Method for preparing nickel porous materials based on nickel oxalate and sodium chloride co-mixing reducing method

A technology of porous materials and sodium chloride is applied in the field of preparation of nickel porous materials, which can solve the problems of large difference between metal powder and pore-forming agent, and it is difficult to achieve sufficient and uniform mixing. The effect of agglomeration

Active Publication Date: 2019-07-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since the densities of the metal powder and the pore-forming agent generally differ greatly, it is difficult to achieve sufficient uniformity when mixing, and it is easy to obtain only a metal porous material with random pores in the end.
Patent literature (CN105154882 A) discloses "a method for preparing porous nickel". In this method, under an oxygen-isolated environment, an alkaline etching gas is introduced into the nickel source, and the gas reacts with the nickel source at high temperature, thereby producing Nickel porous material, but the porous structure is only formed on the surface of the nickel source

Method used

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  • Method for preparing nickel porous materials based on nickel oxalate and sodium chloride co-mixing reducing method
  • Method for preparing nickel porous materials based on nickel oxalate and sodium chloride co-mixing reducing method
  • Method for preparing nickel porous materials based on nickel oxalate and sodium chloride co-mixing reducing method

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Experimental program
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Effect test

Embodiment 1

[0031] According to the mass ratio, nickel oxalate powder (purity is 99%, particle size range is 80-120 mesh): sodium chloride powder (purity is 99%, particle size range is 80-120 mesh) = 7:1. Add the prepared nickel oxalate powder and sodium chloride powder into the planetary ball mill, use anhydrous alcohol as the ball mill dispersion medium, the ball-to-battery ratio is 4:1, the rotating speed is 100 rpm, and the ball milling time is 10 hours to obtain a uniform mixture . Dry the obtained mixture at a drying temperature of 50° C. and a time of 3 hours to obtain a fully dried mixture. In a hydrogen atmosphere, the obtained dry mixture is uniformly heated to 400° C. at a heating rate of 6° C. / min and kept for 60 minutes for reduction, and then cooled to obtain a mixed powder of nickel powder and sodium chloride powder. The obtained mixed powder is subjected to bidirectional compression at a unit pressure of 100 MPa, and the pressure is maintained for 1 second to obtain a comp...

Embodiment 2

[0034] According to the mass ratio, nickel oxalate powder (purity is 99%, particle size range is 120-200 mesh): sodium chloride powder (purity is 99%, particle size range is 120-200 mesh)=5.5:1. Add the prepared nickel oxalate powder and sodium chloride powder to the planetary ball mill, use anhydrous alcohol as the ball mill dispersion medium, the ball-to-battery ratio is 6:1, the rotating speed is 120 rpm, and the ball milling time is 12 hours to obtain a uniform mixture . Dry the obtained mixture at a drying temperature of 60°C and a time of 4 hours to obtain a fully dried mixture. In a hydrogen atmosphere, the obtained dry mixture is uniformly heated to 430°C at a temperature increase rate of 5°C / min and kept for 45 minutes for reduction, and then cooled to obtain a mixed powder of nickel powder and sodium chloride powder. The obtained mixed powder is subjected to bidirectional compression at a unit pressure of 150 MPa, and the pressure is maintained for 2 seconds to obtai...

Embodiment 3

[0037] According to the mass ratio, nickel oxalate powder (purity is 99%, particle size range is 200-300 mesh): sodium chloride powder (purity is 99%, particle size range is 200-300 mesh)=4:1, mix. Add the prepared nickel oxalate powder and sodium chloride powder into the planetary ball mill, use anhydrous alcohol as the ball mill dispersion medium, the ball-to-battery ratio is 9:1, the rotating speed is 150 rpm, and the ball milling time is 16 hours to obtain a uniform mixture . Dry the obtained mixture at a drying temperature of 70°C and a time of 4 hours to obtain a fully dried mixture. In a hydrogen atmosphere, the obtained dry mixture is uniformly heated to 450°C at a heating rate of 4°C / min and kept for 30 minutes for reduction, and then cooled to obtain a mixed powder of nickel powder and sodium chloride powder. The obtained mixed powder is subjected to bidirectional compression at a unit pressure of 200 MPa, and the pressure is maintained for 3 seconds to obtain a comp...

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Abstract

The invention discloses a method for preparing nickel porous materials based on a nickel oxalate and sodium chloride co-mixing reducing method, relates to a nickel porous material preparing method, and belongs to the technical field of metal porous material preparing. After nickel oxalate powder and sodium chloride powder are subjected to ball grinding and evenly mixed, reducing is conducted, thereducing temperature is 400-450 DEG C, and nickel powder and sodium chloride powder evenly-mixed powder is obtained; then, pressing is conducted at 100 MPa-200 MPa, sintering is conducted at 700-800 DEG C, and a sintered blank with certain strength is obtained; and finally, a water dissolving method is used for removing sodium chloride in the sintered blank, and the nickel porous materials are obtained. The preparing method has environment friendliness, and the prepared porous materials have the characteristics that porosity is high, hole distribution is uniform, and the hole diameter is controllable.

Description

Technical field [0001] The invention relates to a method for preparing a nickel porous material, and belongs to the technical field of metal porous material preparation. Background technique [0002] Porous metal materials are used in the fields of electronic devices, aerospace, biomedicine and environmental protection due to their excellent metal electrical and thermal conductivity, large specific surface area, high specific strength, good sound absorption and noise reduction capabilities, and excellent permeability. A class of functional materials that are widely used. In recent years, with the increasing demand for porous metal materials in many fields, higher requirements have been placed on the performance of porous metal materials. For example, in the application of loop heat pipes, the driving force of the flow circulation in the heat pipe mainly comes from the capillary pressure generated by the porous capillary core. Small pores create high capillary pressure, and larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F3/11
CPCB22F3/1134B22F9/22B22F2998/10B22F3/02
Inventor 刘如铁李浩陈洁王铸博廖宁刘红卫
Owner CENT SOUTH UNIV
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