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Method for improving interfacial bond strength of copper/aluminum cold rolling composite ultrathin strip

An interface bonding strength, ultra-thin technology, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of low plasticity and broken strips of composite thin strips, and achieve the effects of improving plasticity reserve, accelerating diffusion speed and reducing average size.

Inactive Publication Date: 2013-03-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For ultra-thin composite strips with a thickness below 0.15 mm, the interface has a more significant impact on the properties (mainly plasticity) of the composite material. In the research of implementing heat treatment to improve the interface strength, people's existing technology is only limited to Conventional heat treatment methods, however, many problems at the interface of composite materials, such as the control of the interface morphology after compounding, the inhibition of the interface compound, the relationship between the interface and the structure and properties of the composite strip, the recovery of the matrix, and the recrystallization problem. Conventional heat treatment technology is not enough to solve the problem, which makes the composite thin strip easy to break due to low plasticity during use, which poses a huge obstacle to the application of copper-aluminum cold-rolled composite thin strip

Method used

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  • Method for improving interfacial bond strength of copper/aluminum cold rolling composite ultrathin strip
  • Method for improving interfacial bond strength of copper/aluminum cold rolling composite ultrathin strip
  • Method for improving interfacial bond strength of copper/aluminum cold rolling composite ultrathin strip

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Effect test

Embodiment 1

[0027] Magnetic field heat treatment process of 0.12mm ultra-thin copper / aluminum cold-rolled composite strip

[0028] Use MVH-30 strong magnetic field heating furnace for annealing treatment. During heat treatment, cut the compounded composite tape into small pieces of 3.4cm×1cm, put the sample into a graphite crucible, and apply a positive magnetic field from 0T to 0.5 T, and then start to heat the sample. After rising to 380°C at a heating rate of 5°C / s, keep it at 380±3°C for 5 minutes, then start to cool down, and cool to room temperature at an average cooling rate of 15°C / min. When the temperature drops to room temperature, reduce the magnetic field strength to 0T, and take out the sample.

[0029] image 3 The surface electron micrographs of the 0.12mm ultra-thin composite tape interface without applying a magnetic field (a), applying a positive magnetic field (b) and applying a negative magnetic field (c). Although metal copper and aluminum are non-magnetic materials...

Embodiment 2

[0035] Magnetic field heat treatment process of 0.10mm ultra-thin copper / aluminum cold-rolled composite strip

[0036] Use MVH-30 strong magnetic field heating furnace for annealing treatment. During heat treatment, cut the compounded composite tape into small pieces of 3.4cm×1cm, put the sample into a graphite crucible, and apply a positive magnetic field from 0T to 0.01 T, then start to heat the sample, after raising the temperature up to 350°C at a heating rate of 8°C / s, keep it at 350±3°C for 10 minutes, then start to cool down, and cool it to room temperature at an average cooling rate of 10°C / min. When the temperature drops to room temperature, reduce the magnetic field strength to 0T, and take out the sample. The average size of the composite interface of the obtained sample is 1.1 μm, the shear strength is 98 MPa, the copper layer and the aluminum layer are completely recrystallized, and the type of interface compound is Al 2 Cu, AlCu, Al 4 Cu 9 , The yield strength...

Embodiment 3

[0038] Magnetic field heat treatment process of 0.15mm ultra-thin copper / aluminum cold-rolled composite strip

[0039] Use MVH-30 strong magnetic field heating furnace for annealing treatment. During heat treatment, cut the compounded composite tape into small pieces of 3.4cm×1cm, put the sample into a graphite crucible, and apply a positive magnetic field from 0T to 6T , and then start to heat the sample. After rising to 450°C at a heating rate of 10°C / s, keep it at 450±3°C for 30 minutes, then start to cool down, and cool to room temperature at an average cooling rate of 20°C / min. When it is down to room temperature, reduce the magnetic field intensity to 0T, and take out the sample. The average size of the composite interface of the obtained sample is 1.3 μm, the shear strength is 102 MPa, the copper layer and the aluminum layer are completely recrystallized, and the type of interface compound is Al 2 Cu, AlCu, Al 4 Cu 9 , The yield strength of the composite tape is 79MP...

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Abstract

The invention belongs to the technical field of processing of metal materials, and particularly relates to a method for improving interfacial bond strength of a copper / aluminum cold rolling composite ultrathin strip. The method comprises the following steps in sequence: thermally processing 0.1 to 0.15mm of ultrathin copper / aluminum cold rolling composite ultrathin strip; applying the a positive magnetic field, and increasing the strength of the positive magnetic field from 0 to 0.01-6T; heating a sample until reaching 350 to 450 DEG C at temperature increase rate of 5 to 10 DEG C per second; maintaining the temperature for 5 to 30 minutes; cooling to reach room temperature; reducing the strength of the magnetic field to reach 0T; and then taking out the sample. According to the method, the electromagnetic field is applied during thermally processing the copper / aluminum cold rolling ultrathin composite strip, the average dimension of a sample interface layer is reduced, the shear strength is improved, the yield ratio is reduced, the plasticity index-elongation is greatly improved, and the interfacial bond strength of the copper / aluminum cold rolling composite ultrathin strip is improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of metal material processing, and in particular relates to a method for improving the interface bonding strength of copper / aluminum cold-rolled composite ultra-thin strips. Background technique [0003] With the modern industry's higher and higher performance requirements for metal materials and stronger requirements for the improvement of material structure, a single metal material can no longer meet these needs. Therefore, integrating the physical, chemical, mechanical properties and prices of different materials New composite materials that are different from one another have emerged at the historic moment, which will make more effective use of the characteristics of materials, overcome and make up for the lack of performance of a single material, so as to obtain new materials with more excellent comprehensive properties. Therefore, the development and preparation of these new materials with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/04C21D9/52
Inventor 王平刘静
Owner NORTHEASTERN UNIV
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