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High temperature resistant molten salt corrosion ceramet anode material and preparation method thereof

A metal-ceramic anode and molten salt corrosion technology, applied in the field of material science, can solve problems such as the need to improve the corrosion resistance of grain boundaries, and achieve the effects of eliminating interconnected pores at grain boundaries, low cost, and simple process

Inactive Publication Date: 2009-11-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of cermet inert anode material and its preparation method that can withstand the corrosion of long-term high-temperature fluoride molten salt, and can ensure the inert anode in aluminum electrolysis run smoothly, solve the problem of existing cermet for aluminum electrolysis Corrosion resistance of inert anode materials, especially the problem that the corrosion resistance of grain boundaries needs to be improved

Method used

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  • High temperature resistant molten salt corrosion ceramet anode material and preparation method thereof
  • High temperature resistant molten salt corrosion ceramet anode material and preparation method thereof
  • High temperature resistant molten salt corrosion ceramet anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: 0.50Yb 2 o 3 -10Cu / (10NiO-NiFe 2 o 4 ) cermet inert anode

[0028] 0.50Yb 2 o 3 -10Cu / (10NiO-NiFe 2 o 4 ) The raw material formula of cermet inert anode is shown in Table 1.

[0029] Table 10.50Yb 2 o 3 -10Cu / (10NiO-NiFe 2 o 4 ) Raw material formula example of cermet inert anode

[0030] raw material

Mass percentage (%)

Yb 2 o 3

0.50

NiO

8.95

NiFe 2 o 4

80.55

Cu

10.00

[0031] Weigh Fe respectively by mass fraction of 61.32% and 38.68% 2 o 3 Powder and NiO powder, the particle size is 1.4μm and 4.1μm, respectively, mixed by ball milling for 2.5h and dried at 100°C, put into corundum crucible, place in a resistance furnace, and calcined at 1200°C for 6h under air atmosphere to obtain NiFe 2 o 4 Spinel ceramic powder, then add NiFe 2 o 4 Spinel, NiO oxide, Cu metal and Yb 2 o 3 Mix the powders together, the particle sizes are 8.1 μm, 4.1 μm, 10 μm and 3.1 μm respec...

Embodiment 2

[0035] Example 2: 0.50Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) cermet inert anode

[0036] 0.50Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) The raw material formulation of the cermet inert anode is shown in Table 2.

[0037] Table 20.50Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) Raw material formula example of cermet inert anode

[0038] raw material

[0039] According to the mass fraction of 61.32% and 38.68%, respectively take the analytically pure Fe 2 o 3 Powder and analytically pure NiO powder, the particle size is 1.4μm and 4.1μm respectively, mixed by ball milling for 2.5h and dried at 100°C, put into a corundum crucible, put in a resistance furnace, and calcined at 1200°C for 6h in an air atmosphere to obtain NiFe 2 o 4 Spinel ceramic powder, then add NiFe 2 o 4 Spinel, NiO oxide, Cu-Ni metal and Yb 2 o 3 The powders are mixed together, the particle sizes are 8.1 μm, 4.1 μm, 12 μm and 3.1 μm respectively, with denatured alcohol as the dispersant and 1wt...

Embodiment 3

[0040] Example 3: 0.25Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) cermet inert anode

[0041] 0.25Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) The raw material formulation of the cermet inert anode is shown in Table 3.

[0042] Table 30.25Yb 2 o 3 -3Ni-12Cu / (10NiO-NiFe 2 o 4 ) Raw material formula example of cermet inert anode

[0043] raw material

[0044] According to the mass fraction of 61.32% and 38.68%, respectively take the analytically pure Fe 2 o 3 Powder and analytically pure NiO powder, the particle size is 1.4μm and 4.1μm respectively, mixed by ball milling for 2.5h and dried at 100°C, put into a corundum crucible, put in a resistance furnace, and calcined at 1200°C for 6h in an air atmosphere to obtain NiFe 2 o 4 Spinel ceramic powder, then add NiFe 2 o 4 Spinel, NiO oxide, Cu-Ni metal and Yb 2 o 3 The powders are mixed together, the particle sizes are 8.1 μm, 4.1 μm, 12 μm and 3.1 μm respectively, with denatured alcohol as the dispersant and 1wt...

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Abstract

The present invention provides a kind of high temperature resistant molten salt corrosion ceramet anode material and a preparation method thereof. The referred ceramet inertness anode material is composed of the following components by weight: 50% to 95% of spinelle type oxide, 1% to 30% of other oxide, 1% to 30% of metal or alloy, and 0.1% to 2% of grain boundary corrosion resistant energizing agent. The raw material is added with a given amount of +3 value lanthanide series rare-earth oxide powder, the rare-earth oxide and a ceramic matrix react with each other during a sintering process to form high temperature resistant molten salt corrosive ferrate new phase along the grain boundary, and simultaneously accelerate the elimination of communication between the grain boundary and breathing holes as well as densification of the sintering material, so as to improve the high temperature resistant molten salt corrosive performance of the material especially the grain boundary region.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a high-temperature molten salt corrosion-resistant cermet anode material and a preparation method thereof. Background technique [0002] At present, cermets are considered to be the most promising to replace carbon anodes as molten salt electrolysis ( One of the inert anode materials such as electrolytic aluminum). In the high-temperature molten salt electrolyte, due to the difference in chemical composition between the grain interface and the interior, as well as the existence of grain boundary impurities or internal stress, it is easy to cause electrolyte penetration, material swelling, cracking and shedding, etc., so it is necessary to take effective methods to strengthen or purify The grain boundary of the cermet material improves its high temperature molten salt corrosion resistance. The current solutions mainly include adjusting the material composition ratio, reducing the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 周科朝何汉兵谭占秋李志友甘雪萍张雷
Owner CENT SOUTH UNIV
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