Synthesis of Ni-Zn ferrites by microwave decomposition of hydrotalcites for the functionalization of porcelain substrates
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/146250
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Synthesis of Ni-Zn ferrites by microwave decomposition of hydrotalcites for the functionalization of porcelain substratesData de publicació
2022-06-20Editor
Cámara de Comercio de CastellónISBN
9788495931412Cita bibliogràfica
Lahlahi Attalhaoui, Abderrahim & Nebot-Diaz, I & Oset, M & Paulo, J. (2022). Synthesis of Ni-Zn ferrites by microwave decomposition of hydrotalcites for the functionalization of porcelain substrates.Tipus de document
info:eu-repo/semantics/conferenceObjectVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
This project describes the development of a ceramic substrate for use in
electromagnetic induction plates, which are traditionally made of glass-ceramic
material. The glass-ceramic materials used for this type of ... [+]
This project describes the development of a ceramic substrate for use in
electromagnetic induction plates, which are traditionally made of glass-ceramic
material. The glass-ceramic materials used for this type of application are mainly
characterised by their high resistance to thermal shock and their high magnetic
permeability indexes, which prevent or minimise shielding of the magnetic field. In order to develop such a ceramic material with the magnetic, thermal and
mechanical properties required for induction heating technology, a porcelain stoneware
composition was doped with mixed ferrites of Ni-Zn. These ferrites are characterised by
their low coercivity coefficients, which encourages flow of a high-frequency magnetic
field. The ferrites were prepared by different synthesis routes and even ferrite
nanoparticles were produced without the need to resort to highly energy-intensive
milling processes.
Including ferrites in a porcelain stoneware composition generates magnetisation,
creating eddy currents that heat the entire mass of the substrate very uniformly by the
Joule effect. This leads to a reduced temperature gradient inside the workpiece, unlike
compositions with no ferrites, in which heating is by direct conduction.
By reducing the temperature gradient in the workpiece, it is possible to reduce
the difference in internal stresses between the top and bottom of the plate, which is the
main cause of thermal shock fracture.
In addition to thermal shock, other essential properties in this type of materials,
such as magnetic permeability and mechanical strength, were also improved. The last
section of the project was dedicated to studying the potential variables that affect
viability in industrial production (dilatometric, thermal and mechanical studies, etc.). [-]
Descripció
Ponència presentada al: Qualicer 2022 : XVII Congreso Mundial de la Calidad del Azulejo y del Pavimento Cerámico : 20 y 21 de junio de 2022, Castellón.
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