare and control the pH value of the solution for precipitation coating reaction, it is an environmentally unfriendly method

Method used

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  • Preparing method for zirconium boride dispersion strengthening tungsten powder
  • Preparing method for zirconium boride dispersion strengthening tungsten powder
  • Preparing method for zirconium boride dispersion strengthening tungsten powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of 0.2% ZrB2 tungsten

[0026] 1. Precursor solution preparation

[0027] 1) Take 100ml of deionized water, add 27.6g of AMT (corresponding to 20g of tungsten powder), 0.5g of PVP, stir evenly, and add dropwise ammonia until the pH is 11.

[0028] 2) Add the zirconium boride to be dispersed into the solution according to the mass percentage of 0.2%, and stir it evenly. Disperse in ultrasonic for 0.1h. A precursor dispersion is obtained.

[0029] 2. Precursor freezing and drying

[0030] The precursor dispersion liquid is sprayed into a container filled with liquid nitrogen in a spray manner using an atomized nozzle, collected and dried in a vacuum dryer to obtain a precursor powder.

[0031] 3. Calcination and reduction of precursor

[0032] The doped precursor was calcined in an argon atmosphere at 400° C. for 0.5 h. The PVP in the frozen precursor is decomposed and removed to obtain doped tungsten oxide, while avoiding the oxidation of zirconium boride. ...

Embodiment 2

[0033] Example 2: Preparation of 0.5% ZrB2 tungsten

[0034] 1. Precursor solution preparation

[0035] 1) Take 100ml of deionized water, add 27.6g of AMT (corresponding to 20g of tungsten powder), 1g of PVP, stir evenly, and add ammonia water dropwise to pH 12.

[0036] 2) Add the zirconium boride to be dispersed into the solution according to the mass percentage of 0.5%, and stir it evenly. Disperse in ultrasonic for 0.2h. A precursor dispersion is obtained.

[0037] 2. Precursor freezing and drying

[0038] The precursor dispersion liquid is sprayed into a container filled with liquid nitrogen in a spray manner using an atomized nozzle, collected and dried in a vacuum dryer to obtain a precursor powder.

[0039] 3. Calcination and reduction of precursor

[0040] The doped precursor was calcined in an argon atmosphere at 450° C. for 0.5 h. The PVP in the frozen precursor is decomposed and removed to obtain doped tungsten oxide, while avoiding the oxidation of zirconium boride. The d...

Embodiment 3

[0041] Example 3: Preparation of 1% ZrB2 tungsten

[0042] 1. Precursor solution preparation

[0043] 1) Take 100ml of deionized water, add 27.6g of AMT (corresponding to 20g of tungsten powder), 2g of PVP, stir evenly, and add ammonia water dropwise to pH 13.

[0044] 2) Add the zirconium boride to be dispersed into the solution according to the mass percentage of 1%, and stir it evenly. Disperse in ultrasound for 0.5h. A precursor dispersion is obtained.

[0045] 2. Precursor freezing and drying

[0046] The precursor dispersion liquid is sprayed into a container filled with liquid nitrogen in a spray manner using an atomized nozzle, collected and dried in a vacuum dryer to obtain a precursor powder.

[0047] 3. Calcination and reduction of precursor

[0048] The doped precursor was calcined in an argon atmosphere at 500° C. for 0.5 h. The PVP in the frozen precursor is decomposed and removed to obtain doped tungsten oxide while avoiding the oxidation of zirconium boride. The doped ...

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Abstract

The invention discloses a preparing method for zirconium boride dispersion strengthening tungsten powder, and relates to metal tungsten powder preparing. In the preparing method, deionized water, ammonium metatungstate and nano zirconium boride particles are prepared into a solution according to the needed proportion, after being subjected to uniform stirring and ultrasonic scattering, the solution is injected into liquid nitrogen, a frozen precursor is obtained, the frozen and dried precursor is roasted in the argon atmosphere with the temperature ranging from 400 DEG C to 600 DEG C, reduction of (500 DEG C-650 DEG C)*2h+ (700 DEG C-900 DEG C)*1 h is conducted in the hydrogen atmosphere, the temperature rise rate is (2-10) DEG C / min, the hydrogen flow is (0.1-1.0) L / min, and the dispersion strengthening tungsten powder is obtained. A tungsten base body obtained through the tungsten powder is sintered, particles are evenly dispersed in the interiors of crystal grains and grain boundaries, the size of the particles is the nano level, an obtained block is subjected to the mechanical test, and it is proved that the mechanical performance of the block is obviously improved. The dispersion strengthening tungsten prepared through the method has very high grain-boundary strength; and meanwhile, compared with traditional metal carbide and rare earth oxide dispersion particles, zirconium boride dispersion strengthening can reach a higher strengthening and toughening effect under the smaller adding amount.

Description

Technical field [0001] The invention belongs to the preparation of metal materials, and specifically relates to the preparation of metal tungsten powder. Background technique [0002] Tungsten is a metal material widely used in various industrial fields. It has the characteristics of high density, high melting point, high thermal conductivity, and low thermal expansion coefficient. It has unique applications in military industry, nuclear industry, and aerospace. Under these application conditions, tungsten needs to be subjected to coupled external field effects, such as high temperature, radiation and thermal shock. Under these conditions, tungsten materials are prone to failure, mainly due to brittle fracture under external force and re-heating under thermal effects. Crystal embrittlement. For tungsten whose crystal structure is body-centered cubic, its grain boundary strength is poor, which is the place where fracture easily occurs. Under the action of external load, intergra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 燕青芝王一甲
Owner UNIV OF SCI & TECH BEIJING
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