Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for connecting metal ceramic inert anode for aluminum electrolysis with metal conducting rod

An inert anode and metal conductive technology, which is applied in the field of aluminum electrolysis, can solve the problems of corrosion failure at the connection point, electrical connection stability, cracks in ceramic materials, and difficulty in interdiffusion of elements, etc., to achieve good high temperature oxidation resistance and small resistance voltage drop , The effect of shortening the process flow

Active Publication Date: 2018-07-27
NORTHEASTERN UNIV
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for connecting metal ceramic inert anode for aluminum electrolysis with metal conducting rod

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

A method for connecting a metal ceramic inert anode for aluminum electrolysis with a metal conducting rod comprises the following steps that (1) the NiFe2O4 base metal ceramic inert anode is presintered at the temperature of 900-1000 DEG C, and then a hole is drilled in the surface of the NiFe2O4 base metal ceramic inert anode; (2) the metal conducting rod is put into the hole, and a filling material is placed into the hole and tamped; and (3) the NiFe2O4 base metal ceramic inert anode and the metal conducting rod are heated to 1100-1200 DEG C under the protective atmosphere condition, subjected to heat preservation and cooled along with a furnace. According to the method, a transition layer can be formed between the inert anode and the metal conducting rod, the enough high-temperature strength and electrical conductivity are achieved, in addition, the enough expansion space can be provided for the metal conducting rod and the anode, and the situation that the metal conducting rod is subjected to thermal expansion, and the anode is burst is avoided.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com