TiB2-graphene composite cathode material for aluminum electrolysis and preparation method thereof

A graphene composite and cathode material technology, applied in the field of TiB2-graphene composite wettable cathode material for aluminum electrolysis and its preparation, TiB2-graphene composite cathode material for aluminum electrolysis and its preparation field, can solve the cathode life Shorten, easy to fall off, too thick coating and other problems, to achieve good performance against high temperature molten salt erosion, uniform density distribution, and improve the effect of dispersion

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
View PDF15 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent US5651874, CN201110274580.X, CN1986898A and patent CN200510046638.X introduce a TiB for aluminum electrolysis 2 -C composite material is used as the preparation method of cathode coating, but due to the poor thermal shock resistance or uneven thermal expansion coefficient of the coating material, the bonding strength between the coating and the substrate is low and it is easy to fall off; and the uneven thickness of the coating will cause Reduced cathode life (coating too thin) or cracking after sintering of the coating (coating too thick)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • TiB2-graphene composite cathode material for aluminum electrolysis and preparation method thereof
  • TiB2-graphene composite cathode material for aluminum electrolysis and preparation method thereof
  • TiB2-graphene composite cathode material for aluminum electrolysis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 95gTiB 2 Powder, 5g of graphene powder, 1g of water, 2g of epoxy resin and 1g of humic acid were mixed by ball mill for 4h, dried at 100°C for 10h, and subjected to vibration molding under a pressure of 200MPa to obtain TiB 2 - Graphene composite material green body, put the green body in an electric furnace, and perform degreasing treatment in an inert protective atmosphere, the degreasing temperature is 600 ° C, the degreasing time is 64h, and the oxygen content in the atmosphere is 50ppm; then in the Ar protective atmosphere The sintering process was carried out at a temperature of 50 °C / h to 1600 °C for sintering, and the temperature was kept for 5 h. During the sintering process, O 2 The content of TiB is 1ppm, and the sintering pressure is 2 tons; that is, TiB 2 - Graphene composite cathode material.

Embodiment 2

[0035] 60gTiB 2Powder, 40g graphene powder, 2g alcohol, 3g phenolic resin and 5g humic acid were mixed by ball mill for 6h, dried at 110°C for 10h, and vibrated under a pressure of 300MPa to obtain TiB 2 - Graphene composite green body, put the green body in an electric furnace, degrease in an inert protective atmosphere, the degreasing temperature is 800 ° C, the degreasing time is 48h, and the oxygen content in the atmosphere is 30ppm; then in the Ar protective atmosphere The sintering process was carried out at a temperature of 50 °C / h to 1500 °C for sintering, and the temperature was kept for 20 h. During the sintering process, O 2 The content of TiB is 5ppm, and the sintering pressure is 3 tons; that is, TiB 2 - Graphene composite cathode material.

Embodiment 3

[0037] 30gTiB 2 Powder, 70g of graphene powder, 5g of phthalic acid, 5g of polyethylene ethyl ester and 10g of humic acid were mixed by ball mill for 4 hours, dried at 100°C for 10 hours, and subjected to vibration molding under a pressure of 200MPa to obtain TiB 2 - Graphene composite material green body, put the green body in an electric furnace, degrease in an inert protective atmosphere, the degreasing temperature is 900 ° C, the degreasing time is 64h, and the oxygen content in the atmosphere is 10ppm; The sintering process was carried out at a temperature of 50°C / h to 1300°C for sintering, and the temperature was kept for 40h. During the sintering process, O 2 The content of TiB is 10ppm, and the sintering pressure is 4 tons; that is, TiB 2 - Graphene composite cathode material.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
electrical resistivityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a TiB2-graphene composite cathode material for aluminum electrolysis and a preparation method thereof. The method includes weighing 88-95 parts by weight of TiB2 powder, 5-12parts by weight of graphene powder, 0.2-5 parts by weight of a dispersant, 1-5 parts by weight of an adhesive and 1-10 parts by weight of humic acid; ball-milling and mixing the materials; drying themixture to obtain mixture powder, and keeping the mixture powder for later use; molding the mixture power to obtain a green body; subjecting the green body to degreasing treatment at 600-900 DEG C inan inert atmosphere for 16-64 h; then raising the temperature to 1300-1600 DEG C; and sintering the green body for 5-50 h to obtain the TiB2-graphene composite cathode material. The graphene is adopted as a reinforcing phase so that the composite cathode material has better wetting performance than existing TiB2/C wettable cathodes of aluminum electrolysis cells, and the graphene has high conductivity, corrosion resistance, a low thermal expansion coefficient tensile strength and other characteristics so that the composite cathode material has better resistance to high-temperature fused salt erosion, high-temperature structure stability, high conductivity, and the like.

Description

technical field [0001] The invention relates to a kind of TiB for aluminum electrolysis 2 -Graphene composite cathode material and preparation method thereof, specifically relating to a kind of TiB for aluminum electrolysis 2 - Graphene composite wettable cathode material and preparation method thereof, belonging to the field of preparation of aluminum electrolysis electrode materials. Background technique [0002] The current aluminum electrolysis technology mainly adopts the Hall-Héroult molten salt electrolysis method, which requires the cathode material not only to have high conductivity, but also to withstand the chemical and physical erosion of the high-temperature cryolite electrolyte. Therefore, the choice of cathode material has a great influence on the performance of the electrolytic cell Has a big impact. At present, aluminum electrolytic cells have always used carbonaceous materials as cathode materials. In order not to expose the carbon cathode to the electrol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/634C04B35/645C25C3/08
CPCC04B35/58071C04B35/634C04B35/645C04B2235/425C04B2235/48C04B2235/6562C25C3/08
Inventor 吕晓军官朝红陈昌韩泽勋
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap