Method for preparing inert anode material by compounding AlCrFeNiV high-entropy alloy and ceramic

Abstract

The invention belongs to the technical field of aluminum electrolysis, and relates to preparation and application of a metal ceramic inert anode material for aluminum electrolysis. The material for the metal ceramic inert anode is formed by compounding a high-entropy alloy phase and a ceramic phase; according to the preparation method disclosed by the invention, the AlCrFeNiV high-entropy alloy and the NiFe2O4 spinel ceramic are compounded to prepare the metal oxide ceramic. The manufacturing method of the metal ceramic inert anode is easy to operate, efficient and beneficial to application and popularization. And in an electrolytic test with the electrolyte being a cryolite-aluminum oxide system at 960 DEG C, good high-temperature conductivity, electrochemical stability, corrosion resistance and thermal shock resistance are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum electrolysis, and in particular to a high-performance metal-ceramic inert anode composite material for aluminum electrolysis and a preparation method thereof. Background Art

[0002] Aluminum electrolysis is a key area of ​​focus for the country's dual carbon goals and a key industry for emission reduction. Currently, the industrial production of aluminum primarily utilizes the cryolite-alumina molten electrolysis method (Hall-Heroult molten salt electrolysis method). This process uses carbon materials as anodes. Al2O3 in a high-temperature molten electrolyte decomposes under the action of an electric field, producing oxygen ions that combine with carbon, consuming the carbon anode and releasing CO2 gas. Inert anodes, on the other hand, do not react with oxygen anions during the reaction, producing no CO2 and instead generating O2 for recycling. Research and application of aluminum electrolysis technology using inert anode materials is extremely important and is of great significance for the aluminum industry in achieving energy conservation, environmental protection, emission reduction, and efficiency improvements.

[0003] Currently, inert anodes are primarily classified into three categories: alloy systems, oxide-ceramic systems, and cermet systems. While alloy systems offer high electrical conductivity, they suffer from poor corrosion resistance and cannot sustain long-term electrolysis in high-temperature molten salt systems. Oxide-ceramic systems, while offering strong corrosion resistance, suffer from poor electrical conductivity, making them unsuitable for industrial production. Cermet systems, on the other hand, are composite materials of metal and ceramic, combining the high electrical conductivity of metals with the strong corrosion resistance of ceramics, while also exhibiting excellent thermal stability, thermal shock resistance, and processing properties. Among cermet systems, NiFe2O4, due to its inverse spinel structure, possesses excellent mechanical properties and superior corrosion resistance, making it widely used as a ceramic substrate for bonding to various metals, as in CN 117403279A and CN 13186569A. However, the current NiFe2O4-based cermet inert anodes suffer from a persistent trade-off between high-temperature conductivity and corrosion resistance, making it difficult to achieve a breakthrough in electrical conductivity while maintaining a low corrosion rate.

[0004] The inventors have published a patent (CN 113249755 A) disclosing a high-entropy alloy inert anode and its preparation method. This method adds a high-entropy alloy (a high-entropy alloy synthesized from five or more elements of Al, Co, Cr, Fe, Ni, Ti, and Cu) to nickel ferrite. Compared with conventional metal ceramic inert anodes, this inert anode material has stronger corrosion resistance, mechanical properties, and conductivity in cryolite molten salt systems, which can improve the service life of the inert anode. The present invention uses a high-entropy alloy containing Al and V and nickel ferrite to improve the compatibility of the high-entropy alloy and nickel ferrite, making the prepared inert anode more conductive at high temperatures.

[0005] A new high entropy alloy AlCrFeNiV is introduced into the NiFe2O4-based metal ceramic inert anode of the present invention. The prepared metal ceramic inert anode has excellent electrical conductivity, corrosion resistance and thermal shock resistance at a high temperature of 960°C. Summary of the Invention

[0006] The purpose of the present invention is to address the problems existing in the prior art and provide a method for preparing and applying a metal ceramic inert anode that can be used in the electrolytic aluminum industry. The metal ceramic inert anode has good corrosion resistance, high-temperature conductivity and electrochemical stability, and can be used to reduce carbon emissions and improve energy utilization in the current aluminum electrolysis industry.

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A method for preparing a metal ceramic inert anode material for aluminum electrolysis, characterized in that it comprises a high entropy alloy phase and a ceramic phase, wherein the high entropy alloy is AlCrFeNiV; and the ceramic phase comprises metal oxides and NiFe2O4 spinel oxide ceramics.

[0009] The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that the common metal oxides are V2O5, MnO2 and NiO; and the NiFe2O4 spinel oxide ceramics are synthesized by sintering single-phase metal oxides, and the single-phase metal oxides are NiO and Fe2O3 powders.

[0010] The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that, in the ceramic phase, common metal oxides account for 1% to 20% of the total mass of the ceramic phase, and the remainder is NiFe2O4 spinel oxide ceramic.

[0011] The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that the high entropy alloy phase accounts for 10 to 50% of the total mass of the metal-ceramic inert composite anode material, and the particle size of the high entropy alloy is 1 to 53 μm.

[0012] The method for preparing the modified metal-ceramic inert anode composite material for aluminum electrolysis according to any one of claims 1 to 4 is characterized by comprising the following steps:

[0013] S1: Common metal oxides and single-phase metal oxides are mixed and ball-milled in proportion to obtain a ceramic matrix raw material, which is then dried and cold-pressed and pre-sintered to obtain a ceramic matrix block;

[0014] S2: Crush and screen the ceramic matrix block to obtain ceramic matrix powder, add high entropy alloy powder, and ball-mill the mixture in a dispersant to obtain a metal-ceramic slurry, which is then dried to obtain a metal-ceramic powder;

[0015] S3: adding a binder, ball-milling the mixture and drying it, ball-milling and sieving it in a vacuum ball mill, and then cold-pressing it to obtain a green body;

[0016] S4: heating the anode green body to a sintering temperature under an inert atmosphere, keeping the temperature for a certain period of time, and then naturally cooling the green body to room temperature to obtain a metal ceramic inert anode.

[0017] The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that: in step S1, the cold pressing pressure is 200-800 MPa, and the holding time is 5-20 minutes; the pre-sintering temperature is 1000-1600°C, and the holding time is 4-12 hours.

[0018] The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that: in the step S2, the dispersant is ethanol or deionized water, the mass ratio of the dispersant to the raw material is 2:1 to 6:1, and the raw materials are high entropy alloy and ceramic matrix powder.

[0019] The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that: in step S3, the binder is polyvinyl alcohol, and the amount of the binder added is 1 to 10% of the mass of the metal-ceramic powder; the pressure of the cold pressing is 200 to 800 MPa, and the holding time is 5 to 20 minutes.

[0020] The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1 is characterized in that: in step S4, the inert atmosphere is argon, the sintering temperature is 1000-1600°C, and the holding time is 4-12 hours.

[0021] Compared with the prior art, the present invention has the following advantages and positive effects:

[0022] 1. The metal ceramic inert anode of the present invention accurately controls the type and content of raw materials, and by adding metal oxides, vacuum hot pressing and sintering can obtain metal ceramic inert anode materials with excellent performance. The method is simple and suitable for industrial production.

[0023] 2. The metal ceramic inert anode of the present invention has good electrochemical stability and molten salt corrosion resistance. Its molten salt corrosion resistance at 960°C is 1.9 cm / y, and its high-temperature conductivity reaches 264 S / cm. It can be used in the industrialization of aluminum electrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The morphology characteristics of the high entropy alloy powder obtained in Example 1.

[0025] Figure 2The high-temperature conductivity and Seebeck coefficient of the metal ceramic inert anode of Example 1 are shown.

[0026] Figure 3 This is a cross-sectional morphology of the metal ceramic inert anode of Example 1 after corrosion in a 960°C electrolyte for 20 hours. DETAILED DESCRIPTION

[0027] The present invention is further described below by way of examples, but the present invention is not limited to the examples described.

[0028] The experimental methods in the following examples without specific conditions are selected according to conventional methods and conditions, or according to the product instructions.

[0029] Example 1

[0030] The preparation method of the metal-ceramic inert anode composite material for aluminum electrolysis of this embodiment is as follows:

[0031] The material for the metal ceramic inert anode consists of a metal phase and a ceramic phase; the raw material powder used for the ceramic phase includes Fe2O3 powder, NiO powder, MnO2 powder, V2O5 powder, and PVA powder. In terms of mass fraction, the mass fraction of Fe2O3 powder is 57.11%, the mass fraction of NiO powder is 41.39%, the mass fraction of MnO2 powder is 1%, and the mass fraction of V2O5 powder is 0.5%. The materials were ball-milled in a ball mill with a ball-to-material ratio of 3:1. Deionized water was used as a dispersant and the materials were ball-milled for 12 hours. After ball milling, the mixed material was placed in a 70°C forced air drying oven for drying for 24 hours. The dried materials were cold-pressed at 600 MPa and held for 10 minutes. The formed raw materials were sintered in a box furnace at a heating rate of 10 m°C / min to 1000°C, held for 6 hours, and naturally cooled in the furnace to obtain 85NiFe2O4-15NiO ceramic matrix materials. The obtained 85NiFe2O4-15NiO ceramic matrix materials were ball-milled using grinding balls with a diameter of 15 mm, and ground through a 200-mesh sieve to obtain 85NiFe2O4-15NiO ceramic matrix powder particles.

[0032] The metal phase is composed of five metal elements, namely Al, Ni, Cr, Fe and V, which are calculated and weighed in an equimolar atomic ratio. The metal is smelted into button ingots in an electric arc furnace, and then the button ingots are ball-milled and crushed by mechanical alloying. Before the ball milling operation, the ball mill jar is evacuated and filled with argon for three times to ensure that the ball milling dry grinding process is in an inert gas protection environment. The ball mill speed is 400r / min, the ball-to-material ratio is 3:1, and the ball milling is carried out for 12 hours. The high entropy alloy granulated powder is sent to the radio frequency plasma spheroidization powder making system for spheroidization treatment to obtain spherical powder, such as Figure 1 .

[0033] In the material used for the metal-ceramic inert anode, the metal phase accounts for 20% by mass, and the rest is the ceramic phase. The ceramic and metal phases are mixed in proportion and 2% by mass of PVA powder is added. The mixture is ball-milled in a ball mill at a speed of 400 r / min. The ball-to-material ratio is 3:1, and the mixture is ball-milled for 12 hours. The mixture is dried in an 80°C forced air drying oven for 24 hours using alcohol as a dispersant. The dried powder block is ball-milled in a vacuum ball mill at a ball-to-material ratio of 3:1 for 4 hours. The mixture is then filtered through a 100-mesh sieve to obtain a high-entropy metal-ceramic composite material that meets the particle size requirements and is uniformly mixed.

[0034] The obtained metal-ceramic composite powder was cold pressed and maintained at 600 MPa for 5 minutes to obtain a secondary green body, which was sintered and kept warm for 6 hours in a tube furnace at 1300°C under a protective atmosphere to obtain a metal-ceramic inert anode composite material doped with high-entropy alloy. The obtained inert anode block material was wire-cut and then polished with 600#, 1000#, and 2000# water-abrasive sandpaper in sequence. The treated sample was cleaned and dried in a vacuum drying oven to obtain the final inert anode material to be tested.

[0035] The metal ceramic inert anode of this embodiment was electrolyzed at 960°C for 12 hours in a small aluminum electrolysis cell, and its equivalent molten salt corrosion resistance was 1.9 cm / a, its high-temperature conductivity reached 264 S / cm, and tiny cracks appeared after 21 thermal shock cycles at 960°C. The average working voltage was 3.4 V.

[0036] Example 2

[0037] The material for the cermet inert anode is composed of a metal phase and a ceramic phase;

[0038] The raw material powders used for the ceramic phase include Fe2O3 powder, NiO powder, MnO2 powder, V2O5 powder, and PVA powder. In terms of mass fraction, the mass fraction of Fe2O3 powder is 57.11%, the mass fraction of NiO powder is 41.39%, the mass fraction of MnO2 powder is 1%, and the mass fraction of V2O5 powder is 0.5%. The materials are ball milled and mixed in a ball mill with a ball-to-material ratio of 3:1. Deionized water is used as a dispersant. The ball milling is carried out for 12 hours. After ball milling, the mixed material is placed in a 70℃ forced air drying oven and dried for 24 hours. The dried material is cold pressed at 600MPa and maintained at pressure for 10 minutes. The formed raw materials are sintered in a box furnace, heated to 1000℃ at a heating rate of 10m℃ / min, kept warm for 6 hours, and cooled naturally in the furnace.

[0039] The 85NiFe2O4-15NiO ceramic matrix material was crushed by ball milling with a grinding ball of 15 mm in diameter and then ground through a 200-mesh sieve to obtain

[0040] 85NiFe2O4-15NiO ceramic matrix powder particles.

[0041] The metal phase consists of five metal elements, Al, Ni, Cr, Fe, and V, calculated and weighed in equal molar atomic ratios. The metal is smelted into button ingots in an electric arc furnace, which are then ball-milled using mechanical alloying. Before ball milling, the mill jar is evacuated and purged with argon three times to ensure an inert gas atmosphere during the dry milling process. The milling speed is 400 r / min, the ball-to-material ratio is 3:1, and the milling is performed for 12 hours. The high-entropy alloy granulated powder is fed into a radio frequency plasma spheroidization system for spheroidization to obtain spherical powder.

[0042] In the material for a metal-ceramic inert anode, the metal phase accounts for 10% by mass, with the remainder being the ceramic phase. The ceramic and metal phases are mixed proportionally and 2% by mass of PVA powder is added. The mixture is ball-milled at a speed of 400 r / min. The mixture is milled for 12 hours at a ball-to-powder ratio of 3:1. After the mixture is dried in an 80°C forced air drying oven for 24 hours using alcohol as a dispersant, the dried powder block is ball-milled in a vacuum mill at a ball-to-powder ratio of 3:1 for 4 hours. The mixture is then filtered through a 100-mesh sieve to obtain a high-entropy metal-ceramic composite material that meets the particle size requirements and is uniformly mixed.

[0043] The obtained metal-ceramic composite powder was cold pressed and maintained at 600 MPa for 5 minutes to obtain a secondary green body, which was sintered and kept warm for 6 hours in a tube furnace at 1300°C under a protective atmosphere to obtain a metal-ceramic inert anode composite material doped with high-entropy alloy. The obtained inert anode block material was wire-cut and then polished with 600#, 1000#, and 2000# water-abrasive sandpaper in sequence. The treated sample was cleaned and dried in a vacuum drying oven to obtain the final inert anode material to be tested.

[0044] The metal ceramic inert anode of this embodiment was electrolyzed at 960°C for 12 hours in a small aluminum electrolysis cell, and its equivalent molten salt corrosion resistance was 1.8 cm / a, its high-temperature conductivity reached 159 S / cm, and tiny cracks appeared after 27 thermal shock cycles at 960°C. The average working voltage was 3.1 V.

[0045] Example 3

[0046] The material for the cermet inert anode is composed of a metal phase and a ceramic phase;

[0047] The raw material powders used for the ceramic phase include Fe2O3 powder, NiO powder, MnO2 powder, V2O5 powder, and PVA powder. In terms of mass fraction, the mass fraction of Fe2O3 powder is 57.11%, the mass fraction of NiO powder is 41.39%, the mass fraction of MnO2 powder is 1%, and the mass fraction of V2O5 powder is 0.5%. The materials are ball milled and mixed in a ball mill with a ball-to-material ratio of 3:1. Deionized water is used as a dispersant. The ball milling is carried out for 12 hours. After ball milling, the mixed material is placed in a 70℃ forced air drying oven and dried for 24 hours. The dried material is cold pressed at 600MPa and maintained at a pressure of 10 minutes. The formed raw materials are sintered in a box furnace, heated to 1000℃ at a heating rate of 10m℃ / min, kept at this temperature for 6 hours, and cooled naturally in the furnace.

[0048] The 85NiFe2O4-15NiO ceramic matrix material was crushed by ball milling with a grinding ball of 15 mm in diameter and then passed through a 200 mesh sieve to obtain

[0049] 85NiFe2O4-15NiO ceramic matrix powder particles.

[0050] The metal phase consists of five metal elements, Al, Ni, Cr, Fe, and V, calculated and weighed in equal molar atomic ratios. The metal is smelted into button ingots in an electric arc furnace, which are then ball-milled using mechanical alloying. Before ball milling, the mill jar is evacuated and purged with argon three times to ensure an inert gas atmosphere during the dry milling process. The milling speed is 400 r / min, the ball-to-material ratio is 3:1, and the milling is performed for 12 hours. The high-entropy alloy granulated powder is fed into a radio frequency plasma spheroidization system for spheroidization to obtain spherical powder.

[0051] In the material for a metal-ceramic inert anode, the metal phase accounts for 5% by mass, with the remainder being the ceramic phase. The ceramic and metal phases are mixed proportionally and 2% by mass of PVA powder is added. The mixture is ball-milled at a speed of 400 r / min. The mixture is milled for 12 hours at a ball-to-powder ratio of 3:1. After the mixture is dried in an 80°C forced air drying oven for 24 hours using alcohol as a dispersant, the dried powder mass is ball-milled in a vacuum mill at a ball-to-powder ratio of 3:1 for 4 hours. The mixture is then filtered through a 100-mesh sieve to obtain a high-entropy metal-ceramic composite material that meets the particle size requirements and is uniformly mixed.

[0052] The obtained metal-ceramic composite powder was cold pressed and maintained at 600 MPa for 5 minutes to obtain a secondary green body, which was sintered and kept warm for 6 hours in a tube furnace at 1300°C under a protective atmosphere to obtain a metal-ceramic inert anode composite material doped with high-entropy alloy. The obtained inert anode block material was wire-cut and then polished with 600#, 1000#, and 2000# water-abrasive sandpaper in sequence. The treated sample was cleaned and dried in a vacuum drying oven to obtain the final inert anode material to be tested.

[0053] The metal ceramic inert anode of this embodiment was electrolyzed at 960°C for 12 hours in a small aluminum electrolysis cell, and its equivalent molten salt corrosion resistance was 1.3 cm / a, its high-temperature conductivity reached 54 S / cm, and tiny cracks appeared after 28 thermal shock cycles at 960°C. The average working voltage was 2.9 V.

[0054] Example 4

[0055] The material for the cermet inert anode is composed of a metal phase and a ceramic phase;

[0056] The raw material powders used for the ceramic phase include Fe2O3 powder, NiO powder, MnO2 powder, V2O5 powder, and PVA powder. In terms of mass fraction, the mass fraction of Fe2O3 powder is 57.11%, the mass fraction of NiO powder is 41.39%, the mass fraction of MnO2 powder is 1%, and the mass fraction of V2O5 powder is 0.5%. The materials are ball milled and mixed in a ball mill with a ball-to-material ratio of 3:1. Deionized water is used as a dispersant. The ball milling is carried out for 12 hours. After ball milling, the mixed material is placed in a 70℃ forced air drying oven and dried for 24 hours. The dried material is cold pressed at 600MPa and maintained at a pressure of 10 minutes. The formed raw materials are sintered in a box furnace, heated to 1000℃ at a heating rate of 10m℃ / min, kept at this temperature for 6 hours, and cooled naturally in the furnace.

[0057] The 85NiFe2O4-15NiO ceramic matrix material is crushed by ball milling using grinding balls with a diameter of 15 mm, and the obtained 85NiFe2O4-15NiO ceramic matrix material is ground through a 200-mesh sieve to obtain 85NiFe2O4-15NiO ceramic matrix powder particles.

[0058] The metal phase consists of five metal elements, Co, Cr, Ni, Fe, and Cu, calculated and weighed in equal molar atomic ratios. The metals are smelted in an electric arc furnace to form button ingots, which are then ball-milled using mechanical alloying. Before ball milling, the mill jar is evacuated and purged with argon three times to ensure an inert gas atmosphere during the dry milling process. The milling speed is 400 r / min, the ball-to-material ratio is 3:1, and the milling is performed for 12 hours. The high-entropy alloy granulated powder is fed into a radio frequency plasma spheroidization system for spheroidization to obtain spherical powder.

[0059] In the material for a metal-ceramic inert anode, the metal phase accounts for 5% by mass, with the remainder being the ceramic phase. The ceramic and metal phases are mixed proportionally and 2% by mass of PVA powder is added. The mixture is ball-milled at a speed of 400 r / min. The mixture is milled for 12 hours at a ball-to-powder ratio of 3:1. After the mixture is dried in an 80°C forced air drying oven for 24 hours using alcohol as a dispersant, the dried powder mass is ball-milled in a vacuum mill at a ball-to-powder ratio of 3:1 for 4 hours. The mixture is then filtered through a 100-mesh sieve to obtain a high-entropy metal-ceramic composite material that meets the particle size requirements and is uniformly mixed.

[0060] The obtained metal-ceramic composite powder was cold pressed and maintained at 600 MPa for 5 minutes to obtain a secondary green body, which was sintered and kept warm for 6 hours in a tube furnace at 1300°C under a protective atmosphere to obtain a metal-ceramic inert anode composite material doped with high-entropy alloy. The obtained inert anode block material was wire-cut and then polished with 600#, 1000#, and 2000# water-abrasive sandpaper in sequence. The treated sample was cleaned and dried in a vacuum drying oven to obtain the final inert anode material to be tested.

[0061] The metal ceramic inert anode of this embodiment was electrolyzed at 960°C for 12 hours in a small aluminum electrolysis cell, and its equivalent molten salt corrosion resistance was 8 cm / a. Its high-temperature conductivity reached 54 S / cm. Microcracks appeared after 12 thermal shock cycles at 960°C, and its average operating voltage was 2.7 V.

Claims

1. A method for preparing a metal ceramic inert anode material for aluminum electrolysis, characterized in that: It includes a high entropy alloy phase and a ceramic phase, wherein the high entropy alloy is AlCrFeNiV; and the ceramic phase includes metal oxide and NiFe2O4 spinel oxide ceramic.

2. The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that The common metal oxides are V2O5, MnO2 and NiO; the NiFe2O4 spinel oxide ceramics are sintered by single-phase metal oxides, and the single-phase metal oxides are NiO and Fe2O3 powders.

3. The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: In the ceramic phase, common metal oxides account for 1% to 20% of the total mass of the ceramic phase, and the remainder is NiFe2O4 spinel oxide ceramics.

4. The metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: The high entropy alloy phase accounts for 10-5% of the total mass of the metal-ceramic inert composite anode material, and the particle size of the high entropy alloy is 1-53 μm.

5. The method for preparing the modified metal-ceramic inert anode composite material for aluminum electrolysis according to any one of claims 1 to 4, characterized in that The following steps are involved: S1: Common metal oxides and single-phase metal oxides are mixed and ball-milled in proportion to obtain a ceramic matrix raw material, which is then dried and cold-pressed and pre-sintered to obtain a ceramic matrix block; S2: Crush and screen the ceramic matrix block to obtain ceramic matrix powder, add high entropy alloy powder, and ball-mill the mixture in a dispersant to obtain a metal-ceramic slurry, which is then dried to obtain a metal-ceramic powder; S3: adding a binder, ball-milling the mixture and drying it, ball-milling and sieving it in a vacuum ball mill, and then cold-pressing it to obtain a green body; S4: heating the anode green body to a sintering temperature under an inert atmosphere, keeping the temperature for a certain period of time, and then naturally cooling the green body to room temperature to obtain a metal ceramic inert anode.

6. The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: In step S1, the cold pressing pressure is 200-800 MPa, and the holding time is 5-20 minutes; the pre-sintering temperature is 1000-1600° C., and the holding time is 4-12 hours.

7. The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: In the step, the S2 dispersant is ethanol or deionized water, the mass ratio of the dispersant to the raw material is 2:1 to 6:1, and the raw materials are high entropy alloy and ceramic matrix powder.

8. The method for preparing a metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: In step S3, the binder is polyvinyl alcohol, and the amount of the binder added is 1-10% of the mass of the metal ceramic powder; the pressure of the cold pressing is 200-800 MPa, and the holding time is 5-20 minutes.

9. The method for preparing the metal-ceramic inert anode composite material for aluminum electrolysis according to claim 1, characterized in that: In step S4, the inert atmosphere is argon, the sintering temperature is 1000-1600° C., and the holding time is 4-12 hours.

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