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A kind of preparation method of porous metal powder

A technology of porous metal and metal powder, applied in the field of metal powder, can solve the problems of difficult control of the size and uniformity of metal porosity, small pore size, difficult to control oxygen diffusion and enrichment, etc., to achieve good market prospects, porosity Controllable, low-cost effects

Active Publication Date: 2021-08-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore size obtained by this method is too small (micron scale), and it needs to rely on the spontaneous diffusion and enrichment of oxygen on the surface and inside of the material, eventually forming a porous metal structure, and the diffusion and enrichment of oxygen is difficult to control, so The size and uniformity of porosity in metals is difficult to control
[0007] So far, there is no relevant record of preparing porous metal powder by high-energy ball milling combined with oxidation-reduction treatment.

Method used

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  • A kind of preparation method of porous metal powder
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Examples

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Embodiment 1

[0052] In this example 1, commercially available short carbon fibers that have been degummed at 700°C for 60 minutes and electrolytic copper powder with a particle size of 120 μm are used as ball milling raw materials. The volume percentage of short carbon fibers is 10%, and the volume percentage of electrolytic copper powder is 90%. The diameter is 6μm, the length is 2mm, the two are added to the ball milling equipment for high-energy ball milling, the speed is 250r / min, the ball milling time is 6h, the ball-to-material ratio is 6:1, and then annealed in air to remove carbon, the annealing temperature is 300 ℃, the holding time is 20 minutes, and then deoxidized in the hydrogen atmosphere, the annealing temperature is 350 ℃, the holding time is 30 minutes, and the porosity of the obtained porous copper powder reaches 9%.

Embodiment 2

[0054] In Example 2, commercially available short carbon fibers that have been degummed at 750°C for 60 minutes and electrolytic nickel powder with a particle size of 120 μm are used as ball milling raw materials. The volume percentage of short carbon fibers is 25%, and the volume percentage of electrolytic nickel powder is 75%. The diameter is 6μm, the length is 2mm, the two are added to the ball mill equipment for high-energy ball milling, the speed is 280r / min, the ball milling time is 7h, the ball-to-material ratio is 6:1, and then annealed in air to remove carbon, the annealing temperature is 300 ℃, the holding time is 30 minutes, and then annealed in the hydrogen atmosphere, the annealing temperature is 500 ℃, the holding time is 20 minutes, and the porosity of the obtained porous nickel powder reaches 22%.

Embodiment 3

[0056] In Example 3, commercially available short carbon fibers that have been degummed at 800°C for 60 minutes and reduced iron powder with a particle size of 150 μm are used as raw materials for ball milling. The volume percentage of short carbon fibers is 40%, and the volume percentage of reduced iron powder is 60%. The diameter is 6μm, the length is 2mm, the two are added to the ball milling equipment for high-energy ball milling, the speed is 300r / min, the ball milling time is 8h, the ball-to-material ratio is 6:1, and then annealed in air to remove carbon, the annealing temperature is 300 ℃, the holding time is 20 minutes, and then deoxidized in the hydrogen atmosphere, the annealing temperature is 500 ℃, the holding time is 30 minutes, and the obtained porous iron powder has a porosity of 38%.

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Abstract

The invention relates to a preparation method of porous metal powder, which belongs to the technical field of metal powder. The preparation method is as follows: degumming the short carbon fibers first, then passing the degummed short carbon fibers and metal powder through a proper ball milling process to obtain metal powder embedded with ultrafine carbon particles, and then performing annealing treatment in oxygen-containing air to remove carbon. The particles are finally annealed in a reducing atmosphere or a protective atmosphere or in a vacuum to obtain a high-purity porous metal powder with uniform and highly dispersed pores. In the porous metal powder prepared by the invention, the size of the metal particles is adjustable, the porosity is controllable, and the pore size is 1-3 μm. The prepared material exhibits good properties of oil storage, hydrogen storage, paraffin storage and lithium storage, and the preparation process is simple and the cost is low.

Description

technical field [0001] The invention relates to a preparation method of porous metal powder, which belongs to the technical field of metal powder. Background technique [0002] Porous metal material is a new type of metal material containing a large number of connected or closed pores in the matrix. Compared with dense metals, porous metals have good compressibility, and Poisson's ratio will change during deformation; compared with polymer foams, they have high stiffness and high service temperature, and will not be affected by organic solvents. Dissolution; Compared with foam ceramics, it has good toughness, heat transfer performance and electrical conductivity. Due to its excellent performance, it has broad prospects in the fields of automobile industry, aerospace, environmental protection, construction and so on. [0003] The preparation technology of porous metal materials mainly includes liquid metal solidification method, solid metal sintering method and metal deposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00
CPCB22F1/0007B22F9/04B22F2009/043B22F1/142
Inventor 肖鹏方华婵
Owner CENT SOUTH UNIV