Silver nanoparticle-assisted diffusion brazing of 3003 Al alloy for microchannel applications

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• 作者：Ravi Eluri ; ^{elurir@onid.orst.edu} ; Brian K. Paul
• 关键词：Diffusion ; Brazing ; Microstructure
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：April, 2012
• 卷：36
• 期：Complete
• 页码：13-23
• 文件大小：2752 K

摘要

In the current study, we investigated the effect of braze filler particle size and various processing parameters on vacuum diffusion brazing of thin foils of 3003 Al using a Ag nanoparticle (AgNPs) interlayer. All samples were brazed at 550 掳C and 570 掳C at heating rates of 5 掳C/min and 25 掳C/min under a pressure of 1 MPa. Differential scanning calorimetric results, involving 5 nm AgNPs, showed significant reduction in phase transformation temperature. Microstructures of brazed cross-sections revealed that nanoparticles aid formation of the joint at temperatures below the Al-Ag eutectic temperature of 567 掳C. X-ray diffraction analysis of the interface showed the presence of 未-phase (Ag₂Al) and 渭-phase (Ag₃Al). This was confirmed with energy dispersive spectroscopic analysis. A tensile strength of 69.7 MPa was achieved for a sample brazed at 570 掳C with an interlayer of approximately 7 渭m in thickness.