ISBN 9783843949101

978-3-8439-4910-1, Reihe Ingenieurwissenschaften

Daniel Manuel Teufl
Improving the 2.45 GHz Microwave Processing of Fiber Reinforced Plastics

206 Seiten, Dissertation Technische Universität München (2021), Softcover, A5

Zusammenfassung / Abstract

In the field of composite curing, Microwave processing shows a potential of up to 50% cycle time reduction with huge energy savings. However, it is not picked up by industry. A too low technology readiness level in some details of microwave processing is a potential reason for this. Consequently, this work advances two important areas of microwave processing: Process Control and Absorber Technology. The progress is validated by using a mechanical investigation of manufactured composite samples.

A better temperature homogeneity and a more stable process can be realized by three methods:

1. by increasing the randomness in the microwave field through Mode Stirrers, a constant Magnetron Change, and more Magnetrons;

2. by matching the available microwave power to the heated mass;

3. by adapting the control parameters.

To advance the absorber technology for microwave processing, a manufacturing process for a variable absorber is defined and demonstrated at laboratory scale. The distinct influences of two carbon blacks and a silicon carbid on the dielectric properties of an epoxy resin are quantified.

The progress made in microwave processing is validated using manufacturing trials. For these, samples are prepared and tested using oven and microwave at identical process conditions. A minor difference between the configurations in the development of the Glass Transition Temperature and the ILSS Properties is observed.

Bei der Aushärtung von Faserkunststoffverbundbauteilen ermöglicht die Mikrowellenhärtung eine Zykluszeitreduzierung von bis zu 50% und große Energieeinsparungen. Dennoch wird sie nicht in der Industrie aufgegriffen. Eine Ursache hierfür ist der geringe technologische Reifegrad einiger Technologieelemente. In dieser Arbeit wird daher die Steuerung des Prozesses und die Absorbertechnologie weiterentwickelt. Die Technologie wird darüber hinaus mit der Untersuchung von Faserverbundproben validiert.