Method for preparing La2O3 doped aluminium oxide base metal ceramic inert anode

An inert anode and cermet technology, applied in the field of materials, can solve the problems of concentration of anode and conductive rod, increase of anode current density, and low electrical conductivity, etc. full effect of growth

Inactive Publication Date: 2007-08-29
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the problems in the above-mentioned technologies are electrical conductivity and corrosion resistance. As an inert anode in an electrolytic cell, it must not only have strong corrosion resistance, but also have good electrical conductivity, and the change of electrical conductivity with temperature is not suitable. Too large, otherwise it will limit the increase of the anode current density, and sometimes cracks will be caused at the contact between the anode and the conductive rod due to local current concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018](1) Raw material ratio, the weight ratio of iron and nickel in the iron-nickel metal powder is 3: 3, on the basis of the mixture of iron-nickel metal powder 60% and alumina powder 40% by weight, plus the total amount of the above-mentioned mixture 1 % La 2 o 3 powder; (2) iron-nickel metal powder, alumina powder and La 2 o 3 The powder is mixed and put into a grinding tank and ground until it passes through a 250-mesh sieve, and then cold-pressed at 40Mpa by powder metallurgy to prepare a cermet inert anode material and dried; (3) in a silicon-molybdenum furnace with an argon atmosphere Buried alumina powder at 1450°C for 3 hours and sintered; (4) Under the protection of argon, the temperature in the silicon-molybdenum furnace dropped to room temperature at a cooling rate of ≤5°C / min to obtain La 2 o 3 Doped alumina-based cermet inert anode material, the composition of which is that La enters the aluminum site to form a spinel solid solution. Observation by scanning...

Embodiment 2

[0020] (1) Raw material ratio, the weight ratio of iron and nickel in the iron-nickel metal powder is 4: 3, on the basis that the weight ratio is 70% of iron-nickel metal powder and 30% of aluminum oxide powder, add 2% of the total amount of the mixture %La 2 o 3 powder; (2) iron-nickel metal powder, alumina powder and La 2 o 3 The powder is mixed and put into a grinding jar and ground until it passes through a 250-mesh sieve, and then cold-pressed at 160Mpa by a powder metallurgy method to prepare a cermet inert anode material and dried; (3) in a silicon-molybdenum furnace with an argon atmosphere Buried alumina powder at 1500 ° C for 2 hours; (4) under the protection of argon, the temperature in the silicon molybdenum furnace dropped to room temperature at a cooling rate of ≤ 5 ° C / min, that is, La 2 o 3 Doped alumina-based cermet inert anode material, the composition of which is that La enters the aluminum site to form a spinel solid solution. Observation by scanning...

Embodiment 3

[0022] (1) Raw material ratio, the weight ratio of iron and nickel in the iron-nickel metal powder is 5: 3, on the basis of the mixture of iron-nickel metal powder 80% and alumina powder 20% by weight, add 3% of the total amount of the mixture %La 2 o 3 powder; (2) iron-nickel metal powder, alumina powder and La 2 o 3 The powder is mixed and put into a grinding tank and ground until it passes through a 250-mesh sieve, and then cold-pressed at 40Mpa by powder metallurgy to prepare a cermet inert anode material and dried; (3) in a silicon-molybdenum furnace with an argon atmosphere Buried alumina powder at 1550 ° C for 1 hour; (4) under the protection of argon, the temperature in the silicon molybdenum furnace dropped to room temperature at a cooling rate of ≤ 5 ° C / min, that is, La 2 o 3 Doped alumina-based cermet inert anode material, the composition of which is that La enters the aluminum site to form a spinel solid solution. Observation by scanning electron microscope...

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Abstract

The invention provides a La2O3 doped aluminum oxide base metal ceramic inert anode preparing method, characterized in adopting the following steps of: (1) proportioning raw materials: on the basis of a mixture of Fe-Ni metal powder in 50wt%-80wt% and aluminum oxide powder in 20wt%-50wt%, adding in La2O3 powder in 1%-3% of total weight of the mixture; (2) mixing Fe-Ni metal powder, aluminum oxide powder and La2O3 powder and placing them in a grinding jar for grinding into particles able to pass through 250-mesh sieve, then adopting powder metallurgy to make cold press molding to prepare metal ceramic inert anode material and dry it; (3) burying aluminum oxide and sintering in a Si-Mo furnace charged with Ar gas at 1450-1550 deg.C for 1-3 h; (4) lowering the temperature in the Si-Mo furnace under the protection of Ar gas at a rate <=5deg.C / min to the room temperature and obtaining La2O3 doped aluminum oxide base metal ceramic inert anode material where La enters Al site to form spinel solid solution. And the anode material has features of high compactness, good conductivity and corrosion resistance, and being good for aluminum electrolysis.

Description

Technical field [0001] The invention patent provides a kind of La 2 o 3 The invention discloses a method for preparing an inert anode of doped alumina-based cermet, which belongs to the technical field of materials. Background technique [0002] Since the two patents of Hall and Herout in 1886 laid the foundation of the modern aluminum industry, the cryolite-alumina molten salt electrolysis method has always been the only aluminum smelting method in the aluminum industry. At present, the electrolytic aluminum industry uses carbon electrodes, which have many shortcomings. In the aluminum electrolytic cell, direct current is introduced from the anode into the cell, passes through the electrolyte layer, and is exported from the cathode, and an electrochemical reaction occurs at the anode-electrolyte interface to generate CO 2 And CO gas, on the cathode-electrolyte interface, liquid aluminum is produced, and the electrolysis temperature is usually 950-970°C. The anode is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 张丽鹏于先进董云会李德刚李忠芳
Owner SHANDONG UNIV OF TECH
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