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Method for preparing porous tungsten material based on W-Fe-C system corrosion method

A technology of porous tungsten and etching method, applied in the field of porous metal materials, can solve the problems of uncontrollable pore size, low porosity, uncontrollable pore size, etc., to promote interaction and mass transfer, controllable porosity, and improve sintering. effect of effect

Active Publication Date: 2020-04-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN103774184A discloses a method for preparing porous tungsten by electrolysis. The method utilizes the characteristic that tungsten is electrolyzed by electrochemical action in molten salt solution, and uses AC power and DC power to electrolyze tungsten metal in NaOH solution containing additives. Porous tungsten, although the porous tungsten prepared by this method has a uniform pore size distribution, the pore size is uncontrollable and the porosity is low
The currently reported methods for preparing porous tungsten cannot control the pore size in a large range of porosity, and obtain pores with regular morphology

Method used

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  • Method for preparing porous tungsten material based on W-Fe-C system corrosion method
  • Method for preparing porous tungsten material based on W-Fe-C system corrosion method
  • Method for preparing porous tungsten material based on W-Fe-C system corrosion method

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Embodiment 1

[0033] This embodiment provides a method for preparing a porous tungsten material, comprising the following steps:

[0034] Weigh tungsten powder (purity 99.99%, average particle size 1μm) and iron powder (purity 99.99%, average particle size 10μm) in a molar ratio of 20:80, then add 0.01% of the total mass of tungsten powder and iron powder Nano C powder (purity is 99.99%, average particle size is 30nm), the mixed powder is milled on a light low-energy ball mill at 150 rpm for 12 hours, so that the composite powder is mixed evenly; the composite powder is sintered in a discharge plasma sintering furnace Low-temperature sintering, vacuuming in the furnace, sintering temperature of 800°C, holding time of 10min, sintering pressure of 20MPa to obtain a tungsten-iron block; the preparation concentration of 5wt% H 2 SO 4 solution, put the clean ferrotungsten block into excess H 2 SO 4 solution, put the container in a water bath, heat it to 50°C and keep it warm, observe the bubb...

Embodiment 2

[0036] This embodiment provides a method for preparing micron-scale porous tungsten, including the following steps:

[0037] Weigh tungsten powder (purity 99.99%, average particle size 3 μm) and iron powder (purity 99.99%, average particle size 5 μm) in a molar ratio of 60:40, then add 0.05% of the total mass of tungsten powder and iron powder Nano C powder (purity is 99.99%, average particle size is 50nm), the mixed powder is ball milled on a light low-energy ball mill at a speed of 200 rpm for 12 hours, so that the composite powder is mixed evenly; the composite powder is in a discharge plasma sintering furnace Carry out low-temperature sintering, vacuumize the furnace, the sintering temperature is 900°C, the holding time is 10min, the sintering pressure is 20MPa, and the tungsten-iron block is obtained; the concentration of 5wt% H 2 SO 4 solution, put the clean ferrotungsten block into excess H 2 SO 4 solution, and the container was placed in a water bath and heated to 5...

Embodiment 3

[0039] This embodiment provides a method for preparing micron-scale porous tungsten, including the following steps:

[0040] Tungsten powder (purity is 99.99%, 2 μm) and iron powder (purity is 99.99%, 7 μm) are weighed in molar ratio as 40:60, then add 0.1% nano C powder (purity is 99.99%, and the average particle size is 40nm), the mixed powder is ball milled on a light low-energy ball mill at 200 rpm for 18 hours, so that the composite powder is mixed evenly; the composite powder is sintered at a low temperature in a discharge plasma sintering furnace, and pumped Vacuum, the sintering temperature is 900°C, the holding time is 10min, and the sintering pressure is 20MPa to obtain a tungsten-iron block; the concentration of 5wt% H 2 SO 4 solution, put the clean ferrotungsten block into excess H 2 SO 4 solution, and the container was placed in a water bath and heated to 50°C to keep it warm. Record time. Observe the reaction bubbles of active metal iron and sulfuric acid so...

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Abstract

The invention relates to a method for preparing a porous tungsten material based on a W-Fe-C system corrosion method. The method comprises the following specific steps that 1), a compound block body is formed by low-temperature sintering, wherein tungsten powder, iron powder and carbon powder are uniformly ball-milled, mixed powder is obtained, the mixed powder is loaded into a graphite grinding tool, and a tungsten iron block body is obtained by discharging plasma sintering; 2), iron in a base material is corroded by a chemical etching method, wherein the tungsten iron block body is placed inan excess dilute sulfuric acid solution, and the dilute sulfuric acid solution is heated to 40-80 DEG C, and a porous tungsten green body with the micron pore diameter is obtained; and 3), porous tungsten is prepared by high-temperature sintering, wherein the porous tungsten green body obtained in the step 3) is subjected to vacuum pressure-free sintering, and the porous tungsten material is obtained. The porous tungsten material is uniform in pore distribution, consistent in structure and free of obvious defects, the porosity is 25.8-78%, the pore size is 1-10 micrometers, and the application is wide.

Description

technical field [0001] The invention belongs to the technical field of porous metal materials, and in particular relates to a method for preparing porous tungsten materials based on a W-Fe-C system corrosion method. Background technique [0002] Porous metal has the characteristics of low relative density, high specific strength, large specific surface area, strong permeability, and good energy absorption. It is a multifunctional material integrating mechanical, thermal, acoustic, and electrical properties. [0003] Porous tungsten has excellent thermal, electrical and mechanical properties, and is widely used in the fields of contemporary communication technology, electronic computers, aerospace development, medicine and health, photosensitive materials, optoelectronic materials, energy materials and catalyst materials, especially for high current Density porous cathodes, emitters charged into electron emission materials in ion engines, vaporizers for mercury gas-liquid sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/08B22F3/105B22F3/11
CPCB22F3/105B22F3/114B22F2003/1051C22C1/08C22C27/04
Inventor 张建葛帅孙一罗国强沈强赵奥奥张联盟
Owner WUHAN UNIV OF TECH
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