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Powder metallurgy method for rapidly preparing ultra-fine grain pure tungsten material under multi-field coupling

A powder metallurgy and ultra-fine-grain technology, which is applied in the field of powder metallurgy for the rapid preparation of ultra-fine-grain pure tungsten materials, can solve the problems of complex process, expensive equipment, high energy consumption, etc., to reduce grain growth and inhibit grain The effect of growing and streamlining the sintering process

Active Publication Date: 2021-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem solved by the present invention is to provide a powder metallurgy method for rapidly preparing ultra-fine-grained pure tungsten materials under multi-field coupling for the shortcomings of the existing technology, such as huge energy consumption, complicated process, and expensive equipment.

Method used

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  • Powder metallurgy method for rapidly preparing ultra-fine grain pure tungsten material under multi-field coupling
  • Powder metallurgy method for rapidly preparing ultra-fine grain pure tungsten material under multi-field coupling
  • Powder metallurgy method for rapidly preparing ultra-fine grain pure tungsten material under multi-field coupling

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Embodiment 1

[0036] This embodiment is for rapid preparation of ultra-fine crystalline pure tungsten material under multi-field coupling. First, weigh 1.7g of tungsten powder with a particle size of less than 100nm, and directly loosely pack it in a powder metallurgy mold with an inner diameter of 6mm. The output voltage of the DC pulse power supply is 4.0V, the current is 1.4kA, and the frequency is 30kHz, and the power supply is turned on, and the power-on time is 20min. Figure 3a The pure tungsten material shown has a density of 96%, a grain size of 300-500nm, and a hardness of 667.2HV.

Embodiment 2

[0038] This embodiment is for rapid preparation of ultra-fine crystalline pure tungsten material under multi-field coupling. First, weigh 1.8g of tungsten powder with a particle size of less than 100nm, and directly loosely load it into a powder metallurgy mold with an inner diameter of 6mm. The output voltage of the DC pulse power supply is 3.0V, the current is 1.2kA, and the frequency is 30kHz, and the power supply is turned on, and the power-on time is 15min. Figure 3b The pure tungsten material shown has a density of 92%, a grain size of about 700μm, and a hardness of 631.2HV.

Embodiment 3

[0040] This embodiment is for rapid preparation of ultra-fine crystalline pure tungsten material under multi-field coupling. First, weigh 1.6g of tungsten powder with a particle size of less than 100nm, and directly loosely load it into a powder metallurgy mold with an inner diameter of 6mm. The output voltage of the DC pulse power supply is 4.0V, the current is 1.8kA, and the frequency is 10kHz, and the power supply is turned on, and the power-on time is 2min. Figure 3c The pure tungsten material shown has a density of 90%, a grain size of 2-3μm, and a hardness of 505.4HV.

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Abstract

The invention belongs to the field of metal material preparation, and particularly relates to a powder metallurgy method for rapidly preparing an ultra-fine grain pure tungsten material under multi-field coupling. The pure tungsten metal material with density close to the theoretical density can be successfully prepared within 1 min-20 min only by loosely filling a powder metallurgy die with metal tungsten powder and then directly carrying out multi-field coupling rapid sintering under the room temperature condition. The powder metallurgy method overcomes the defects of huge energy consumption, complex processes, expensive equipment and the like in a traditional method for preparing the pure tungsten material, and aims to provide a brand-new method which is simple to operate, efficient, low in consumption and processable for preparing the high-performance ultra-fine grain pure tungsten material and even various refractory metal materials.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a powder metallurgy method for rapidly preparing ultrafine-crystalline pure tungsten materials under multi-field coupling. [0002] technical background [0003] Energy resources are an important material basis for human survival and development. The development and effective utilization of energy resources represent the current level of production technology and living standards of human beings. For a long time, the continuous exploitation of coal and oil has made the depletion of fossil energy inevitable. In addition, the use of fossil fuels is accompanied by a large amount of pollution and greenhouse gas emissions, and the ecological problems brought about are becoming increasingly serious. Therefore, it is extremely urgent for all mankind to develop and utilize clean and renewable energy. [0004] Nuclear energy is considered to be one of the most promis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00B22F3/02B22F3/105
CPCB22F3/005B22F3/02B22F3/105Y02P10/25Y02E30/10
Inventor 张新房杜行健
Owner UNIV OF SCI & TECH BEIJING