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Preparation method of porous metal oxide

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

Active Publication Date: 2019-07-05
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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  • Preparation method of porous metal oxide
  • Preparation method of porous metal oxide
  • Preparation method of porous metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This example 1 uses 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 as the ball mill 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 and the length is 2mm. The two are added to the ball milling equipment for high-energy ball milling. The speed is 250r / min, the milling time is 6h, and the ball-to-battery ratio is 6:1. The obtained mixed powder was cold pressed at room temperature, the pressing pressure was 50MPa, and the pressure holding time was 20s. The prepared carbon particles embedded in the copper compact were sintered under the protection of hydrogen atmosphere, and sintered at 900℃ for 1h. The heating rate and cooling rate of the furnace The sintered billet is annealed in the air to remove carbon and oxidation. The annealing temperature is 300°C and the holdin...

Embodiment 2

[0064] This example 2 uses 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 as raw materials for ball milling. The volume percentage of short carbon fibers is 25%, and the volume percentage of electrolytic nickel powder is 75%. The diameter is 6μm and the length is 2mm. The two are added to the ball milling equipment for high-energy ball milling, the speed is 280r / min, the milling time is 7h, and the ball-to-battery ratio is 6:1. The obtained mixed powder was sintered directly under the protection of hydrogen atmosphere, and sintered at 850℃ for 1h. The heating rate and cooling rate of the furnace were both 15℃ / min. Then the sintered compact was annealed in the air to remove carbon and oxidation, and the annealing temperature was 500℃. , The holding time is 30 minutes, the porosity of the porous nickel oxide is 22-30%, and the nickel oxide content is 90% of the total mass.

Embodiment 3

[0066] In this example 3, commercially available short carbon fibers and reduced iron powder with a particle size of 150 μm that were degummed at 800°C for 60 minutes were used as the ball mill raw materials. The volume percentage of short carbon fibers was 40%, and the volume percentage of reduced iron powder was 60%. The diameter is 6μm and the length is 2mm. The two are added to the ball milling equipment for high-energy ball milling. The speed is 300r / min, the milling time is 8h, and the ball-to-battery ratio is 6:1. The resulting mixed powder was sintered directly under vacuum and sintered at 980°C for 1 hour. The heating rate and cooling rate of the furnace were both 15°C / min. After that, the sintered compact was annealed in the air to remove carbon and oxidation. The annealing temperature was 500°C, and the temperature was kept warm. The time is 60 minutes, the porosity of the porous iron oxide is 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, and belongs to the crossing field of metal powder technology and metal material surface treatment. The preparation method comprises the following steps: firstly degumming short carbon fibers, then performing a suitable ball milling process on the degummed short carbon fibers and a metal powder to obtain a metal powder embeddedwith ultrafine carbon particles, performing sintering after press-forming in a protective atmosphere or vacuum, or directly performing loose sintering, finally performing short-time annealing treatment in oxygen-containing air to remove the carbon particles in the metal powder and partially oxidize the surface of metal particles to obtain the porous metal whose surface is partially oxidized. The porous metal oxide prepared by the method exhibits good oil storage, hydrogen storage, paraffin wax storage, lithium storage performances, and catalytic performance, and the porous metal oxide has simple preparation process and low cost.

Description

Technical field [0001] The invention relates to a method for preparing porous metal oxides, and belongs to the cross field of metal powder technology and metal material surface treatment. Background technique [0002] Porous metal material is a new type of metal material that contains a large number of connected or closed pores in the matrix. Compared with dense metal, porous metal has good compressibility, Poisson's ratio will change during deformation; compared with polymer foam, it has high rigidity and high use temperature, and it will not be affected by organic solvents. Dissolution; Compared with foam ceramics, it has good toughness, heat transfer performance and electrical conductivity. Because of its excellent performance, it has broad prospects in the automotive industry, aerospace, environmental protection, construction and other fields. [0003] Porous metal oxides play an important role in the field of catalysis. They are widely used as main catalysts, promoters and s...

Claims

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Application Information

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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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