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A method for preparing an aluminum electrolytic metal-ceramic composite anode shell

A technology of ceramic composite and aluminum electrolysis, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of easy oxidation and corrosion of aluminum electrolytic metal inert anodes, achieve long-term stable operation, and avoid the effect of excessive oxidation

Inactive Publication Date: 2017-10-13
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on the problems existing in the current rotary kiln volatilization method, the present invention proposes a method for preparing an aluminum electrolytic metal-ceramic composite anode casing to solve the problem that the aluminum electrolytic metal inert anode is easy to oxidize and corrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for preparing an aluminum electrolytic metal-ceramic composite anode shell, specifically in accordance with the following steps:

[0029] Step 1, the Ni-Al master alloy containing 70% Ni element and 30% Al element in mass fraction is made into Ni-Al alloy powder through gas atomization equipment, and the atomization gas is nitrogen, and the prepared Ni-Al The alloy powder is sieved, and the particle size range of 10 μm to 45 μm is used as the raw material for spraying.

[0030] Step 2, annealing the Ni-Al alloy spraying raw material, the annealing temperature is 400°C, the holding time is 2 hours, and the hydrogen reducing atmosphere is used to eliminate the residual internal stress of the alloy powder;

[0031] Step 3, take a mass fraction of 5% ceramic powder and 95% Ni-Al alloy powder and put them into the mixer to fully mix to obtain Ni-Al alloy-ceramic spraying powder, wherein the ceramic powder is made of NiO and NiAl 2 o 4 Cera...

Embodiment 2

[0037] This embodiment provides a method for preparing an aluminum electrolytic metal-ceramic composite anode shell, specifically in accordance with the following steps:

[0038] Step 1, the Ni-Al master alloy containing 85% Ni element and 15% Al element by mass fraction is made into Ni-Al alloy powder through gas atomization equipment, the atomization gas is nitrogen, and the prepared Ni - Al alloy powder is sieved, and the particle size range of 10 μm to 45 μm is used as a spraying raw material.

[0039] Step 2, annealing the Ni-Al alloy spraying raw material, the annealing temperature is 600°C, the holding time is 5 hours, and the hydrogen reducing atmosphere is used to eliminate the residual internal stress of the alloy powder;

[0040] Step 3, take the mass fraction of 15% ceramic powder and 85% Ni-Al alloy powder and put them into the mixer to fully mix to obtain Ni-Al alloy-ceramic spraying powder, wherein the ceramic powder is made of NiO and NiAl 2 o 4 Ceramic powde...

Embodiment 3

[0046] This embodiment provides a method for preparing an aluminum electrolytic metal-ceramic composite anode shell, specifically in accordance with the following steps:

[0047] Step 1, the Ni-Al master alloy containing 75% Ni element and 25% Al element in mass fraction is made into Ni-Al alloy powder through gas atomization equipment, the atomization gas is nitrogen, and the prepared Ni - Al alloy powder is sieved, and the particle size range of 10 μm to 45 μm is used as a spraying raw material.

[0048] Step 2, annealing the Ni-Al alloy spraying raw material, the annealing temperature is 500°C, the holding time is 3 hours, and the hydrogen reducing atmosphere is used to eliminate the residual internal stress of the alloy powder;

[0049] Step 3, take the mass fraction of 10% ceramic powder and 90% Ni-Al alloy powder and put them into the mixer to fully mix to obtain Ni-Al alloy-ceramic spraying powder, wherein the ceramic powder is made of NiO and NiAl 2 o 4 Ceramic powde...

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Abstract

The invention provides a method for manufacturing an aluminum electrolytic metal-ceramic composite anode shell. According to the method, Ni-Al alloy-ceramic powder is sprayed to an anode base body through a cold spraying technology to form an anode shell; before Ni-Al alloy powder is mixed with ceramic powder, annealing treatment is carried out on the Ni-Al alloy powder; the Ni-Al alloy-ceramic powder serves as a spraying raw material, a cold spraying method is adopted to spray the powder to the surface of an alloy or metal base body to form the metal-ceramic composite anode shell of a compact structure, the thickness of the shell can reach several millimeters and even centimeters, and the shell can completely replace an internal anode base body to serve as a long-term stable aluminum electrolysis molten salt corrosion blocking layer.

Description

technical field [0001] The invention belongs to the field of anode materials, and relates to an anode casing, in particular to a method for preparing an aluminum electrolytic metal-ceramic composite anode casing. Background technique [0002] With the world's energy shortage and human beings' increasing attention to environmental issues, the problems of high energy consumption and high pollution caused by the traditional carbon anode aluminum electrolysis process are very serious. It is imminent to develop a new aluminum electrolysis process. Consuming the anode and producing a large amount of by-product oxygen around the anode has become a promising new process in this field, and may bring innovations in the production technology of the aluminum industry. [0003] Due to the harsh environment of high temperature oxidation and molten salt corrosion in the aluminum electrolytic cell, quite high requirements are put forward for the selection of the anode material of the electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12C23C24/04C22C32/00C22C19/03
CPCC22C19/03C22C32/001C23C24/04C25C3/12
Inventor 张文雪何成孙国栋李涛
Owner CHANGAN UNIV