Microwave processing of adhesive joints using a temperature controlled feedback system

Ayodele, Olofinjana, Yarlagadda, Prasad K., & Oloyede, Adekunle (2001) Microwave processing of adhesive joints using a temperature controlled feedback system. International Journal of Machine Tools and Manufacture, 41(2), pp. 209-225.

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Previous experiments have shown that microwave curing of epoxies reduces the curing time and could lead to improvements in the mechanical properties of the cured epoxies. Precise temperature control is important as inadequate control may lead to thermal "run-away", resulting in localized material damage. Consequently, the main objective of the present work is to use temperature for controlling the intensity of microwave radiation during the adhesive curing process. Using microwave energy delivered through a slotted waveguide at a frequency of 2.45 GHz, and with the power varied between 300 and 600 W, three engineering thermoplastics or adherends were joined by curing two types of "two-pack" epoxy adhesives. Subsequently, the bond strengths of the microwave cured samples were compared to those of the specimens cured in ambient conditions by subjecting the joined samples to shear loading. The results obtained indicate that the samples cured with microwave under a temperature feedback control protocol achieved higher bond strengths after curing for only a fraction of the time required for ambient curing. It can therefore be inferred that, with an adequate temperature control strategy, increased efficiency of curing, higher quality of adhesive joint, and improved bond strength can be achieved when joining thermoplastics.

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8 citations in Web of Science®
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ID Code: 6139
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: y.prasad@qut.edu.au
Keywords: Microwave heating, Adhesive curing, Temperature, based control
DOI: 10.1016/S0890-6955(00)00060-2
ISSN: 0890-6955
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Control Systems Robotics and Automation (090602)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2001 Elsevier
Deposited On: 14 Feb 2007 00:00
Last Modified: 10 Aug 2011 13:05

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