Tungsten-doped alloy powder and preparing method thereof

A tungsten alloy and powder technology, applied in the field of doped tungsten alloy powder and its preparation, can solve the problem of difficult to meet high-performance tungsten alloy, and achieve the effect of uniform distribution of components, uniform distribution and small particle size

Active Publication Date: 2017-06-13
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But using this method to prepare doped with Y 2 o 3 , ZrO 2 Composite tungsten powder is difficult to meet the demand for high-performance tungsten alloy production

Method used

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  • Tungsten-doped alloy powder and preparing method thereof
  • Tungsten-doped alloy powder and preparing method thereof
  • Tungsten-doped alloy powder and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the doped tungsten alloy powder of the present embodiment comprises the following steps:

[0037] 1) Prepare suspension A and suspension B:

[0038] A) Take 61.0g of ammonium paratungstate, mix 13ml of concentrated nitric acid and ammonium paratungstate in beaker 1, add distilled water to adjust the pH to 1, pour it into autoclave 1 after stirring, put it in a vacuum drying oven and react at 180°C for 15h, After the reaction, pour out the supernatant in the autoclave 1, then pour it into the beaker 2, add distilled water to wash the precipitate 5 times, then add distilled water, and stir to obtain a suspension A;

[0039]B) Get 4.10g of zirconium nitrate and dissolve it in distilled water. According to the ratio of ammonia and zirconium nitrate molar ratio in ammonia water to 4:1, drip ammonia water into the zirconium nitrate solution to form a precipitate to obtain suspension B1; take 1.09 g of yttrium nitrate g is dissolved in distilled wate...

Embodiment 2

[0044] The preparation method of the doped tungsten alloy powder of the present embodiment comprises the following steps:

[0045] 1) Prepare suspension A and suspension B:

[0046] A) Take 398.56g of ammonium paratungstate, mix 85ml of concentrated nitric acid and ammonium paratungstate in beaker 1, add distilled water to adjust the pH to 1.2, pour it into autoclave 1 after stirring, put it in a vacuum drying oven and react at 180°C for 17h, After the reaction, pour out the supernatant in the autoclave 1, then pour it into the beaker 2, add distilled water to wash the precipitate 8 times, then add distilled water, and stir to obtain a suspension A;

[0047] B) Dissolve 14.19 g of zirconium nitrate in distilled water. According to the ratio of ammonia and zirconium nitrate molar ratio of 4:1 in the ammonia water, drip ammonia water into the zirconium nitrate solution to form a precipitate to obtain suspension B1; take 5.05 g of yttrium nitrate g is dissolved in distilled wate...

Embodiment 3

[0052] The preparation method of the doped tungsten alloy powder of the present embodiment comprises the following steps:

[0053] 1) Prepare suspension A and suspension B:

[0054] A) Take 238.38g of ammonium paratungstate, add 50ml of concentrated nitric acid into distilled water to make a nitric acid solution with a pH of 1.1, mix it with ammonium paratungstate in beaker 1, pour it into autoclave 1 after stirring, put it in a vacuum drying oven at 180°C The reaction was carried out for 20 hours. After the reaction, the supernatant in the autoclave 1 was poured out, then poured into the beaker 2, and the precipitate was washed with distilled water for 6 times, then added with distilled water, and stirred to obtain a suspension A;

[0055] B) Get 21.89g of zirconium nitrate and dissolve it in distilled water. According to the ratio of ammonia and zirconium nitrate molar ratio in ammonia water to 4:1, drip ammonia water into the zirconium nitrate solution to form a precipitate...

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Abstract

The invention relates to tungsten-doped alloy powder and a preparing method thereof and belongs to the field of tungsten-based alloy materials. The preparing method of the tungsten-doped alloy powder comprises the following steps: 1, preparing a suspension A and a suspension B, wherein the suspension A is prepared by carrying out hydrothermal reaction on ammonium paratungstate under the condition that the pH is 1-1.2 and carrying out washing and sedimentation, and the suspension B is prepared by separately adding ammonium hydroxide into a zirconium nitrate solution and a yttrium nitrate solution and carrying out mixing, hydrothermal reaction, washing and sedimentation; 2, uniformly mixing the suspension A and the suspension B which are obtained in the step 1, and then, filtering and drying sediments so as to obtain precursor powder; and 3, forging the precursor powder obtained in the step 2 and carrying out reduction at a hydrogen atmosphere so as to obtain the tungsten-doped alloy powder. The tungsten-doped alloy powder which is obtained by adopting the preparing method has the advantages that the granularity of all components is small, the sizes of particles are more uniform, and the distribution of the components is more uniform.

Description

technical field [0001] The invention relates to the field of tungsten-based alloy materials, in particular to a doped tungsten alloy powder and a preparation method thereof. Background technique [0002] As a rare refractory metal, tungsten has the advantages of high melting point, good electrical and thermal conductivity, low sputtering corrosion rate, small thermal expansion coefficient, low vapor pressure and excellent high temperature strength at high temperature, etc. It is widely used in aerospace, casting, weapons In other departments, it is used to make tools such as rocket nozzles, die-casting molds, armor-piercing cores, contacts, electrodes and heat shields. However, tungsten also has defects such as low-temperature brittleness, high ductile-brittle transition temperature, low recrystallization temperature, and radiation hardening and embrittlement. With the development and progress of science, the requirements for the performance of tungsten alloys are getting h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
CPCB22F9/26
Inventor 徐流杰李洲魏世忠刘伟李秀青潘昆明周玉成李继文
Owner HENAN UNIV OF SCI & TECH
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