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Preparation method of high-density metal ceramic inert anode material for aluminum electrolysis

A technology of dense metal and inert anodes, which is applied in the field of preparation of high-density cermet inert anode materials for aluminum electrolysis, can solve problems such as unevenness, high porosity, metal phase overflow structure distribution, etc., to improve spreading and distribution, corrosion The effect of speed reduction and sufficient toughening effect

Pending Publication Date: 2021-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high porosity after sintering, metal phase overflow and uneven tissue distribution in the preparation process of the cermet inert anode in the prior art due to non-wetting of the interface between the metal and the ceramic, the purpose of the present invention is to provide a A method for preparing a high-density cermet inert anode material. The preparation method of the present invention is based on improving the wettability of the interface between metal and spinel oxide ceramics, reducing the sintering driving force of the material, and optimizing the distribution of metal phases, thereby significantly improving the Comprehensive performance

Method used

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  • Preparation method of high-density metal ceramic inert anode material for aluminum electrolysis
  • Preparation method of high-density metal ceramic inert anode material for aluminum electrolysis

Examples

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Embodiment 1

[0035] The raw material powder used in this embodiment includes NiFe with a weight fraction of 55 parts 2 O 4 -10NiAl 2 O 4 Ceramic composite powder, 38 parts Cu-20Ni-10Fe alloy powder, 4 parts Cu 2 O powder and 1 part Fe 2 O 3 Powder, 2.0 parts of Y 2 O 3 Firing aid ceramic powder. of which NiFe 2 O 4 and NiAl 2 O 4 The average particle sizes of the ceramic composite powders are 3.0 μm and 1.5 μm, respectively. 2 O powder and Fe 2 O 3 The average particle size of the powder is 0.5 μm and 1.5 μm, Y 2 O 3 The average particle size is 0.50 μm. The preparation method steps of this embodiment are as follows:

[0036] (1) Preparation of cermet slurry. Use deionized water as solvent, add raw material powder to obtain mixed slurry, and control the volume fraction of raw material powder in the mixed slurry to be 30%, and then add 2% polyvinyl alcohol that accounts for the weight of raw material powder and is dissolved in organic solvent as Binder; at 90r / min, ball m...

Embodiment 2

[0042] The raw material powder used in this embodiment includes NiFe with a weight fraction of 70 parts 2 O 4 -10Ni(Fe,Zn) 2 O 4 Ceramic composite powder, 22 parts Cu-10Ni-5Fe-5Cr alloy powder, 6 parts Cu 2 O powder and 2 parts NiO powder. of which NiFe 2 O 4 and Ni(Fe,Zn) 2 O 4 The average particle sizes of the ceramic composite powders are 2.5 μm and 0.8 μm, respectively. 2 O powder and Fe 2 O 3 The average particle size of the powders was 0.5 μm and 0.8 μm. The preparation method steps of this embodiment are as follows:

[0043] (1) Preparation of cermet slurry. Using deionized water as a solvent, adding raw material powder to obtain a mixed slurry, and controlling the volume fraction of the raw material powder in the mixed slurry to 35%. Then add 1.5% polyvinyl alcohol which accounts for the weight of raw powder and dissolve in organic solvent as a binder; at 80r / min, ball mill for 40h to obtain low-viscosity and uniform cermet slurry.

[0044] (2) Spray dryi...

Embodiment 3

[0049] The raw material powder used in this example includes NiFe with a weight fraction of 52 parts 2 O 4 -10NiAl 2 O 4 Ceramic composite powder, 38 parts Cu-20Ni-10Fe alloy powder, 4 parts Cu 2 O powder and 1 part Fe 2 O 3 Powder, 2.0 parts of Y 2 O 3 Firing aid ceramic powder, 2.0 parts of metal Mn powder, 1.0 part of metal Cr powder. of which NiFe 2 O 4 and NiAl 2 O 4 The average particle sizes of the ceramic composite powders are 3.0 μm and 1.5 μm, respectively. 2 O powder and Fe 2 O 3 The average particle size of the powder is 0.5 μm and 1.5 μm, Y 2 O 3 The average particle size of the Mn powder is 0.50 μm, and the average particle size of the metal Mn powder and Cr powder is 15 μm and 8 μm. The preparation method steps of this embodiment are as follows:

[0050] (5) Preparation of cermet slurry. Use deionized water as solvent, add raw material powder to obtain mixed slurry, and control the volume fraction of raw material powder in the mixed slurry to b...

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Abstract

The invention discloses a preparation method of a high-density metal ceramic inert anode material for aluminum electrolysis. The method comprises the following steps of, mixing oxide ceramic powder, metal powder, single-phase oxide ceramic powder and an additive to obtain raw material powder, adding the raw material powder into a solvent to obtain mixed slurry, adding an adhesive, carrying out ball milling and spray granulation, carrying out compression molding to obtain a metal ceramic green body, carrying out degreasing, and carrying out sintering under oxygen partial pressure to obtain the inert anode material. According to the preparation method, on one hand, a single-phase oxide is additionally added into raw materials, and on the other hand, sintering is carried out in a certain oxygen partial pressure negative pressure atmosphere, and the interface wettability of metal phases and spinel type oxide ceramics is effectively improved, so that the spreading and distribution of the metal phase among the ceramic phases are effectively improved, combination and growth of ceramic crystal grains are effectively inhibited, connected network-shaped distribution of the metal phases is achieved, and the metal ceramic inert anode material for aluminum electrolysis with the sintering relative density superior to 97% is obtained.

Description

technical field [0001] The invention belongs to the technical field of metal ceramic material preparation, in particular to a preparation method of a high-density metal ceramic inert anode material for aluminum electrolysis. Background technique [0002] Under the strategic background of "carbon neutrality", carbon-free aluminum electrolysis technology has become a must-have high-tech field for the sustainable development of the international aluminum electrolysis industry. Inert anode materials for aluminum electrolysis need to withstand high temperature cryolite molten salt erosion at 800-900 °C, and at the same time have high electrical conductivity and mechanical properties to meet long-term stable operation of aluminum electrolysis. Spinel-type oxides such as nickel ferrite have excellent corrosion resistance in cryolite, making them the preferred components of corrosion-resistant phases in inert anode materials for aluminum electrolysis. Cermet materials have excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/12C25C3/12B22F3/02B22F3/10B22F9/04
CPCC22C1/051C22C29/12C22C29/005C25C3/12B22F3/02B22F3/1007B22F3/1021B22F9/04B22F2201/03B22F2201/02B22F2998/00B22F2009/043
Inventor 周科朝张雷李志友熊慧文
Owner CENT SOUTH UNIV
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