Paper Title:
The Correlation between the Liquid Structure and the Viscosity of Sn-Cu Lead-Free Solders
  Abstract

The liquid structure of two lead-free solder Molten alloys, Sn-0.5Cu and Sn-1.8Cu (wt.%), has been examined using X-ray diffraction method. The main peak for liquid structure of Sn-0.5Cu is similar to that of pure Sn. A pre-peak has been found in the low Q part on the structure factor S(Q) of Sn-1.8Cu tested under 320°C, but it disappeared finally when the testing temperature reached 350°C. The both viscosity was measured using a torsional oscillation viscometer. It was found that the anomalous variations of viscosity had a direct relation with the transition of the liquid structure, which is consonant with the results of high temperature X-ray diffraction. The microstructure of the solder matrixes as well as interfacial reaction between liquid solders and Cu substrates was also studied. The results show that particle-like Cu6Sn5 intermetallic compounds (IMCs) emerge in Sn-1.8Cu solder matrix. The IMC layer at Sn-1.8Cu/Cu joint is thicker than that at Sn-0.5Cu/Cu interface. The correlative effect of liquid structure on phase evolution in the solder joints is analyzed.

  Info
Periodical
Advanced Materials Research (Volumes 97-101)
Edited by
Zhengyi Jiang and Chunliang Zhang
Pages
679-682
DOI
10.4028/www.scientific.net/AMR.97-101.679
Citation
X. M. Pan, N. Zhao, R. F. Ding, G. L. Wei, L. Wang, "The Correlation between the Liquid Structure and the Viscosity of Sn-Cu Lead-Free Solders", Advanced Materials Research, Vols. 97-101, pp. 679-682, 2010
Online since
March 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Keisuke Uenishi, Kojiro F. Kobayashi
Abstract:The microstructure and strength for the micro joints of Pb free Sn-Ag based solders with Au/Ni alloy platings were investigated. For the...
411
Authors: Zhi Bo Yang, Jiu Hua Xu, Ai Ju Liu
Abstract:Brazing diamond grits onto steel substrate using a Ni-based filler alloy was carried out via laser beam in an argon atmosphere. The...
3879
Authors: Mitsuhiro Watanabe, Shinji Kumai
Abstract:Magnetic pulse welding was applied to the lap joining of similar (Al/Al) and dissimilar materials (Al/Fe, Al/Cu, and Al/Ni). The magnetic...
755
Authors: Zhi Bo Yang, Ai Ju Liu, Jiu Hua Xu
Abstract:Brazing diamond wheel was carried out via laser in an argon atmosphere. The interfacial microstructures among brazed diamond, the filler...
218
Authors: Qi Ping Kang, Xin Bo He, Shu Bin Ren, Bao Rui Jia, Xuan Hui Qu
Chapter 8: Composites, Polymers and Biomaterials
Abstract:TiC intermediate layers were formed on the surface of diamond particle with reaction of Ti powders in mixed molten NaCl-KCl salts. The...
1610