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

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, coating structure dense effect

Active Publication Date: 2016-03-09
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

[0025] First prepare a titanium oxide sol with a solid content of 5% (which can also be purchased directly from the market), and then stir and mix 70% titanium boride (average particle size 5~10 μm) and 30% titanium oxide sol, and then heat it at 700°C The calcined material is then crushed through a 100-150 sieve to obtain a titanium boride-titanium oxide composite particle powder. Mix 55% titanium boride-titanium oxide composite particles, 8% graphite powder (with a particle size of 10-150), 5% petroleum coke (40-50 μm), 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 were placed in a kneading pot and stirred. The kneading temperature was 15°C, the relative humidity in the air was 30%, and the kneading time was For 5h, a coating slurry was obtained. The kneaded slurry is coated on the surface of the graphite base material, and the coating is performed according to the follo...

Embodiment 2

[0028] First prepare alumina sol with a solid content of 15%, then stir and mix 60% titanium boride and 40% alumina sol, and finally conduct 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 (particle size is 10-150μm), 3% electro-calcined anthracite (particle size is 100-150μm), 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, and 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. The kneaded slurry was coated on the surface of the graphite base material, cured at a constant temperature of 25 °C for 48 hours, and then cured at a constant temperature of 150 °C for 24 ho...

Embodiment 3

[0032] First prepare a silica sol with a solid content of 30%, then stir and mix 90% titanium boride and 10% silica sol, and finally calcinate 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-silica composite particles, 9.5% electro-calcined anthracite (particle size is 100-150μm), 5% pitch (particle size is 150-200μm), 3% phenolic resin, 2% epoxy resin, 5.5% % ethanol, 9% acetone, 0.5% ethylenediamine, 0.5% silicon carbide fiber are placed in a kneading pot and stirred, the kneading temperature is 35°C, the relative humidity in the air is 70%, and the kneading time is 2h to obtain a coating slurry; The kneaded slurry was coated on the surface of the graphite base material, cured at a constant temperature of 35 °C for 30 hours, and then cured at a constant temperature of 90 °C for 12 hours, and then placed in a graphite crucible into an electric furnace, an...

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Abstract

The invention discloses a titanium boride-based coating composite material for aluminum electrolysis and its preparation method and coating method. The composite material is composed of the following raw materials by weight percentage: titanium boride-oxide composite particles: 55%~ 70%; carbonaceous additives: 8%~15%; organic resin glue: 15%~30%; reinforcing agent: 0.5%~2%. The coating method includes the following steps: (1) putting the graphite base material into a coating mold, and then pouring the obtained slurry into the mold; (2) heating the base material coated with the slurry at 15°C~ Curing treatment at 35°C for 24h~48h, and then curing treatment at 80°C~150°C for 12h~24h; (3) Put the base material coated with slurry in step (2) in a graphite crucible, and bury graphite carbon powder, Then carry out carbonization and sintering in an inert gas atmosphere or in a vacuum; the carbonization and sintering temperature is 850-1050° C., and the carbonization and sintering time is 80h-120h. The titanium boride-based coating composite material for aluminum electrolysis of the invention has a high degree of bonding with a matrix, and the tensile strength can reach 8-10 MPa; the coating structure is compact and has strong erosion resistance.

Description

[0001] 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 [0002] 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 corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(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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