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A kind of preparation method of porous metal oxide

A porous metal and oxide technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of difficult removal of templates, low production efficiency, and high production costs, and achieve good market prospects, excellent performance, and cost. low cost effect

Active Publication Date: 2021-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this preparation method are complex process, low production efficiency, high production cost, difficult removal of the template and easy to cause environmental pollution
So far, there is no relevant record of using high-energy ball milling combined with pressing-sintering-oxidation treatment to prepare porous metal with partially oxidized surface

Method used

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  • A kind of preparation method of porous metal oxide
  • A kind of preparation method of porous metal oxide
  • A kind of preparation method of porous metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 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 6 μm, and the length is 2 mm. The two are added to a ball mill for high-energy ball milling at a speed of 250 r / min, a ball milling time of 6 hours, and a ball-to-material ratio of 6:1. The obtained mixed powder was cold-pressed at room temperature, the pressing pressure was 50 MPa, and the holding time was 20s. The prepared carbon particles embedded in the copper compact were sintered under the protection of a hydrogen atmosphere, and sintered at 900 ° C for 1 hour. The heating rate and cooling rate of the furnace Both are at 15°C / min, and then the sintered body is annealed in air to remove carbon and oxidize. The annealing tempera...

Embodiment 2

[0064]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 6 μm, the length is 2 mm, and the two are added to a ball mill for high-energy ball milling at a speed of 280 r / min, a ball milling time of 7 hours, and a ball-to-material ratio of 6:1. The obtained mixed powder is directly sintered under the protection of a hydrogen atmosphere, and sintered at 850°C for 1 hour. The heating rate and cooling rate of the furnace are both 15°C / min, and then the sintered body is annealed in air to remove carbon and oxidize, and the annealing temperature is 500°C , the holding time is 30min, the porosity of the obtained porous nickel oxide reaches 22-30%, and the content of the nickel oxide is 90% of the total...

Embodiment 3

[0066] 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 6 μm, the length is 2 mm, and the two are added to a ball mill for high-energy ball milling at a speed of 300 r / min, a ball milling time of 8 hours, and a ball-to-material ratio of 6:1. The obtained mixed powder is directly sintered under vacuum, and sintered at 980°C for 1 hour. The heating rate and cooling rate of the furnace are both 15°C / min. The time is 60 minutes, and the porosity of the obtained porous iron oxide reaches 40-48%, and the iron oxide content is 85% of the total mass.

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Abstract

The invention relates to a preparation method of a porous metal oxide, which belongs to the intersection field of metal powder technology and metal material surface treatment. 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 sintering in a protective atmosphere or vacuum after pressing. Or direct loose-pack sintering, and finally perform short-term annealing in oxygen-containing air. While removing carbon particles in the metal powder, the surface of the metal particles is partially oxidized to obtain a porous metal with a partially oxidized surface. The porous metal oxide prepared by the invention exhibits good properties of oil storage, hydrogen storage, paraffin wax storage, lithium storage, and catalytic performance, and the preparation process is simple and the cost is low.

Description

technical field [0001] The invention relates to a preparation method of a porous metal oxide, which belongs to the intersection field of metal powder technology and metal material surface treatment. 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] Porous metal oxides play an important role in the field of catalysis, and they are widely used as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/622C04B35/626C04B35/65C04B35/01C04B35/45C04B35/26C04B35/46C04B35/04C04B35/495C04B35/10
CPCC04B35/01C04B35/04C04B35/10C04B35/26C04B35/45C04B35/46C04B35/495C04B35/622C04B35/6261C04B35/65C04B38/068C04B2235/40C04B2235/401C04B2235/402C04B2235/404C04B2235/405C04B2235/407C04B2235/408C04B2235/5248C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/663C04B38/0074
Inventor 方华婵肖鹏朱佳敏李金伟
Owner CENT SOUTH UNIV
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