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Tsao, L C
Journal of materials science. Materials in electronics, 01/2014, Volume: 25, Issue: 1Journal Article
In this study, a micro-porous titania (TiO sub(2)) layer was synthesized on commercial pure Ti using the microplasma oxidation (MPO) method. Ti/Ti, MPO-TiO sub(2) (MPO-Ti)/Ti and MPO-Ti/MPO-Ti were successfully active soldered using this Sn3.5Ag4Ti(Ce) active filler metal at 250 degree C for 60 s. The microstructure and mechanical properties of the active soldered joints were investigated. Results indicate that trace Ce reacts with the MPO-Ti layer to form both CeO sub(2) and Ti, corresponding to the reaction between Ti and Sn to form Ti sub(6)Sn sub(5), and nano-sizes Ag sub(3)Sn phases adsorb at the active filler/MPO-Ti interfaces. Shear strength of soldered Ti/Ti, MPO-Ti/Ti, and MPO-Ti/MPO-Ti specimens were measured to be 16.3 plus or minus 1.39, 11.3 plus or minus 1.56, and 9.5 plus or minus 1.24 MPa, respectively. The fracture of Ti/Ti specimen was found to produce along the Ti sub(2)Sn sub(3) and solder matrix. In the MPO-Ti/MPO-Ti specimen, the fractures occurred through the active filler/MPO-Ti interface. In the MPO-Ti/Ti specimen, the fracture failure mode transferred from MPO layer/Ti interfacial fracture to fracture within the active filler.
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