A method for connecting a metal-ceramic inert anode to a metal conductive rod for aluminum electrolysis

An inert anode, metal conductive technology, applied in the field of aluminum electrolysis, can solve the problems of corrosion failure of the joint, electrical connection stability, difficulty in mutual diffusion of elements, cracks in ceramic materials, etc., to achieve good high temperature oxidation resistance, shorten the process flow, The effect of small resistance voltage drop

Active Publication Date: 2020-01-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many connection methods between ceramic materials and metals and their alloys. The commonly used methods are mechanical connection, brazing connection, instantaneous liquid phase connection, solid phase diffusion connection and welding connection, etc.; the connection between nickel ferrite ceramic substrate and metal conductive rod There is a large difference in material properties between the two, the interdiffusion of elements is difficult, the disparity in the thermal expansion coefficient of ceramics and metals, the large thermal stress at the joint, and the cracks in the ceramic material are easy to occur; therefore, the use of conventional connection technology is prone to anode support Problems such as cracking and falling off, corrosion failure at the connection and poor stability of the electrical connection

Method used

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  • A method for connecting a metal-ceramic inert anode to a metal conductive rod for aluminum electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] NiFe used 2 o 4 The base cermet inert anode is composed of a ceramic phase and a metal phase, and the composition of the ceramic phase contains NiO 17% by mass percentage, and the rest is NiFe 2 o 4 ; The composition of the metal phase is 80Cu-15Ni-5Ag; the mass ratio of the metal phase to the ceramic phase is 17:83;

[0026] The material of the metal conductive rod is 2520 stainless steel;

[0027] The composition of the filler used is by mass percentage: NiFe 2 o 4 50% of ceramic particles, 10% of TiN nano powder, and 40% of metal powder; the metal powder is 60Cu-30Ni-10Ag mixed metal powder with a particle size of ≤100 μm; the NiFe 2 o 4 The particle size of the ceramic particles is ≤74 μm; the particle size of the TiN nano powder is 40-80 nm;

[0028] NiFe 2 o 4 The base cermet inert anode was pre-sintered at 900 °C for 6 hours, cooled to room temperature, and then in NiFe 2 o 4 Drilling holes on the inert positive surface of the base cermet;

[0029] Pu...

Embodiment 2

[0032] Method is with embodiment 1, and difference is:

[0033] (1) NiFe used 2 o 4 The base cermet inert anode does not contain NiO 4 ; The composition of the metal phase is 85Cu-15Ni; the mass ratio of the metal phase to the ceramic phase is 10:90;

[0034] (2) The material of the metal conductive rod is 80Ni-20Cr nickel-based superalloy;

[0035] (3) The composition of the filler used is by mass percentage: NiFe 2 o 4Ceramic particles 65%, TiN nano powder 25%, metal powder 10%; the metal powder is 80Cu-20Ni mixed metal powder;

[0036] (4) NiFe 2 o 4 The base cermet inert anode was pre-sintered at 1000°C for 5 hours;

[0037] (5) Metal conductive rod and NiFe 2 o 4 The minimum distance between base cermet inert anodes is 12.5mm;

[0038] (6) The connection structure material is kept at 1200° C. for 4 hours, and the oxygen partial pressure under the protective atmosphere is 50 Pa.

Embodiment 3

[0040] Method is with embodiment 1, and difference is:

[0041] (1) NiFe used 2 o 4 The composition of the ceramic phase in the base cermet inert anode contains NiO10% by mass percentage, and the rest is NiFe 2 o 4 ; The composition of the metal phase is 82.5Cu-15Ni-2.5Ag; the mass ratio of the metal phase to the ceramic phase is 14:86;

[0042] (2) The material of the metal conductive rod is K640 cobalt-based superalloy;

[0043] (3) The composition of the filler used is by mass percentage: NiFe 2 o 4 57% of ceramic particles, 18% of TiN nano powder, and 25% of metal powder; the metal powder is 70Cu-25Ni-5Ag mixed metal powder;

[0044] (4) NiFe 2 o 4 The base cermet inert anode was pre-sintered at 950°C for 4 hours;

[0045] (5) Metal conductive rod and NiFe 2 o 4 The minimum distance between base cermet inert anodes is 20mm;

[0046] (6) The connection structure material is kept at 1150° C. for 5 hours, and the oxygen partial pressure under the protective atmosp...

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Abstract

A method for connecting a cermet inert anode to a metal conductive rod for aluminum electrolysis, comprising the following steps: (1) NiFe 2 o 4 The base cermet inert anode is pre-sintered at 900-1000 °C, and then the surface is drilled; (2) Put the metal conductive rod into the hole, and place the filler for compaction; (3) Heat it to 1100-1200 °C under the condition of protective atmosphere ℃ heat preservation, cooling with the furnace. The method of the present invention can form a transition layer between the inert anode and the metal conductive rod, has sufficient high-temperature strength and electrical conductivity, and can provide sufficient expansion space for the metal conductive rod and the anode, so as to prevent the metal conductive rod from thermally expanding and cracking the anode .

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to a method for connecting a metal ceramic inert anode and a metal conductive rod for aluminum electrolysis. Background technique [0002] Traditional Hall-Héroult aluminum electrolytic cells have problems such as high carbon consumption and serious environmental pollution due to the use of consumable carbon anodes. Inert anodes can overcome the above problems and become the development trend of modern aluminum electrolysis; NiFe 2 o 4 cermet-based inert anode with NiFe 2 o 4 The ceramic phase has the advantages of good high temperature chemical stability, strong resistance to molten salt corrosion, good electrical conductivity and thermal shock resistance of the metal phase, and is considered to be the most promising inert anode material for aluminum electrolysis. [0003] When using inert anode electrolysis, one end of the inert anode material is conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
CPCC25C3/12
Inventor 张志刚马俊飞卢晓通徐建荣曹卓坤罗洪杰刘宜汉
Owner NORTHEASTERN UNIV LIAONING
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