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A solid-phase combustion synthesis method for preparing porous metal monolithic profiles

A technology for porous metal and profiles, which is applied in the field of preparation of porous metal profiles, can solve the problems of easy foaming, difficulty in forming porous metal strips, rapid gas generation, etc. Effect

Active Publication Date: 2016-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the viscosity and fluidity of the colloidal precursor by the solution combustion method or the sol combustion method, the heating and ignition process is prone to foaming, and the gas is generated rapidly and in large quantities during the reaction, so that the prepared materials are mostly powdery and difficult to form. Ready-to-Use Monolithic Porous Metal Strip

Method used

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  • A solid-phase combustion synthesis method for preparing porous metal monolithic profiles
  • A solid-phase combustion synthesis method for preparing porous metal monolithic profiles

Examples

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Effect test

Embodiment 1

[0020] Porous nickel monolithic profiles were prepared as follows:

[0021] Step 1: Dissolve glycine and nickel nitrate in water at a molar ratio of 1.5:1, stir to form a uniform solution; evaporate water at 100°C to form a high-viscosity transparent colloidal precursor, and then place the colloidal precursor in vacuum, Dry at 200°C to obtain a molecular-level mixed solid complex precursor containing less crystal water.

[0022] Step 2: Grind the solid precursor obtained in the first step into a powder in a glove box filled with air dried at 100°C, and place the powder precursor in a cylindrical mold with d=16mm under a pressure of 10MPa Next, mechanically compact the powder into a cylindrical green body.

[0023] Step 3: After removing the mold, use an electric heating tungsten wire to partially ignite the green body prepared in the second step in the air, so that the solid precursor is self-propagating and fired into an integral nanoporous nickel integral profile in one ste...

Embodiment 2

[0026] After the third step in Example 1, the porous nickel monolithic profile is placed in a heat treatment device filled with a hydrogen atmosphere for reduction heat treatment to remove impurity elements such as C, N, and O in the nickel metal.

Embodiment 3

[0028] The preparation process is basically the same as in Example 1, but copper nitrate and citric acid are used as raw materials, and the molar ratio of citric acid to copper sulfate is 3:1 to prepare a porous copper integral profile. The microscopic morphology of the monolithic porous copper prepared by the above steps is as follows: figure 1 As shown, it is interlaced bands distributed with graded pores,

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Abstract

The invention provides a solid-phase combustion synthesis method for preparing an overall porous metal section. The method comprises the following steps of with metal salt and reducing organic matters servicing as raw materials, evenly mixing to form a water solution; evaporating a solvent to prepare sol; drying in vacuum to obtain a solid-state complex precursor; grinding complex powder into powder, and pressing into a green body with required shape and dimension; partially igniting redox reaction of the precursor, and carrying out self-propagating combustion on the green body to prepare overall porous metal. The method disclosed by the invention is simple in raw materials; the raw materials are mixed evenly by the solution; the overall porous material is synthesized by virtue of the advantages of stable solid-state combustion speed, high combustion temperature, and low and stable gas production rate.

Description

technical field [0001] The invention relates to a method for preparing a metal profile, in particular to a method for preparing a porous metal profile. Background technique [0002] Porous metals, such as foamed nickel, have a three-dimensional fully penetrating mesh structure, with a porosity of 90% to 98%, a density of only 2% to 5% of the theoretical density of nickel, a large specific surface area, and good physical and chemical properties of nickel. There are broad fields in the fields of chemical power sources, catalysis and catalyst carriers. At present, the mature industrial method for preparing continuous porous metal strips, such as the production of foamed nickel, needs to sputter Ni on the PU template first, then implement Ni electroplating, and finally remove the PU template by high-temperature heat treatment. The production equipment requires high requirements and a long cycle. High energy consumption and high cost. The high-temperature self-propagating combu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/23
Inventor 韦伟峰郭芹陈立宝
Owner CENT SOUTH UNIV
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