Processing of materials using electromagnetic fields

Ku, Harry S. (2012) Processing of materials using electromagnetic fields. In: Wiley encyclopedia of composites, 2nd ed. John Wiley & Sons, Inc., Hoboken, NJ. United States, pp. 2487-2500. ISBN 978-0-470-12828-2

Text Electromagnetic_fields.doc Download (6MB)

Abstract

The paper started by explaining the advantages of microwave processing over conventional heating of materials. This was followed by mentioning that loss tangent is the most important property in microwave processing. The most common generator of microwaves is 2.45 GHz magnetron which is used in home microwave ovens. However, the drawback of microwave processing of materials, using fixed frequency irradiation, is localized heating which would eventually lead to thermal runaway. Variable frequency microwave (VFM) processing of materials was therefore mentioned together with its advantages. VFM offers rapid, uniform and selective heating over a large volume and at a high energy coupling efficiency. This is accomplished using preselected bandwidth sweeping around a central frequency employing tuneable sources such as travelling wave tubes as the microwave power amplifier. Several recent successful applications using fixed and variable frequency microwaves were than described.

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Item Type:	Book Chapter (Commonwealth Reporting Category B)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	Copyright © 1999–2013 John Wiley & Sons, Inc. 'Electronic resource'.
Faculty/School / Institute/Centre:	Historic - Faculty of Engineering and Surveying - No Department (Up to 30 Jun 2013)
Faculty/School / Institute/Centre:	Historic - Faculty of Engineering and Surveying - No Department (Up to 30 Jun 2013)
Date Deposited:	20 Jun 2013 01:35
Last Modified:	08 Nov 2022 05:00
Uncontrolled Keywords:	microwaves; fixed frequency microwaves; variable frequency microwaves; VFM; thermal runaway and loss tangent
Fields of Research (2008):	09 Engineering > 0906 Electrical and Electronic Engineering > 090603 Industrial Electronics 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials 09 Engineering > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations
Fields of Research (2020):	40 ENGINEERING > 4009 Electronics, sensors and digital hardware > 400907 Industrial electronics 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401205 Experimental methods in fluid flow, heat and mass transfer
Socio-Economic Objectives (2008):	B Economic Development > 86 Manufacturing > 8699 Other Manufacturing > 869999 Manufacturing not elsewhere classified E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI:	https://doi.org/10.1002/9781118097298
URI:	http://eprints.usq.edu.au/id/eprint/21960

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