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Experimental investigation of open-ended microwave oven assisted encapsulation process

 
: Pavuluri, Sumanth Kumar; Ferenets, Marju; Goussetis, George; Desmulliez, Marc P.Y.; Tilford, Tim; Adamietz, Raphael; Müller, Guido; Eicher, Frank; Bailey, Chris

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Institute of Electrical and Electronics Engineers -IEEE-; VDE/VDI-Gesellschaft Mikroelektronik, Mikro- und Feinwerktechnik -GMM-:
3rd Electronics System Integration Technology Conference, ESTC 2010. Proceedings. Vol.1 : Berlin, Germany, 13 - 16 September 2010
New York, NY: IEEE, 2010
ISBN: 978-1-4244-8553-6
ISBN: 978-1-4244-8554-3
S.449-454
Electronics System Integration Technology Conference (ESTC) <3, 2010, Berlin>
Englisch
Konferenzbeitrag
Fraunhofer IPA ()
Aufbautechnik; Verbindungstechnik; electronic packaging; packaging; microwave; Mikrowelle

Abstract
An open ended microwave oven is presented with improved uniform heating, heating rates and power conversion efficiency. This next generation oven produces more uniform EM fields in the evanescent region forming part of the heating area of the oven. These fields are vital for the rapid and uniform heating of various electromagnetically lossy materials. A fibre optic temperature sensor and an IR pyrometer are used to measure in situ and in real-time the temperature of the curing materials. An automatic computer controlled closed feedback loop measures the temperature in the curing material and drives the microwave components to obtain predetermined curing temperature cycles for efficient curing. Uniform curing of the lossy encapsulants is achieved with this oven with typical cure cycle of 270 seconds with a ramp rate of 1°C/s and a hold period of 2 minutes. Differential scanning calorimeter based measurement for the pulsed microwave based curing of the polymer dielectric indicates a ~ 100% degree of cure.

: http://publica.fraunhofer.de/dokumente/N-174744.html