Magnetic, Thermal And Dielectric Properties Of Ferrite-Filled Epoxy Thin Film Composites
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Date
2014-01
Authors
Boon, Moon See
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The aim of this research is to study the magnetic, thermal and dielectric
properties of ferrite filled epoxy thin film composites for electromagnetic
applications. Spin coating technique was used to prepare the thin film composites.
The properties of different ferrite filler particles (NiZn ferrite, Ni ferrite and
magnetite) filled epoxy thin film composites were investigated in the first stage of
the study. It was found that NiZn ferrite filled composite exhibited higher magnetic
and thermal properties than Ni ferrite and magnetite filled composite. However,
magnetite was chosen as filler to be used in the second stage since it is much cheaper
than NiZn ferrite and it also presented the highest dielectric properties among three
ferrite filled composites. In the second stage, the effect of surface treatment of
magnetite by 3-aminopropyl triethoxysilane coupling agent (3APTES) was
determined. In order to observe the relationship between concentration of coupling
agent and treatment time towards the properties of magnetite filled epoxy thin film
composite, different percentage of 3APTES (5, 10 and 20 wt. %) with variable time
(3, 5 and 7 hours) were carried out. The increased of 3APTES amount associated
with increasing treatment time enhanced interfacial adhesion of magnetite-matrix,
which subsequently resulted an improvement in magnetic, dielectric and thermal
properties of the treated composites. However, at fixed treatment time, system
treated at 20 wt. % exhibited lower saturation magnetization and thermal
conductivity than system treated at 10 wt. %. This phenomenon could be typical due
to thick silane coating layer on magnetite filler surface. The relationships between
these two factors to the responses (magnetic and dielectric) were determined using
Design of Experiment (DOE). Solution 1 of 16.66 wt. % 3APTES and 7 hours
treatment time to achieve optimum desired response was selected. Confirmation of
the testing result showed that the predicted values of responses match with those of
the experimental results.
Description
Keywords
Magnetic, Thermal And Dielectric , Ferrite-Filled Epoxy Thin Film