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Evidence for the Microwave Effect During Hybrid Sintering

2006; Wiley; Volume: 89; Issue: 6 Linguagem: Inglês

10.1111/j.1551-2916.2006.00976.x

1551-2916

J. Wang, Jon Binner, Bala Vaidhyanathan, N. Joomun, John A. Kilner, Georgios Dimitrakis, T.E. Cross,

Microwave-Assisted Synthesis and Applications

Journal of the American Ceramic SocietyVolume 89, Issue 6 p. 1977-1984 Evidence for the Microwave Effect During Hybrid Sintering J. Wang, J. Wang IPTME, Loughborough University, Loughborough LE11 3TU, UKSearch for more papers by this authorJ. Binner, Corresponding Author J. Binner IPTME, Loughborough University, Loughborough LE11 3TU, UK†Author to whom correspondence should be addressed. e-mail: j.binner@lboro.ac.ukSearch for more papers by this authorB. Vaidhyanathan, B. Vaidhyanathan IPTME, Loughborough University, Loughborough LE11 3TU, UKSearch for more papers by this authorN. Joomun, N. Joomun Department of Materials, Imperial College, London SW7 2AZ, UKSearch for more papers by this authorJ. Kilner, J. Kilner Department of Materials, Imperial College, London SW7 2AZ, UKSearch for more papers by this authorG. Dimitrakis, G. Dimitrakis School of Electrical & Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UKSearch for more papers by this authorT.E. Cross, T.E. Cross School of Electrical & Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UKSearch for more papers by this author J. Wang, J. Wang IPTME, Loughborough University, Loughborough LE11 3TU, UKSearch for more papers by this authorJ. Binner, Corresponding Author J. Binner IPTME, Loughborough University, Loughborough LE11 3TU, UK†Author to whom correspondence should be addressed. e-mail: j.binner@lboro.ac.ukSearch for more papers by this authorB. Vaidhyanathan, B. Vaidhyanathan IPTME, Loughborough University, Loughborough LE11 3TU, UKSearch for more papers by this authorN. Joomun, N. Joomun Department of Materials, Imperial College, London SW7 2AZ, UKSearch for more papers by this authorJ. Kilner, J. Kilner Department of Materials, Imperial College, London SW7 2AZ, UKSearch for more papers by this authorG. Dimitrakis, G. Dimitrakis School of Electrical & Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UKSearch for more papers by this authorT.E. Cross, T.E. Cross School of Electrical & Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UKSearch for more papers by this author First published: 13 April 2006 https://doi.org/10.1111/j.1551-2916.2006.00976.xCitations: 124 D. Johnson—contributing editor This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) in the UK under grant reference GR/R52435. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract A microwave/conventional hybrid furnace has been used to sinter three ceramics with different microwave absorption characteristics under pure conventional and a range of microwave/conventional hybrid heating regimes. The precursor powder particle size was also varied for each material. In each case it was ensured that every sample within a series had an identical thermal history in terms of its temperature/time profile. An increase in both the onset of densification and the final density achieved was observed with an increasing fraction of microwave energy used during sintering, the effect being greatest for the materials that absorbed microwaves most readily. Twenty-three percent greater densification was observed for submicron zinc oxide powder, the material with the largest microwave absorption capability, when sintered using hybrid heating involving 1 kW of microwave power compared with pure conventional power under otherwise identical conditions. For the ceramic with the lowest microwave absorption characteristic, alumina, the increase in densification was extremely small; partially stabilized zirconia, a moderate microwave absorber, was intermediate between the two. Temperature gradients within the samples, a potential cause of the effect, were assessed using two different approaches and found to be too small to explain the results. Hence, it is believed that clear evidence has been found to support the existence of a genuine “microwave effect.” Citing Literature Volume89, Issue6June 2006Pages 1977-1984 RelatedInformation