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Method for preparing TiB2 layer of cathode for aluminum electrolytic bath

A technology for aluminum electrolytic cells and cathodes, which is applied in the field of preparation of TiB2 gradient functional layer for cathodes of aluminum electrolytic cells with inert electrodes. Matching, thin coating thickness, avoiding the effect of early shedding

Inactive Publication Date: 2012-10-24
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

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Effect test

preparation example Construction

[0027] A kind of TiB of cathode for aluminum electrolytic cell 2 The preparation method of layer, its preparation process is will contain TiB 2 The powder, asphalt powder, graphite powder and aluminum sol spray slurry are sprayed with a spray gun to coat the surface of the cathode, and then sintered. The air spray gun spraying method is adopted to achieve low construction labor intensity and uniform and controllable coating thickness.

[0028] A kind of TiB of cathode for aluminum electrolytic cell 2 layer preparation method, the TiB 2 Gradient functional coating, from inside to outside, TiB 2 The content increases in a gradient to give full play to TiB 2 Good wettability with aluminum liquid, from the outside to the inside, the graphite content increases sequentially, giving full play to the good physical compatibility between graphite and carbon matrix, solving the thermal stress relaxation between the coating and the carbon matrix, and improving the adhesion of the coat...

Embodiment 1

[0046] Sprayed double-layered TiB 2 Gradient Functional Coating

[0047] (1) Spray the first layer of coating formula composition on the carbon substrate:

[0048] a.TiB 2 Powder: particle size 3~10μm, mass percentage content is 20%;

[0049] b. Asphalt powder: particle size 100~150μm, mass percentage 5%;

[0050] c. Graphite powder: particle size 5~10μm, 15% by mass;

[0051] d. 26% solid content aluminum sol mass percentage content is 60%;

[0052] Among them, the preparation process of the aluminum sol with 26% solid content is as follows: the aluminum sol is prepared with aluminum nitrate as the precursor, the content of aluminum nitrate is 26%, and the content of deionized water is 74%. Add aluminum nitrate to deionized water, stir at room temperature and slowly add 1mol / L ammonia water dropwise, adjust to PH=7.0~7.5, get precipitate, filter with suction, and then rinse repeatedly with deionized water to remove residual NO 3 - ion. Disperse and precipitate deioniz...

Embodiment 2

[0065] Sprayed double-layered TiB 2 Gradient Functional Coating

[0066] (1) Spray the first layer of coating formula composition on the carbon substrate:

[0067] a.TiB 2 Powder: particle size 3~10μm, mass percentage content is 50%;

[0068] b. Asphalt powder: particle size 100~150μm, mass percentage 10%;

[0069] c. Graphite powder: particle size 5~10μm, mass percentage 5%;

[0070] d. 9% solid content aluminum sol mass percentage content is 35%;

[0071] Among them, the preparation process of 9% solid content aluminum sol is as follows: aluminum sol is prepared with aluminum isopropoxide as a precursor, the content of aluminum isopropoxide is 9%, the content of deionized water is 90%, and the content of nitric acid is 1%. Add aluminum isopropoxide into deionized water, stir and heat to 85°C, hydrolyze for 1 hour, and filter with suction to obtain white boehmite precipitate. Wash repeatedly with deionized water. Then add nitric acid (the mass fraction of nitric acid i...

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Abstract

The invention provides a method for preparing a TiB2 layer of a cathode for an aluminum electrolytic bath and relates to a method for preparing a TiB2 gradient functional layer of the cathode suitable for an inert electrode aluminum electrolytic bath. The method is characterized in that spraying slurry containing TiB2 powder, asphalt powder, powdered graphite and aluminum sol is adopted to perform spaying coating to the cathode surface by means of a spray gun, and then sintering is performed. Nanoscale aluminum oxide sol is prepared by means of a sol-gel method, then the aluminum oxide sol and the TiB2 powder are evenly mixed according to different proportions, and fabric forming is performed by means of an air spray gun spraying-coating method after the slurry is prepared to achieve gradient distribution of the TiB2 functional layer. The preparation process is simple, thermal expansion match between the coating layer and a base body can be relieved through the gradient design of the functional coating layer, the bonding strength between the TiB2 coating layer and the base body is improved, the manufacture cost is far lower than the cost of a hot-pressing process, and the method is suitable for industrial mass production.

Description

technical field [0001] A kind of TiB of cathode for aluminum electrolytic cell 2 Layer preparation method, relates to a cathode TiB suitable for inert electrode aluminum electrolytic cells 2 Preparation method of gradient functional layer. Background technique [0002] The cathode material in the current aluminum electrolysis technology not only bears the conductive function, but also bears the chemical erosion of the high-temperature cryolite melt and the physical erosion of the aluminum liquid. Therefore, the performance of the cathode material directly affects the service life of the electrolytic cell. The current cell has always used carbonaceous material as the cathode material. However, the poor resistance to electrolyte penetration and poor wettability with molten aluminum seriously affect the efficient and stable operation of the electrolytic cell. [0003] TiB 2 Due to its excellent electrical conductivity, easy to be wetted by molten metals such as aluminum, exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08C25C3/08
Inventor 张刚杨建红乔佳李旺兴李兴彦
Owner GUIZHOU BRANCH CHINA ALUMINUM IND