Ferrite multiphase/carbon nanotube composites sintered by microwave sintering and spark plasma sintering

Title
Ferrite multiphase/carbon nanotube composites sintered by microwave sintering and spark plasma sintering
Author(s)
한영환X. Zhou[X. Zhou]J. Zhou[J. Zhou]L. Shen[L. Shen]P. Matli[P. Matli]이재형배소익이동연Q. Huang[Q. Huang]
Keywords
MAGNETIC-PROPERTIES; CARBON NANOTUBES; NIZN FERRITE; HIGH-PERMEABILITY; COBALT FERRITE; HIGH-FREQUENCY; NANOPARTICLES; TEMPERATURE; NANOPOWDERS; ROUTE
Issue Date
201410
Publisher
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
Citation
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, v.122, no.1430, pp.881 - 885
Abstract
Ni-Carbon nanotube (CNT)-Ni0.5Zn0.5Fe2O4 multiphase composites were successfully prepared using microwave sintering (MWS) and spark plasma sintering (SPS) techniques. The obtained samples were characterized by scanning electron microscopy, electrical conductivity, and physical properties measurement system with vibrating sample magnetometer. The SPS prepared composites exhibited higher density, fine grain size, and to maintain favorable three-dimensional conductive network of CNTs compared with the microwave sintered (MWS) ones. Whether use MWS or SPS, both the density and the grain size are increasing with the CNTcontent increment. The increasing of density and grain size is the main contribution of the saturation magnetization increasing. In the composites of high content of CNTs (such as 5wt%), the spinel structure of ferrite was totally destroyed, as indicated by a considerable decrease in the saturation magnetization. Interestingly, it is found that the Curie temperature increases with the increment of CNT content while the high saturation magnetization was maintained, which has implication that the multiphase ferrite composites will find application in a broad temperature range. (C) 2014 The Ceramic Society of Japan. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/30660http://dx.doi.org/10.2109/jcersj2.122.881
ISSN
1882-0743
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공과대학 > 신소재공학부 > Articles
공과대학 > 기계공학부 > Articles
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