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Metal ceramic material for aluminum electrolysis inert anode and preparation method thereof

A cermet and inert anode technology, applied in the field of cermet materials for aluminum electrolysis inert anodes, can solve the problems of affecting the service life of electrodes, difficulty in further improving the density and conductivity of cermets, and limiting the content of alloy components in cermets, etc. To achieve the effect of improving corrosion resistance, high density, and improving sintering activity

Pending Publication Date: 2021-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the metal phases in aluminum electrolytic inert anode cermet materials are mostly Cu-Ni and Fe-Ni-based alloys, but most of them will preferentially corrode Fe and Cu during use, which will affect the service life of the electrode and limit the metal phase. The content of alloy components in ceramics makes it difficult to further improve the density and conductivity of cermets

Method used

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  • Metal ceramic material for aluminum electrolysis inert anode and preparation method thereof
  • Metal ceramic material for aluminum electrolysis inert anode and preparation method thereof
  • Metal ceramic material for aluminum electrolysis inert anode and preparation method thereof

Examples

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Embodiment 1

[0073] A cermet material of an aluminum electrolytic inert anode is formed by pressing a steel mold. Calculated by mass fraction, the alloy phase content is 40%, and the elements and contents contained in the alloy phase are: 40% Fe, 5% Cu, 45% Ni, 8% Co, 2% Cr, and the alloy phase passes through the metal elemental powder Obtained after mixing in proportion. Ceramic phases are NiO and Fe 2 o 3 Composite oxide powder obtained by high-temperature calcination after the powder is uniformly mixed, and its composition is NiFe 2 o 4 +10% NiO, containing 0.5% BaO sintering aid. After the alloy phase powder and the ceramic phase powder are mixed in proportion, the cermet powder is obtained, and the cermet powder is pressed-sieved (-40 mesh+100 mesh) to obtain the cermet granulated powder, and then 1% of the total weight of the powder is added Stearic acid is used as a molding agent, mixed evenly, and then pressed into a steel mold at 100MPa to obtain a green body, and then sinter...

Embodiment 2

[0076] A cermet material for an aluminum electrolytic inert anode is formed by cold isostatic pressing. Calculated by mass fraction, the alloy phase content is 50%, and the elements and contents contained in the alloy phase are: 60% Fe, 30% Cu, 7% Ni, 3% Mn, and the raw material of the alloy phase is gas atomized alloy pink. The ceramic phase is 10% NiO, 3% MnO 2 and Fe 2 o 3 Composite oxide powder obtained by calcination at high temperature after uniform mixing of powders. After mixing alloy powder and composite ceramic powder in proportion, add PVA binder accounting for 1% of the total weight of the powder; pass through a 100-mesh sieve after spray granulation to obtain cermet mixed powder, and then pass through 200MPa isostatic pressing The green body is obtained by molding, degreased at 500°C in a nitrogen atmosphere, and then sintered in a circulating mixed atmosphere containing oxygen and protective atmosphere, wherein the partial pressure of oxygen is 800Pa, the sin...

Embodiment 3

[0079] A cermet material for an aluminum electrolytic inert anode formed by gel injection molding. Calculated by mass fraction, the content of the alloy phase is 60%, and the composition is 50% Fe, 35% Cu, 10% Ni, 3% Cr, 1.4% Mn, 0.5% Zn, 0.1% Ta; the ceramic phase is NiFe 2 o 4 +10%NiO, sintering aid is 2%MnO 2and 0.5 BaO. Mix alloy phase and ceramic phase powders in proportion, and obtain cermet powder with an average particle size of 4-5 μm after ball milling and sieving, and then mix cermet powder accounting for 40% by volume, 15 % of hydroxyethyl methacrylate, 2% of 1,6-hexanediol diacrylate, and 1% of surfactants are added to n-octanol, and the content of polyvinyl alcohol in surfactants It is 80%, and the rest is stearylamine acetate. Then carry out wet ball milling, wherein the ball milling speed is 200r / min, and the ball milling time is 12h. Obtain the cermet suspension that each component mixes homogeneously by ball milling, then add tert-butyl peroxybenzoate in...

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Abstract

The invention discloses a metal ceramic material for an aluminum electrolysis inert anode and a preparation method thereof. The metal ceramic material is composed of a metal phase and a ceramic phase. The mass fraction of the metal phase in the metal ceramic material is 20%-70%, preferably 38%-62%, the metal phase comprises Fe, Cu and Ni and also comprises at least one of Cr, Co and Mn, and the ceramic phase comprises NiFe2O4-based ceramic. According to the metal ceramic material, Cr, Co and Mn alloy elements introduced into an existing Fe-Cu-Ni alloy system have a certain promotion effect on formation of a corrosion-resistant layer of the metal phase, and therefore, the corrosion resistance of metal ceramic can be improved. Due to the fact that the corrosion resistance of an alloy phase is improved, the content of the alloy phase in the metal ceramic can be improved to 50% or above, the sintering activity of the metal ceramic material can be improved through the higher alloy content, and the electrode material with the higher density can be obtained by being matched with a proper preparation technology.

Description

technical field [0001] The invention relates to a cermet composite material, in particular to a cermet material for an aluminum electrolytic inert anode with higher corrosion resistance. Background technique [0002] In order to suppress the greenhouse effect of the aluminum electrolysis process and realize the emission of polluting gases, the aluminum electrolysis technology with the inert anode as the core is a strategic supporting technology for the upgrading of the aluminum industry and the pursuit of green development. Since the 1990s, domestic and foreign researchers in the aluminum industry have conducted a lot of related research, but there is still no inert anode available for industrialization, and the corrosion resistance of anode materials and corrosion inhibition technology have not been effectively resolved. NiFe 2 o 4 Metal-based cermets are favored by researchers because of their good thermal stability and corrosion resistance in high-temperature molten sal...

Claims

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Application Information

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IPC IPC(8): C25C3/12
CPCC25C3/12
Inventor 周科朝张雷李志友熊慧文
Owner CENT SOUTH UNIV
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