Mallik, S., Ekere, N.N., Durairaj, R., Marks, A.E. and Seman, A. (2009) Wall-slip effects in SnAgCu solder pastes used in electronics assembly applications. Materials & Design, 30 (10). pp. 4502-4506. ISSN 0261-3069 (doi:10.1016/j.matdes.2009.05.028)

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Abstract

Solder paste is the most important strategic bonding material used in the assembly of surface mount components in electronics manufacturing. As the trend towards miniaturisation of electronic products continues, there is an increasing demand for better understanding of the flow and deformation that is, the rheological behaviour of solder paste formulations. Wall slip plays an important role in characterising the flow behaviour of solder paste materials. The problem of wall slip arises due to the various attractive and repulsive forces acting between the solder particles and the walls of the measuring geometry. These interactions could lead to the presence of a thin solvent layer adjacent to the wall, which gives rise to slippage. In rheological measurements, slip effects can generally be avoided by using roughened surfaces for measuring geometries. In this paper, a novel technique is developed to study the effect of wall slip in the rheological measurements of lead-free solder paste. The viscosity and oscillatory data obtained for three different solder paste samples (from measuring geometries of different surface roughness) havebeen analysed and compared. In viscosity measurements, slip effects were dominant at low shear rates and the use of serrated surfaces was found to be quite effective in minimizing slip effects. Oscillatory measurements were also affected by roughening the surfaces of measuring geometries.

Item Type:	Article
Additional Information:	[1] First available online: 21 May 2009.
Uncontrolled Keywords:	wall-slip effects, solder pastes, electronics assembly applications
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Pre-2014 Departments:	School of Engineering School of Engineering > Department of Engineering Systems School of Engineering > Manufacturing Engineering Research Group
Related URLs:	Publisher Organisation
Last Modified:	19 Dec 2019 15:48
URI:	http://gala.gre.ac.uk/id/eprint/1615

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