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Titanium boride-based coating composite material for aluminum electrolysis, preparation method and coating method thereof

A composite material, titanium boride technology, applied in the field of electrochemistry, can solve the problems of large thermal shock, uneven coating thickness, rough surface, etc., to achieve strong erosion resistance, controllable coating thickness, and coating structure dense effect

Active Publication Date: 2013-07-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain deficiencies in the construction of the manual brushing method, such as: (1) low productivity and high labor intensity; (2) uneven coating thickness, rough and uneven surface; (3) thick brush coating, making When the electrolytic cell is energized, roasted and started, it is greatly affected by thermal shock, and the mismatch of thermal expansion coefficients leads to uneven thermal stress, which eventually leads to early peeling off of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First prepare titanium oxide sol with a solid content of 5% (it can also be purchased directly from the market), then stir and mix 70% titanium boride (average particle size 5-10 μm) and 30% titanium oxide sol, and then heat at 700 ° C Calcination treatment is carried out under the hood, and then the calcined material is crushed through 100-150 sieves to obtain titanium boride-titanium oxide composite particle powder. 55% titanium boride-titanium oxide composite particles, 8% graphite powder (particle size 10-150), 5% petroleum coke (40-50μm), 7% furan resin, 3.5% epoxy resin, 10% ethanol, 5.2% methyl ethyl ketone, 4% butyl acetate, 0.3% polyamide resin, 1% alumina fiber, 1% titanium carbide are placed in a kneading pot and stirred, the kneading temperature is 15°C, the relative humidity in the air is 30%, the kneading time For 5 h, a coating slurry was obtained. Coat the kneaded slurry on the surface of the graphite base material, and apply the following steps: put th...

Embodiment 2

[0030] First prepare alumina sol with a solid content of 15%, then stir and mix 60% titanium boride and 40% alumina sol, and finally perform calcination at 1000°C, and then crush the calcined material through a 100-150 mesh sieve The titanium boride-alumina composite particle powder was obtained. 70% titanium boride-alumina composite particles, 5% graphite powder (10-150μm particle size), 3% electric calcined anthracite (100-150μm particle size), 6% pitch (150-200μm), 4% Phenolic resin, 1.6% furfural resin, 4% ethanol, 3% acetone, 1% butyl acetate, 0.4% p-toluenesulfonic acid, and 2% carbon fiber were placed in a kneading pot and stirred. The kneading temperature was 25°C, and the relative humidity in the air was 50%, the kneading time is 6h, and the coating slurry is obtained. Coat the kneaded slurry on the surface of the graphite base material, solidify at a constant temperature of 25°C for 48 hours, and then solidify at a constant temperature of 150°C for 24 hours, then pl...

Embodiment 3

[0034] First prepare silica sol with a solid content of 30%, then stir and mix 90% titanium boride and 10% silica sol, and finally perform calcination at 900°C, and then crush the calcined material through a 100-150 mesh sieve The titanium boride-silicon oxide composite particle powder was obtained. 65% titanium boride-silicon oxide composite particles, 9.5% electrocalcined anthracite (particle size 100-150 μm), 5% pitch (particle size 150-200 μm), 3% phenolic resin, 2% epoxy resin, 5.5 % ethanol, 9% acetone, 0.5% ethylenediamine, and 0.5% silicon carbide fiber were placed in a kneading pot and stirred, the kneading temperature was 35°C, the relative humidity in the air was 70%, and the kneading time was 2 hours to obtain a coating slurry; Coat the kneaded slurry on the surface of the graphite base material, solidify at a constant temperature of 35°C for 30 hours, and then solidify at a constant temperature of 90°C for 12 hours, then place it in a graphite crucible and put it ...

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Abstract

The invention discloses a titanium boride-based coating composite material for aluminum electrolysis, a preparation method and a coating method thereof. The composite material consists of the following raw materials in percentage by weight: 55%-70% of titanium boride-oxide composite particles, 8%-15% of a carbon additive, 15%-30% of an organic resin adhesive and 0.5%-2% of a reinforcing agent. The coating method comprises the following steps: (1) putting a graphite base material into a coating mould, and then, pouring the obtained slurry into a mould; (2) curing the base material coated with the slurry at 15 DEG C-35 DEG C for 24h-48h, and then, curing the base material at 80 DEG C-150 DEG C for 12h-24h; and (3) putting the base material coated with the slurry into a graphite crucible, filling graphite carbon powder into the graphite crucible, and carbonizing and sintering the graphite crucible in an inert gas atmosphere or in vacuum, wherein the carbonizing and sintering temperature is 850-1050 DEG C, and the carbonizing and sintering time is 80-120 hours. The titanium boride-based coating composite material for aluminum electrolysis has high combination degree with a base and good tensile strength high up to 8-10MPa; and a coating structure is dense and has strong anti-scouring property.

Description

[0001] [0002] Technical Field The present invention relates to the field of electrochemistry, in particular to a cathode titanium boride-based composite material suitable for inert electrode aluminum electrolysis and its preparation technology. Background technique [0003] The cathode material in the aluminum electrolysis technology not only has to carry the conductivity, but also bears the chemical erosion of the high-temperature cryolite melt and the physical erosion of the aluminum liquid. The aluminum electrolysis cells in the prior art generally use carbonaceous cathode materials. Poor electrolyte penetration resistance and poor wettability with molten aluminum seriously affect the efficient and stable operation of the electrolytic cell. Titanium boride has become the material of choice for the manufacture of wettable inert cathodes for aluminum electrolysis due to its excellent electrical conductivity, easy wettability by molten metals such as aluminum, and excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12C04B41/50C25C3/08
Inventor 张刚杨建红李庆余张艳伟赵欣郑达彭伟平张朝晖
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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