Diffusion behavior of silicon at interface ofAl clad sheet and joint formation
来源期刊：中国有色金属学报(英文版)2003年第z1期
论文作者：Dusan P. Sekulic GAO Feng(高 峰) QIAN Yi-yu (钱乙余) ZHAO Hui(赵 惠)
文章页码：9 - 13
Key words：residue clad; diffusion coefficient; aluminum alloy; brazed joint formation
Abstract: The diffusion behavior of silicon in the brazing clad sheet was studied. It is interesting to notice that the residue clad appears after the brazing process, regardless of the brazing conditions. Diffusion coefficients of silicon during its migration across the clad-core interface of an Al brazing sheet, both prior to brazing temperature and at the peak brazing temperature, are determined directly from EPMA (electron probe microanalysis) scans at different locations along the cladding sheet and within the joint zone. Subsequently, the diffusion coefficients were used to predict the residue clad layer formation during brazing. Migration of silicon during brazing depends, in addition to material characteristics and process parameters, on the vicinity of the joint zone. From the analysis of the residue clad layer, the joint topology could be predicted based on the minimum potential energy principle. The deduced results may be utilized to study the thermal integrate of brazed joint.
Dusan P. Sekulic2,GAO Feng(高 峰)1,2, QIAN Yi-yu (钱乙余)1, ZHAO Hui(赵 惠)2
(1. State Key Laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China;
2. Center for Robotics and Manufacturing Systems,
University of Kentucky, Lexington, KY 40506, USA)
Abstract:The diffusion behavior of silicon in the brazing clad sheet was studied. It is interesting to notice that the residue clad appears after the brazing process, regardless of the brazing conditions. Diffusion coefficients of silicon during its migration across the clad-core interface of an Al brazing sheet, both prior to brazing temperature and at the peak brazing temperature, are determined directly from EPMA (electron probe microanalysis) scans at different locations along the cladding sheet and within the joint zone. Subsequently, the diffusion coefficients were used to predict the residue clad layer formation during brazing. Migration of silicon during brazing depends, in addition to material characteristics and process parameters, on the vicinity of the joint zone. From the analysis of the residue clad layer, the joint topology could be predicted based on the minimum potential energy principle. The deduced results may be utilized to study the thermal integrate of brazed joint.
Key words:residue clad; diffusion coefficient; aluminum alloy; brazed joint formation
