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Advanced Ceramics and Composites Using Microwave Technology

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (10 March 2023) | Viewed by 1697

Special Issue Editors


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Guest Editor
Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain
Interests: microwave sintering; composite and nano-composite materials; materials engineering; experimental characterization; ceramic materials; tribology; sintering mechanism; carbon materials; porous materials

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Guest Editor
Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain
Interests: microwaves and dielectric heating; advanced characterization techniques; ceramic and bioceramic materials; wear; mechanical properties: microstructure; sintering precursors; LTD; non-oxides ceramics

Special Issue Information

Dear Colleagues,

The transition towards more sustainable technologies requires energetically efficient and environmentally friendly processes. One route toward this goal is by using the microwave technology-processing of functional ceramics, which mainly concerns oxides. For most oxide ceramics, the conventional sintering temperature is typically above 1400 °C and the sintering time can be on the order of several hours (> 10 h). Ceramic oxide materials are ubiquitous in today’s technologies. For example, nowadays, the electronics industry uses millions of components based on dielectric oxides.

For these and many other reasons, microwave sintering is a very attractive technique for ceramic processing. However, it does require understanding, both from a physical and technological perspective, the main aspects of electromagnetic fields and the interactions in internal microwave cavities dedicated to ceramic sintering.

This Special Issue will focus on the development and design of ceramic materials using non-conventional microwave technology, with an emphasis on their dielectric properties and on the influence of electro-magnetic fields, and will also discuss their final properties and potential applications. This Special Issue will also be intentioned with the aim of not limiting the aspects that seem necessary to understand what occurs regarding microwaves inside ceramics.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Amparo Borrell
Dr. Rut Benavente
Guest Editors

Manuscript Submission Information

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Keywords

  • microwave sintering
  • multi and single-mode cavity
  • electric and magnetic fields
  • advanced characterization techniques
  • ceramic and bio-ceramic-based materials
  • mechanical properties
  • microstructure
  • sintering precursors
  • sintering mechanism
  • dielectric properties
  • materials engineering
  • non-thermal effects

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Published Papers (1 paper)

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Research

12 pages, 4743 KiB  
Article
Effect of Microwave-Assisted Synthesis and Sintering of Lead-Free KNL-NTS Ceramics
by Anggel Lagunas-Chavarría, María Guadalupe Navarro-Rojero, María Dolores Salvador, Rut Benavente, Jose Manuel Catalá-Civera and Amparo Borrell
Materials 2022, 15(11), 3773; https://doi.org/10.3390/ma15113773 - 25 May 2022
Cited by 2 | Viewed by 1630
Abstract
Lead-free piezoelectric powders (K0.44Na0.52Li0.04)(Nb0.82Ta0.10Sb0.04)O3 were obtained by conventional and microwave-assisted reactive heating. Firstly, the synthesis of the material was carried out following the mixed oxide route and employing both traditional [...] Read more.
Lead-free piezoelectric powders (K0.44Na0.52Li0.04)(Nb0.82Ta0.10Sb0.04)O3 were obtained by conventional and microwave-assisted reactive heating. Firstly, the synthesis of the material was carried out following the mixed oxide route and employing both traditional methods and microwave technology. Thermogravimetry, X-ray diffraction, field emission scanning electron microscopy and electrical properties analyses were evaluated. X-ray diffraction of the powders calcined by the microwave process shows the formation of perovskite structure with orthorhombic geometry, but it is possible to observe the presence of other phases. The presence of the secondary phases found can have a great influence on the heating rate during the synthesis on which the kinetics of the reaction of formation of the piezoelectric compound depend. The calcined powder was sintered at different temperatures by conventional and non-conventional processes. The microstructure of the ceramics sintered by microwave at 1050 °C for 10 min shows perovskite cubes with regular geometry, of size close to 2–5 µm. However, the observed porosity (~8%), the presence of liquid phase and secondary phases in the microstructure of the microwave sintered materials lead to a decrease of the piezoelectric constant. The highest d33 value of 146 pC/N was obtained for samples obtained by conventional at 1100 °C 2 h compared to samples sintered by microwave at 1050 °C 10 min (~15 pC/N). Full article
(This article belongs to the Special Issue Advanced Ceramics and Composites Using Microwave Technology)
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