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Cathode titanium diboride coating layer preparation method for aluminum electrolysis cell

A technology of aluminum electrolytic cell and titanium diboride, which is applied in the direction of coating, metal material coating technology, fusion spraying, etc., can solve the problems of insufficient compactness and poor thermal shock resistance, and achieve dense coating structure and improved quality, the effect of reducing industrial voltage

Active Publication Date: 2018-08-24
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the shortcomings of traditional atmospheric plasma spraying coatings such as poor thermal shock resistance and insufficient compactness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) TiB synthesized by high temperature self-propagating method 2 The powder is transported to the gaseous fluidized circulation treatment under the oxidizing atmosphere for 2 hours, the treatment temperature is 300°C, and the gas flow rate is 100L / h. Then, take 200 grams of the treated TiB 2 Put the powder in 1000 grams of deionized water, add 2 grams of cerium oxide, 10 grams of ethylene glycol, and 5 grams of tannic acid in sequence, and disperse it by mechanical ball milling for 4 hours to form a stable slurry;

[0024] (2) The slurry obtained in the previous step is granulated by high-speed centrifugal spraying to obtain agglomerated powder, and then placed in a vacuum furnace and vacuumed to 10 -5 Pa, sintered at 1500°C for 2h.

[0025] (3) Decontamination and cleaning the cathode surface of the aluminum electrolytic cell, using the sintered powder in step (2) as the feed material, and controlling the supersonic plasma spray gun to move at a uniform speed throug...

Embodiment 2

[0028] (1) TiB synthesized by high temperature self-propagating method 2 The powder is transported to the gaseous fluidized circulation treatment under the oxidizing atmosphere for 1 hour, the treatment temperature is 400°C, and the gas flow rate is 100L / h. Then, take 250 grams of the treated TiB 2 Put the powder in 1000 grams of deionized water, add 2 grams of cerium oxide, 20 grams of polyvinyl alcohol, and 7 grams of sodium cetyl sulfate in sequence, and disperse it by mechanical ball milling for 6 hours to form a stable slurry;

[0029] (2) The slurry obtained in the previous step is granulated by high-speed centrifugal spraying to obtain agglomerated powder, and then placed in a vacuum furnace and vacuumed to 10 -5 Pa, sintered at 1400°C for 2h.

[0030] (3) Decontamination and cleaning the cathode surface of the aluminum electrolytic cell, using the sintered powder in step (2) as the feed material, and controlling the supersonic plasma spray gun to move at a uniform sp...

Embodiment 3

[0033] (1) TiB synthesized by carbothermal reduction method 2 The powder is transported to the gaseous fluidized circulation treatment under the oxidizing atmosphere for 0.5 hours, the treatment temperature is 600°C, and the gas flow rate is 100L / h. Then, take 250 grams of the treated TiB 2 The powder is placed in 1000 grams of deionized water, followed by adding 2 grams of yttrium oxide, 10 grams of p-methylaniline polymer, and 5 grams of octadecyltrimethylammonium bromide, and mechanical ball milling for 8 hours to form a stable slurry;

[0034](2) The slurry obtained in the previous step is granulated by high-speed centrifugal spraying to obtain agglomerated powder, and then placed in a vacuum furnace and vacuumed to 10 -5 Pa, sintered at 1400°C for 2h.

[0035] (3) Decontamination and cleaning the cathode surface of the aluminum electrolytic cell, using the sintered powder in step (2) as the feed material, and controlling the supersonic plasma spray gun to move at a uni...

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Abstract

The invention discloses a cathode titanium diboride coating layer preparation method for an aluminum electrolysis cell. Powder pretreatment is combined with a supersonic plasma spraying technology toprepare a coating layer with compact structure and uniform components; the porosity is lower than 1%; the electric conductivity is higher than 100 S / cm; and such defects as weak thermal shock resistance and weak compactness in a traditional plasma spraying coating layer are solved. The coating layer is applied to a cathode of the aluminum electrolysis cell; on the one hand, the industrial voltageof the aluminum electrolysis cell can be reduced to improve the current efficiency; and on the other hand, the service life of the industrial aluminum electrolysis cell can be prolonged to improve thequality of aluminum electrolysis products.

Description

technical field [0001] The invention relates to a method for preparing a cathode titanium diboride coating for an aluminum electrolytic cell. Background technique [0002] Iron diboride (TiB 2 ) is a metalloid compound of hexagonal C32 type structure, and the structural parameters of its complete crystal are In the whole crystal structure, boron atomic planes and titanium atomic planes appear alternately to form a two-dimensional network structure, titanium atomic layers are closely packed, and boron atoms are six-coordinated and located in the center of the triangular prism of titanium atoms. where B - The outer shell has four electrons, each B - with three other B's - Combined with a covalent bond, the extra electron forms a spatially delocalized large Π. [0003] TiB 2 Has good electrical conductivity comparable to metals (10 -5 Ω m), strong resistance to metal aluminum liquid and fluoride salt melt corrosion performance and excellent wear resistance, and can be w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/10C25C3/08
CPCC23C4/10C23C4/134C25C3/08
Inventor 段晓华
Owner JIANGXI SCI & TECH NORMAL UNIV