Seman, Anton, Ekere, Ndy, Ashenden, Stuart J., Mallik, Sabuj, Marks, Antony and Durairaj, Rajkumar (2008) In-situ non-destructive ultrasonic rheology technique for monitoring different lead-free solder pastes for surface mount applications. 2008 10th Electronics Packaging Technology Conference (EPTC 2008). Institute of Electrical and Electronics Engineers, New York, USA, pp. 1448-1454. ISBN 9781424421176 (doi:https://doi.org/10.1109/EPTC.2008.4763635)

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Abstract

This paper investigates the application of a non-destructive ultrasonic technique for characterising the rheological properties of solder paste through the use of through-mode microsecond ultrasonic pulses for evaluation of viscoelastic properties of lead-free solder paste containing different types of flux. Ultrasonic techniques offer a robust and reliable form of non-destructive testing of materials where access to the sample is restricted or when sample handling can interfere with the monitoring or analysis process due to externally incorporated changes to the material’s physical state or accidental contamination during the removal or testing process. Ultrasonic based techniques are increasingly used for quality control and production monitoring functions which requires evaluation of changes in material properties for a wide range of industrial applications such as cement paste quality, plastic/polymer extrusion process, dough and even sugar content in beverage drinks. In addition, ultrasound techniques are of great interest for their capability to take rapid measurements in systems which are optically opaque. The conventional industry approach for characterising the rheological properties of suspensions during processing/packaging stage is mainly through the use of viscometer and some through the use of rheometer. One of the potential limitations of viscometer and rheometer based measurements is that the collection and preparation of the solder paste samples can irreversibly alter the structure and flow behaviour of the sample. Hence the measurement may not represent the actual quality of the whole production batch. Secondly, rheological measurements and the interpretation of rheological data is a very technical and time consuming process, which requires professionally trained R&D personnel. The ultrasound technique being proposed provides simple, yet accurate and easy to use solution for the in-situ rheological characterisation of solder pastes which will benefit the materials suppliers (who formulate and produce solder pastes) and solder paste consumers (especially, contract electronics manufacturers). The results from the work show that the technique can be used by R&D personnel involved in paste formulation and manufacture to monitor the batch-to-batch quality and consistency.

Item Type:	Book Section
Additional Information:	This paper which forms part of the published proceedings was given at the 2008 10th Electronics Packaging Technology Conference - (EPTC 2008), held 9-12 Dec 2008, Singapore.
Uncontrolled Keywords:	cement-based materials, microstructure, attenuation, viscosity, stress
Subjects:	T Technology > T Technology (General) T Technology > TS Manufactures 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 Publisher Organisation Organisation Organisation
Last Modified:	27 Jan 2020 12:48
URI:	http://gala.gre.ac.uk/id/eprint/2677

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