| Study on Interfacial Bonding State of Ag-Cu in Cold Pressure Welding |
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| 作者姓名： | 李云涛 杜则裕 杨江 |
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| 作者单位： | School of Materials Science and Engineering，School of Materials Science and Engineering，School of Computer Software Science and Engineering Tianjin University，Tianjin 300072，China，Tianjin University，Tianjin 300072，China，Hebei University of Technology，Tianjin 300130，China |
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| 摘 要： | Thetechnologyofcoldpressureweldingiswidelyusedtoachievethejoiningofthesameordifferentmetalswithdif ferentthermal physicspropertiesandotherconditions ,foritsparesenergysources ,simplifiestheweldingequipment,anditdoesnotneedtobeheatedanddoesnotcausethemeltingandtheheateffectzone ,brittlecompounds .Accordinglythetechnologymaybesatisfyingwithdemandforcomprehensivepropertiesinindustry ,andwillsettletheconflictbetweentheincreasingdeficienciesandgrowingdemands .Onthesideofmetallurgicability1] ,thewe…
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Study on Interfacial Bonding State of Ag-Cu in Cold Pressure Welding |
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| LI Yun-tao,DU Ze-yu,YANG Jiang.Study on Interfacial Bonding State of Ag-Cu in Cold Pressure Welding[J].Transactions of Tianjin University,2003,9(3). |
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| Authors: | LI Yun-tao DU Ze-yu YANG Jiang |
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| Institution: | 1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
2. School of Computer Software Science and Engineering, Hebei University of Technology, Tianjin 300130, China |
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| Abstract: | The interfacial bonding of Ag-Cu (they are limited soluble) formed by the technology of cold pressure welding was discussed from the point of metallurgic view in this paper. Meanwhile, tensile test and microscopic test were adopted for studying the state of interfacial bonding, suggesting that the joint of Ag-Cu has not only strong welding joint but also atomic diffusion on the interface. For Ag-Cu, the interaction of dislocation caused by plastic deformation will cause the strain and the vibration of microconstructer defects, accompanied by emitting energy. The energy increases the atomic action and the amplitude of atomic vibration, and the result is that the atom can diffuse to several lattice parameters deep from interface to inner metals. Therefore, under the condition of chemical potential gradient, the special technique, cold pressure welding rather than basic requirements of diffusion should be taken into account. During the cold pressure welding, plastic deformation plays an important role for it causes the metals′ displacement, crystal defects, further activates the surface atoms. Finally, the fracture of atomic bonding leads to the atomic exchange and diffusion between the new metals′ surfaces.In other words the metals Ag,Cu can achieve solidate bonding by cold pressure welding accompanied by the atomic diffusion. Moreover, theoretical analysis and calculation on the basis of thermodynamics, crystallogy, so-lid physics,etc, have been applied to calculate the amount of atomic diffusion, which has further proved the testing results that joint Ag-Cu has strong bonding strength through the mechanism of atomic diffusion. |
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| Keywords: | cold pressure welding interface bonding bonding strength atomic diffusion |
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