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Sn-3.0Ag-0.5Cu Nanocomposite Solder Reinforced With Bi2Te3 Nanoparticles

Si Chen (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; Xin Luo (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; Di Jiang (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; L. L. Ye ; Michael Edwards (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; Johan Liu (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem)
Ieee Transactions on Components Packaging and Manufacturing Technology (2156-3950). Vol. 5 (2015), 8, p. 1186-1196.
[Artikel, refereegranskad vetenskaplig]

Nanocomposite solders are regarded as one of the most promising interconnect materials for the high-density electronic packaging due to their high mechanical strength and fine microstructure. However, the developments of nanocomposite solders have been limited by the inadequate compatibility between nanoparticles and solder matrix with respect to density, hardness, coefficient of thermal expansion, and surface activity. The compatibility issue will lead to a huge loss of nanoparticles from the solder matrix after the reflow soldering process. The thermal fatigue resistance of solder joint will also become degraded. Therefore, aiming to solve this problem, a novel nanocomposite solder consisting of Bi2Te3 semiconductor nanoparticles and Sn-3.0Ag-0.5Cu (SAC305) solder is presented. The effect of nanoparticles on the viscosity of solder paste and the void content of solder bump was first studied. Then, a series of analysis on the composition and microstructure of the solder bump were completed using transmission electron microscopy, X-ray diffraction, inductively coupled plasma-mass spectrometry, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The survival rate of nanoparticles in the solder bump after reflow soldering process reaches as high as 80%. The refined microstructure was observed from the cross section of the nanocomposite solders. The shear test showed that the average mechanical strength of SAC305 solder after the addition of Bi2Te3 nanoparticles was higher. Meanwhile, no thermal fatigue resistance degradation was detected in the nanocomposite solder after 1000 thermal cycles in the range of -40 degrees C to 115 degrees C.

Nyckelord: Nanocomposite solders, Bi2Te3 nanoparticles, Sn-3.0Ag-0.5Cu



Denna post skapades 2015-09-15. Senast ändrad 2016-07-01.
CPL Pubid: 222508

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Bionanosystem (2007-2015)

Ämnesområden

Nanoteknik

Chalmers infrastruktur