Hierarchical pore structure nickel base alloy and its preparation method and application

A nickel-based alloy and multi-level pore technology, applied in the field of porous metal materials, can solve the problems of reduced electrode activity, limitation, and inability to discharge hydrogen in time, and achieve the effect of easy implementation and low cost

Active Publication Date: 2020-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common RaneyNi is used as a porous cathode material for electrolytic hydrogen production. It is prepared by dealloying, but its pore size is often less than 10nm, and the hydrogen gas generated during the hydrogen evolution process cannot be discharged in time, which reduces the electrode activity.
In addition, the size of porous alloys prepared by corrosion-smelting alloy precursors is small, which is limited in practical applications.

Method used

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  • Hierarchical pore structure nickel base alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Add 1.5g of gelatin and 50g of water into the mixing bottle. After the gelatin is completely dissolved, add 80g of nickel powder and 5g of aluminum powder into the mixing tank. After ball milling and mixing for 12 hours, a uniform water-based slurry containing nickel and aluminum is obtained; Inject the slurry into a mold with a copper bottom, put it on the copper substrate connected to the freezing device at the bottom, set the temperature at the lower end of the cold field to -20°C, and the temperature at the upper end to -20°C, and move the green body to a freeze dryer after it is completely frozen. ice crystals. After drying, transfer the green body to a hydrogen furnace for sintering, heat at a rate of 5 °C / min to 350 °C for 2 hours, and remove the added binder; further increase the rate of 5 °C / min to 1000 °C for 2 hours , and the samples were taken out after the furnace was cooled to room temperature. Soak the porous sample in 20% NaOH solution and corrode for 5 ...

Embodiment 2

[0039] Add 80g of deionized water, 4g of polyvinyl alcohol, and 0.24g of xanthan gum into the mixing bottle. After the organic matter is completely dissolved, add 80g of nickel powder, 50g of copper powder, and 10g of aluminum powder into the ball mill tank, and after ball milling for 12 hours, Obtain a uniform water-based nickel-copper-aluminum slurry; inject the slurry into a square plastic mold with copper at the bottom, put it on the copper substrate connected to the freezer at the lower end, set the temperature at the lower end of the cold field to -30°C, and the temperature at the upper end to 5°C. After the green body is completely frozen, it is moved to a freeze dryer to remove ice crystals. After drying, the green body was transferred to a hydrogen furnace for sintering, heated to 400°C at a rate of 5°C / min and kept for 2 hours to remove the added binder and thickener; further increased to 950°C at a rate of 10°C / min ℃ for 2 hours, and the samples were taken out after...

Embodiment 3

[0041] Add 100g of deionized water and 1.5g of gelatin into the mixing bottle, after the gelatin is completely dissolved, add 50g of NiO powder, 10g of MoO 3 Al powder, 10g of Al powder ball milled and mixed for 20 hours to obtain a uniform water-based slurry; inject the slurry into a square plastic mold with a copper bottom, put it on the copper substrate connected to the freezer at the bottom, and set the temperature at the bottom of the cold field to -50°C , the temperature at the upper end is -5°C. After the green body is completely frozen, move it to a freeze dryer to remove ice crystals. After drying, transfer the green body to a hydrogen furnace for sintering, heat at a rate of 2 °C / min to 350 °C for 2 hours, and remove the added binder; further increase the rate of 5 °C / min to 1050 °C for 2 hours , and the samples were taken out after the furnace was cooled to room temperature. Soak the porous sample in 20% NaOH solution and corrode for 5 hours to obtain a porous nick...

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Abstract

The invention belongs to the field of porous metal materials, and relates to a nickel-based alloy with a multi-stage pore structure as well as a preparation method and an application thereof. First-stage pores and second-stage pores are distributed in the nickel-based alloy, and the pore diameters of the first-stage pores are greater than or equal to 5[mu]m; and the pore diameters of the second-stage pores are less than or equal to 1[mu]m. The preparation method comprises the following steps: designing and preparing a slurry at first; then carrying out consolidation forming through a freezing casting technology, and then removing a liquid brought in the slurry to obtain a framework; under a protective atmosphere, carrying out sintering treatment on the framework to obtain a pre-finished product; controlling a sintering temperature to be 600-1300 DEG C; carrying out further pore forming treatment on the obtained pre-finished product; and obtaining the finished product which contains the first-stage pores and the second-stage pores. According to the nickel-based alloy with the multi-stage pore structure as well as the preparation method and the application thereof, fine adjustment and control can be carried out on the porosity, the pore diameter and the microstructure of the alloy by controlling a solid content and a freezing condition. The preparation method is simple in process, and capable of preparing a porous nickel-based alloy material containing different components, with high porosity and air permeability, and combining the two-stage pore structures of micro-nano pores.

Description

technical field [0001] The invention belongs to the field of porous metal materials, and relates to a nickel-based alloy with a multi-level pore structure and a preparation method and application thereof. Background technique [0002] At present, due to the excessive development and use of traditional fossil fuels such as coal, oil, and natural gas, global environmental pollution and energy crises have been triggered. Hydrogen is considered to be one of the ideal energy sources to replace fossil fuels and solve the energy crisis and environmental crisis. In recent years, the use of clean energy such as sunlight to electrolyze water to produce hydrogen (HER) is due to the high efficiency and controllability of the reaction, and the absence of CO 2 It has been extensively studied due to its advantages such as pollution and high purity of hydrogen, and it is expected to realize large-scale production. Because Ni has unpaired d-orbital electrons in the outer layer of the atom,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/22
CPCB22F3/1103B22F3/1121B22F3/1143B22F3/222
Inventor 刘新利祖利国张雷王德志周科朝
Owner CENT SOUTH UNIV
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