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Preparation method of micro-nano double-scale composite porous material

A porous material, two-scale technology, applied in the field of porous metal materials, can solve the problems of long preparation period and complex driving process, and achieve the effect of overcoming extremely high brittleness, overcoming technical bottlenecks, and expanding specific surface area.

Inactive Publication Date: 2019-04-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combination of dealloying and other process methods is also commonly used to prepare micro-nano composite porous materials, but the current process for preparing precursors is complicated and the preparation period is long, which is only suitable for thin film materials

Method used

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  • Preparation method of micro-nano double-scale composite porous material
  • Preparation method of micro-nano double-scale composite porous material
  • Preparation method of micro-nano double-scale composite porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The preparation method of this micro-nano dual-scale composite porous material comprises the following steps:

[0021] (1) Put 400g of Mg and Zn mixture (metal Zn accounts for 70% of the mixture's mass) into the melting crucible in the high-pressure induction furnace, cover the furnace cover tightly, lock the furnace body, and evacuate to a vacuum degree of 10 -2 Pa;

[0022] (2) Fill in 0.1MPa hydrogen, heat the metal mixture in the melting crucible, melt the mixture to 20°C above the melting point, and then keep it warm for 30 minutes to fully dissolve the hydrogen in the alloy solution;

[0023] (3) Pour the metal melt into a crucible cooled by water at the bottom to obtain a directional arranged micron-scale regular through-hole material with a thickness of 90 mm and a porosity of the micron-level regular through-hole material of 34%;

[0024] (4) Use 1mol / L hydrochloric acid to dealloy the porous material until no obvious air bubbles are generated on...

Embodiment 2

[0025] Embodiment 2: The preparation method of this micro-nano dual-scale composite porous material comprises the following steps:

[0026] (1) Put 500g of Mg and Ag mixture (metal Ag accounts for 50% of the mass of the metal mixture) into the melting crucible in the high-pressure induction furnace, cover the furnace cover tightly, lock the furnace body, and evacuate until the vacuum degree is 10 -2 Pa;

[0027] (2) Fill in 0.5MPa hydrogen, heat the metal mixture in the melting crucible, melt the mixture to 30°C above the melting point, and keep it warm for 20 minutes to completely dissolve the hydrogen into the alloy solution;

[0028] (3) Pour the metal melt into a crucible cooled by water at the bottom to obtain a material with oriented micron-scale regular through holes; the macroscopic morphology of the longitudinal section of the Mg-Ag porous alloy is shown in figure 1 , the cross-sectional macroscopic topography is shown in figure 2 , and the partial enlargement of t...

Embodiment 3

[0030] Embodiment 3: The preparation method of this micro-nano dual-scale composite porous material comprises the following steps:

[0031] (1) Put 600g of Mg, Ag and Pd mixture (metal Ag accounts for 40% of the mass of the metal mixture) into the melting crucible in the high-pressure induction furnace, close the furnace cover, lock the furnace body, and evacuate until the vacuum degree is l0 -2 Pa;

[0032] (2) Fill in 1.5MPa hydrogen, heat the metal mixture in the melting crucible, melt the mixture to 20°C above the melting point, and then keep it warm for 30 minutes to fully dissolve the hydrogen in the alloy solution;

[0033] (3) Pour the metal melt into a crucible cooled by water at the bottom to obtain a directional arranged micron-scale regular through-hole material with a thickness of 110 mm and a porosity of micron-scale regular through-hole material of 47%;

[0034] (4) The obtained porous material was corroded by the electrochemical corrosion method, the electrol...

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Abstract

The invention discloses a preparation method of a micro-nano double-scale composite porous material. The preparation method comprises the following steps that a micron-scale regular through hole material with a pore structure controllable and oriented arranged is obtained through a solid-gas eutectic directional solidification process; then the porous material is taken as a precursor, the porous material of the precursor is subjected to dealloying treatment through chemical corrosion or electrochemical corrosion, so that nano pores are formed between the directional micro-pore walls, micro pores are communicated, and finally three-dimensional continuous micro-nano double-scale pores are obtained. The micro-nano double-scale composite porous material prepared by the method not only overcomes the defects that a traditional dealloying nano porous material is extremely small in size and extremely high in brittleness, but also maintains or expands the specific surface area of the porous material, the structural characteristics of which are undoubtedly beneficial to the transmission of fluid and macromolecules, so that the material is expected to be applied to the fields of catalysis, sensing, fuel cells, micro-flow control and the like, and has an important application prospect.

Description

technical field [0001] The invention discloses a preparation method of a micro-nano dual-scale composite porous material, which belongs to the field of porous metal materials. Background technique [0002] Micro-nano composite porous material is a biomimetic hierarchical porous structure composed of micropores and nanopores. As a kind of porous material, it is composed of solid phase skeleton and pores, and has low relative density, high specific surface area and good permeability. Features. As a metal porous material, it has excellent heat resistance and energy absorption capacity. As a nanoporous material, it has a high specific surface area and excellent mechanical, thermal, chemical and optical characteristics. The existence of micro-pores makes the micro-nano composite porous material have higher specific surface area and lower density. [0003] The preparation of micro-nano composite porous materials currently has a template method, such as the hydrogen template met...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C5/06C22C18/00C22C18/02C22C21/02C22C23/00C23F1/20C23F1/30C23F1/44C25F3/02C25F3/04C22C1/02
CPCC22C1/02C22C1/08C22C5/06C22C18/00C22C18/02C22C21/02C22C23/00C23F1/20C23F1/30C23F1/44C25F3/02C25F3/04C22C1/081
Inventor 李省霖李再久金青林段铁城
Owner KUNMING UNIV OF SCI & TECH
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