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Connection structure of aluminum electrolysis ceramic matrix inert anode and metal guide rod, and preparation thereof

An inert anode and connecting structure technology, which is applied in the field of preparation of the connecting structure, can solve the problems of easy corrosion failure of the connecting interface, poor electrical connection stability, easy falling off of the anode, etc., and achieves low curing shrinkage, good water and oil resistance, and low cost. low cost effect

Inactive Publication Date: 2008-12-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in material properties between oxide ceramics and cermets and metal guide rods, conventional welding techniques cannot be used for the connection between the two. At present, mechanical connections (such as threaded screw connections, spring compression connections) are mostly used. or a combination of the two methods) and diffusion welding to realize the connection between the conductive connecting rod and the inert anode, both of which show problems such as the anode is easy to fall off, the connection interface is easy to corrode and fail, and the stability of the electrical connection is poor.

Method used

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  • Connection structure of aluminum electrolysis ceramic matrix inert anode and metal guide rod, and preparation thereof
  • Connection structure of aluminum electrolysis ceramic matrix inert anode and metal guide rod, and preparation thereof
  • Connection structure of aluminum electrolysis ceramic matrix inert anode and metal guide rod, and preparation thereof

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Embodiment 1

[0029] Such as figure 1 , depicting the schematic diagram of the connection process of the cup-shaped metal inert anode and the metal guide rod. It mainly includes a metal guide rod 1, a first binder 2, a second binder 3, a filling material 4, and a cup-shaped cermet inert anode 5. The composition is NiFe 2 o 4 -10NiO / 17Cu inert anode, conductive rod material is 1Cr18Ni9Ti or high temperature nickel-based alloy. The implementation process of the electrode bonding process is as follows: first, the inner surface of the cup-shaped inert anode 5 and the outer surface of the metal guide rod 1 are decontaminated and degreased, electroless nickel is plated, and the thickness of the coating is 120 μm; 2 o 4 + 25wt% copper powder + 25wt% Ni powder is placed at the bottom of the anode cup, and at the same time, the trapezoidal head of the metal guide rod 1 is partially embedded in the filler to form a filler 4 structure; the composition is 45wt% NiFe 2 o 4 The powder filler of +4...

Embodiment 2

[0031] Such as figure 2 , depicting the schematic diagram of the connection process of the cup-shaped metal inert anode and the metal guide rod. It mainly includes a metal guide rod 1, a first binder 2, and a cup-shaped cermet inert anode 5. The composition is NiFe 2 o 4 -10NiO / 17Ni inert anode, conductive rod material is 1Cr18Ni9Ti or high temperature nickel-based alloy. The implementation process of the electrode bonding process is as follows: first, the inner surface of the cup-shaped cermet inert anode 5 and the outer surface of the metal guide rod 1 are decontaminated and degreased, electroless silver plating is performed, and the thickness of the coating is 20 μm; the composition is 35wt%NiFe 2 o 4 +45wt% silver-copper alloy powder+15wt% CuO+5wt% ZrO 2 Mix the powder filling material with a solid-to-liquid ratio of 0.6 and a phosphate solution with a mass concentration of 70%, and then fill it into the anode cup to form a binder 2, and at the same time, partially e...

Embodiment 3

[0033] image 3 It is a schematic diagram of a cylindrical or square inert anode connection process, mainly including a metal guide rod 1, a first binder 2, and a cylindrical or square inert anode 6. The composition is NiFe 2 o 4 -10NiO / 17Cu inert anode, conductive rod material is Cr18Ni9Ti. The implementation process of the bonding process of the electrode is as follows: first, the outer surface of the cylindrical or square inert anode 6 and the metal guide rod 1 is decontaminated and degreased, and the surface to be connected of the cylindrical or square inert anode 6 and the outer surface of the metal guide rod 1 The surface is electroplated with copper, the thickness of the coating is 200 μm, and then the composition is 45wt% NiFe 2 o 4 +40wt%Cu+5wt%Ag+10wt%CuO powder filler is injected into a phosphate solution with a solid-to-liquid ratio of 0.3 and a mass concentration of 60%. After uniform mixing, it is coated on the surface of the anode to be connected, and then t...

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Abstract

The invention discloses a connecting structure of an aluminium electrolysis ceramic based inert anode and a metal guide bar and a preparation method thereof. The ceramic based inert anode and the metal guide bar are connected by adopting a caking agent which consists of a filling material and a phosphate solution. The stable electricity conductive connection of the inert anode and the metal guide bar is realized by adopting the appropriate curing technology. The connecting structure has a connecting intensity more than between 5MPa and 20MPa, can stand severe hit of heat, electricity and hot aggressive gas for a long time, and can bear the current density with 0 to 10A / cm<2> for a long time.

Description

technical field [0001] The invention relates to a high-strength conductive connection structure of a ceramic-based or cermet-based inert anode for aluminum electrolysis and a metal guide rod, and also relates to a preparation method of the connection structure. Background technique [0002] Inert anode technology can reduce the cost of electrolytic aluminum production, save energy and increase production, and is environmentally friendly. Its research and development and application will bring about a technological revolution in the traditional aluminum electrolysis industry. Cermets have become the most promising inert anode materials to replace the current carbon anodes due to their good resistance to fluoride molten salt corrosion of ceramic materials and excellent electrical conductivity of metal materials. The aluminum electrolysis process occurs in fluoride molten salt above 900°C. When an inert anode is used, the current is drawn out through the anode busbar, and is co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 张雷周科朝李志友
Owner CENT SOUTH UNIV
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