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• W2156282960 abstract "A fluxless bonding process using either indium-silver or tin-copper multilayer composite to produce high temperature joints at relatively low temperature has been developed. The process temperatures for indium-silver and tin-copper system are 210/spl deg/C and 280/spl deg/C, respectively. Joints, which are almost void-free, with melting temperatures of 210/spl deg/C and 415/spl deg/C, respectively, are made. After further annealing at 150/spl deg/C for In-Ag and 280/spl deg/C for Sn-Cu, the re-melting temperature of the joints increases to above 700/spl deg/C. The technique, thus, provides a quantum jump to the post-processing temperature of component fabrication. In either process, the joints are examined using a scanning acoustic microscope to confirm the bonding quality. The joint cross-sections are studied using SEM and EDX to find the microstructure and composition. Upon deposition, In interacts with Ag to become In-AgIn/sub 2/ composite, and Sn interacts with Cu to become Sn-Cu/sub 6/Sns composite. The intermetallic compounds AgIn/sub 2/ and Cu/sub 6/SnS prevent the In and Sn layers from oxidation in atmosphere. Thus no flux is needed. Besides the fluxless feature, the low process temperature would significantly reduce the stresses developed due to thermal expansion mismatch comparing to the otherwise high temperature processes with temperature exceeding the melting temperature. The multilayer bonding method also facilitates precise control of the alloy composition and the joint thickness. The new technique should find applications in the emergent high temperature electronic devices." @default.
• W2156282960 created "2016-06-24" @default.
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• W2156282960 date "2002-11-27" @default.
• W2156282960 modified "2023-09-26" @default.
• W2156282960 title "High temperature joints manufactured at low temperature" @default.
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• W2156282960 doi "https://doi.org/10.1109/ectc.1998.678707" @default.
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