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Method for connecting ceramic-base inert anode used for aluminum electrolysis and metal conducting bar

An inert anode, metal conductive technology, applied in the field of stable connection between ceramic base inert anode and metal conductive rod for aluminum electrolysis, can solve the problems of poor electrical connection stability, inability to use, easy corrosion failure of the connection interface, etc., to achieve the effect of stable connection

Inactive Publication Date: 2010-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for connecting ceramic-base inert anode used for aluminum electrolysis and metal conducting bar
  • Method for connecting ceramic-base inert anode used for aluminum electrolysis and metal conducting bar
  • Method for connecting ceramic-base inert anode used for aluminum electrolysis and metal conducting bar

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Embodiment 1

[0022] Such as figure 1 , Describes the schematic diagram of the connection process between the cup-shaped inert anode and the conductive rod. It mainly includes indenter 1, conductive rod 2, solder 3, and cup-shaped inert anode 4. The composition is NiFe 2 O 4 -10NiO / 17Ni inert anode, conductive rod material is Cr12MoV. The process of pressure diffusion welding is as follows: First, the inner surface of the cup-shaped inert anode and the outer surface of the conductive connecting rod are electrolessly plated with nickel, the thickness of the plating layer is about 120μm, and then the composition is 50wt% NiFe 2 O 4 The powder solder of +25wt%Ni+25wt%Cu is filled into the anode cup, and then the conductive rod is buried in the solder powder, and finally the indenter is placed above the solder powder to complete the assembly work. The above assembly mechanism is placed in a hot pressing furnace, the electric furnace is closed and the system is vacuumed, and when the vacuum reach...

Embodiment 2

[0024] image 3 A schematic diagram of the connection process of a cylindrical or square inert anode, which mainly includes an indenter 1, a conductive rod 2, a solder 3, and a cylindrical or square inert anode 4. The composition is NiFe 2 O 4 -10NiO / 17Cu inert anode, conductive rod material is Cr18Ni9Ti. The process of pressure diffusion welding is as follows: First, the to-be-connected surface of the inert anode and the outer surface of the conductive connecting rod are electroplated with copper, the plating thickness is about 150μm, and then the composition is 62wt% NiFe 2 O 4 -10NiO / 17Cu+38wt%Cu powder solder is spread on the surface of the anode to be connected, and a powder fixing device is added if necessary to ensure the thickness and shape of the solder layer, and then the conductive rod is buried in the solder powder , And finally put the indenter above the solder powder to complete the assembly work. The above assembly structure is placed in an electric furnace, the...

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Abstract

The invention relates to a connection method of a ceramics matrix inert anode used for the aluminum electrolysis and a metal electric conducting rod. Aiming at different appearances and sizes of the ceramics matrix inert anode used for the aluminum electrolysis, the invention provides a processing technical method used for the stable connection method of the anode and the metal electric conducting rod. The method realizes the high strength stable connection between the ceramics matrix inert anode and the metal electric conducting rod through the metallisation processing of the pre-connecting surface of the inert anode and the outer surface of the electric conducting rod, and the process of solder with components near to the components of an inert anode matrix and the pressure diffusion welding, a connection structure has 20 MPa connection strength, and the connection structure can endure the impact of long-term intense heat, electricity and hot corrosive gas, and can bear 0-10 A / cm <2> current density.

Description

Technical field [0001] The invention relates to aluminum electrolysis and inert anodes for aluminum electrolysis, and particularly relates to a process technology method for the ceramic-based inert anodes for aluminum electrolysis and metal conductive rods to be firmly connected. Background technique [0002] The use of inert anodes to replace existing carbon anodes is the development trend of modern aluminum electrolysis. The aluminum electrolysis process takes place in fluoride molten salt above 900°C. When using an inert anode, the current is drawn through the anode bus bar, and is connected to the anode through the wire and the anode conductive connecting rod. The connecting part of the anode conductive connecting rod and the inert anode is not only It must have high high-temperature connection strength and excellent electrical conductivity, as well as good resistance to oxidation corrosion, hot-corrosive gas corrosion, and excellent high-temperature creep resistance. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/16C25C3/12
Inventor 周科朝李志友张雷李劼赖延清张晓泳
Owner CENT SOUTH UNIV
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