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Sökning: WFRF:(Liu Johan 1960) > (2005-2009)

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  • Andersson, Cristina, 1969, et al. (författare)
  • Characterization of Mechanical Properties of Eutectic Sn-Co-Cu Lead Free Alloy
  • 2006
  • Ingår i: Proceedings of the 1st IEEE CPMT Electronics Systemintegration Technology Conference (ESTC2006), September 5-7, 2006, Dresden, Germany. ; , s. 152-160
  • Konferensbidrag (refereegranskat)abstract
    • The Sn-Co-Cu eutectic solder alloy is a less expensive and is therefore a possible alternative to the Sn-Ag-Cu alloys. The Sn-Co-Cu system eutectic composition was obtained by means of CALPHAD (CALculation of PHAse Diagram) methodology. The composition of the Sn-rich, eutectic Sn-Co-Cu system was found to be 0.4%Co and 0.7%Cu (wt%) with a melting point of 224°C. The tensile behavior of the eutectic Sn-0.4Co-0.7Cu bulk samples was studied under three different conditions of strain rates (10 -6 , 10 -4 and 10 -3 /s) and compared to both Sn-37Pb and Sn-4.0Ag-0.5Cu alloys. The evaluation of the tensile results showed that the effect of strain rate played an important roll on the tensile properties of these alloys, and it is clearly observed that the tensile strength increases as the strain rate increases. Furthermore, Sn-4.0Ag-0.5Cu alloy shows better Ultimate Tensile Strength (UTS) followed by Sn-37P and Sn-0.4Co-0.7Cu system. © 2006 IEEE.
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  • Chen, Liu, 1973, et al. (författare)
  • Reliability Investigation for Encapsulated Isotropic Conductive Adhesives Flip Chip Interconnection
  • 2006
  • Ingår i: Journal of Electronic Packaging, Transactions of the ASME. - 1528-9044 .- 1043-7398. ; 128:3, s. 177-183
  • Tidskriftsartikel (refereegranskat)abstract
    • Isotropic conductive adhesives (ICA) are gaining more and more application interests in electronic manufacturing, however, their failure mechanism is not been fully understood. In this paper we present reliability investigations on an encapsulated ICA flip chip interconnection. Experimental work included product lifetime measurement, cross section observation, and whole module warpage scanning. Results revealed that the chip-size effect on the ICA lifetime was obvious. A theoretical analysis was conducted with Finite Element Method (FEM) simulation. Viscoelastic models for adhesives and underfill materials were employed, and the comparison with an elastic model was made. Calculated equivalent stresses S eqv and shear stress σ xy fitted well with the experimental lifetime measurement, thus a lifetime relationship similar to the Coffin-Manson formula was established to predict the thermal fatigue life of an encapsulated ICA flip chip. Furthermore, the influences of underfill properties on the ICA reliability were discussed. Copyright © 2006 by ASME.
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  • Liu, Johan, 1960, et al. (författare)
  • Stem Cell Growth and Migration on Nanofibrous Polymer Scaffolds and Micro-Fluidic Channels on Silicon-Chip
  • 2009
  • Ingår i: Proceedings of the 2009 Electronic Components and Technology Conference. - 0569-5503. ; , s. 1080-1085
  • Konferensbidrag (refereegranskat)abstract
    • Stem cell growth and migration on nanofibrous scaffolds and micro-fluidic channels on Silicon-Chip were studied by using neural stem cells isolated from adult rats' brain. Electrospinning and lithographic technique were used for developing nanofibrous-polylactic acid (PLA) and polyurethane (PU) based-scaffolds and micro-fluidic channels on Si-Chips respectively. Immunocytochemical and morphological analysis showed better cell-matrix interaction with profound adhesion, proliferation and migration on the developed scaffolds. Cell culture assay with microfluidic channel revealed the ability of developed channel system in guiding neuronal stem cell growth towards specified directions. These studies extend the possibility of using developed nanofibrous scaffolds and micro-fluidic channel system for future electrical signal transmission based on living neural stem cells.
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