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NiFe2O4 conducting material and preparation method thereof

A conductive material, fe2o3 technology, applied in the field of aluminum electrolysis, can solve problems such as poor conductivity, poor substrate wettability, and difficulty in ensuring composition uniformity, and achieve the effects of improved wettability, less agglomeration, and easy powder agglomeration.

Active Publication Date: 2018-02-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among many types of inert anodes, NiFe 2 o 4 Ceramic-based inert anodes have the advantages of high temperature resistance, high strength, good thermal stability, and corrosion resistance to cryolite melts, but as ceramic materials, they also have the disadvantage of poor electrical conductivity
The current solution is to ask NiFe 2 o 4 Adding a certain metal or alloy powder to the material, such as Cu, Ni, Ag, etc., can improve its conductivity, but due to the metal and NiFe 2 o 4 The wettability of the matrix is ​​very poor, so it is difficult to ensure the uniformity of the composition during the sintering process

Method used

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  • NiFe2O4 conducting material and preparation method thereof
  • NiFe2O4 conducting material and preparation method thereof
  • NiFe2O4 conducting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Doping TiN

[0037] NiO, Fe 2 o 3 Mix with nano-TiN raw materials in proportion, in which NiO and Fe 2 o 3 The mass ratio is 21:29, and the amount of nano-TiN is NiO and Fe 2 o 3 3% of the total mass. Using absolute ethanol as a dispersant, mix in a ball mill for 10 hours. After mixing, age for 5 hours, vacuum-dry at 110° C., and then grind into powder, and add 1% dextrin of the total mass of the material and mix evenly. Afterwards, the mixed material is subjected to compression molding, and the molding pressure is 200 MPa. After molding, it was sintered under an argon atmosphere at a temperature of 1200°C for 4 hours, and nano-TiN-doped NiFe was obtained after sintering. 2 o 4 Material. Its conductivity was measured at 950°C, and the result showed that its conductivity was: 4.02Ω -1 cm -1 . Such as image 3 For the NiFe used in this embodiment 2 o 4 SEM image of the material. from image 3 It can be seen that Nano-TiN can refine the grain s...

Embodiment 2

[0038] Example 2: Doping TiN and TiC

[0039] NiO, Fe 2 o 3 , nano-TiN, nano-TiC powder raw materials are mixed in proportion, in which NiO and Fe 2 o 3 The mass ratio is 2:3, and the amount of nano-TiN is NiO and Fe 2 o 3 2.5% of the total mass, TiC dosage is NiO and Fe 2 o 3 1.5% of the total mass. Using absolute ethanol as a dispersant, mix in a ball mill for 10 hours. After mixing, age for 3 hours, vacuum-dry at 110° C., and then grind into powder, and add 1% dextrin of the total mass of the material and mix evenly. Afterwards, the mixed materials were press-molded, and the molding pressure was 180MPa. After molding, it was sintered under an argon atmosphere at a temperature of 1150°C for 5 hours, and nano-TiN-doped NiFe was obtained after sintering. 2 o 4 Material. Its conductivity was measured at 950°C, and the result showed that its conductivity was 3.56Ω -1 cm -1 . Such as Figure 4 For the NiFe used in this embodiment 2 o 4 SEM image of the material....

Embodiment 3

[0040] Example 3: Doping TiN and VC

[0041] NiO, Fe 2 o 3 , nano-TiN, nano-VC powder raw materials are mixed in proportion, among which NiO and Fe 2 o 3 The mass ratio is 21:29, and the amount of nano-TiN is NiO and Fe 2 o 3 3.5% of the total mass, the amount of VC is NiO and Fe 2 o 3 1% of the total mass. Using absolute ethanol as a dispersant, mix in a ball mill for 10 hours. After mixing, age for 5 hours, vacuum-dry at 110° C., and then grind into powder, and add 1% dextrin of the total mass of the material and mix evenly. Afterwards, the mixed materials were press-molded, and the molding pressure was 160MPa. After molding, it was sintered under an argon atmosphere at a temperature of 1250°C for 4 hours, and nano-TiN-doped NiFe was obtained after sintering. 2 o 4 Material. Its conductivity was measured at 950°C, and the result showed that its conductivity was: 6.39Ω -1 cm -1 . Figure 4 For the NiFe used in this embodiment 2 o 4 SEM image of the material. ...

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Abstract

The invention discloses a novel NiFe2O4 conducting material and a preparation method thereof. The material comprises a NiFe2O4 matrix, and nano TiN and other additives doped therein. The preparation method comprises the following steps: mixing NiO powder, Fe2O3 powder, the nano TiN powder and the other additives, adding a dispersing agent into the mixture, and performing uniform mixing; performingaging, drying and grinding to obtain powder; adding an adhesive, performing uniform mixing, and performing pressure molding on the mixture; and performing sintering in a protective atmosphere to obtain the NiFe2O4 conducting material. By adding the TiN in the NiFe2O4 matrix, the preparation method can obviously improve the conductivity; compared with an undoped NiFe2O4 material, the conductivityof the NiFe2O4 conducting material disclosed by the invention is increased by 80% or above; compared with a metal doped NiFe2O4 material, the wettability of the NiFe2O4 conducting material disclosed by the invention is improved, and the aggregation of particles is reduced; and especially, the nano TiN can effectively improve the microstructure of the material, thereby improving the comprehensive mechanical properties of the material.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis based on inert anode materials, in particular to a novel NiFe 2 o 4 Materials and their preparation methods. Background technique [0002] The current aluminum electrolysis process uses carbon materials as the anode, which consumes a large amount of high-quality carbon materials. In addition, the CO, CO produced during the electrolysis process 2 And fluorocarbons, etc., will cause serious environmental pollution, huge energy consumption and environmental load have restricted the sustainable development of the aluminum industry. Aluminum electrolysis technology based on inert anode materials avoids greenhouse gases, CF n As well as the emission of asphalt fume, it has become the focus of attention and research hotspots in the aluminum industry and academia. Among many types of inert anodes, NiFe 2 o 4 Ceramic-based inert anodes have the advantages of high temperature resistance,...

Claims

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Application Information

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IPC IPC(8): C04B35/28C04B35/622C25C3/12
CPCC04B35/2666C04B35/622C04B2235/3886C04B2235/5454C04B2235/656C04B2235/658C04B2235/77C04B2235/96C25C3/12
Inventor 杜金晶王斌方钊李林波胡平
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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