Prema, K H; Dr. Philip, Kurian(Cochin University of Science and Technology, September , 2007)
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Abstract:
In the present study the preparation and characterisation of rubber ferrite
composites containing nickel ferrite and gamma ferric oxide have been dealt with.Synthetic rubbers viz. ethylene propylene diene rubber and neoprene rubber were used
for the incorporation of nickel ferrite and gamma ferric oxide for the synthesis of
RFCs. Incorporation of ferrites were carried out according to a specific recipe for
various loadings of the magnetic fillers. The ferrites used for the preparation of RFCs
were synthesised using sol-gel method and structural characterisation was carried out.
Experimental techniques like X-ray diffraction, Transmission electron microscopy and
other analytical techniques were used for this. Precharaterised ferrites were then
incorporated at different loading into rubber according to conventional mixing
methods. The cure characteristics, mechanical, dielectric, magnetic and microwave
properties of these composites were evaluated. The effect of carbon black on these
properties of RFCs were carried out.
Description:
Department of Polymer Science and Rubber Technology,
Cochin University of Science & Technology
Sindhu, S; Dr.Anantharaman, M R(Cochin University of Science and Technology, April , 2001)
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Abstract:
The objectives of the proposed work are preparation of ceramic nickel zinc ferrite belonging to the series Ni1-XZnXFe2O4 with x varying from 0 to 1in steps of 0.2, structrural, magnetic and electrical characterization of Ni1-XZnXFe2O4, preparation and evaluation of Cure characteristics of Rubber Ferrite Composites (RFCs), magnetic characterization of RFCs using vibrating sample magnetometer (VSM), electrical characterization of RFCs and estimation of magnetostriction constant form HL parameters. The study deals with the structural and magnetic properties of ceramic fillers, variation of coercivity with composition and the variation of magnetization for different filler loadings are compared and correlated. The dielectric properties of ceramic Ni1-XZnXFe2O4 and rubber ferrite composites containing Ni1-XZnXFe2O4 were evaluated and the ac electrical conductivity (ac) of ceramic as well as composite samples can be calculated by using a simple relationship of the form ac = 2f tan 0r, with the data available from dielectric measurements. The results suggest that the ac electrical conductivity is directly proportional to the frequency