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Microwave Sintering of Baryum Hexaferrite

  • D. Rousselle (a1), D. Autissier (a1), B. Guillou (a2) and J. Leclerc (a3)


Conventional sintering of baryum hexaferrite Co2Z leads to a mixture of phases with a low density. In this paper we try to obtain a pure densified CO2Z hexaferrite by microwave heating. The design of the applicator is computed from both the electromagnetic physical characteristics, the dimensions and the shape of the hexaferrite sample. The travelling microwave mode is preferred to the resonant one. Microwave process consists in a debinding step followed by the high temperature sintering cycle. Sintering temperature evaluated by infrared sensors seems to be over-valued. A skin effect is observed which can be attributed to electronic conductivity due to high temperature formation of Fe2+ ions.



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[1] Clark, D.E., Gac, F.D., Sutton, W.H., Microwaves theory and application in materials processing, Ceramic Transactions, vol. 21, The American Ceramic Society, 1991
[2] Harrington, R.F., Time Harmonic Electromagnetic Fields, 219, McGraw Hill Compagny, 1961
[3] Ragan, , Microwave Transmission Circuit Radiation Laboratories Series no 9, 364, McGraw Hill
[4] Rousselle, D., Autissier, D., Journal de physique IV, Colloque C7, Supplément au Journal de physique III, vol. 3, 783, 1993
[5] Autissier, D., thesis, University of Strasbourg, 1988
[6] Clark, D.E., Foltz, D.C., MRS Bulletin, 41, November 1993
[7] Jacquiod, C., thesis, University of Strasbourg, 1994

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Microwave Sintering of Baryum Hexaferrite

  • D. Rousselle (a1), D. Autissier (a1), B. Guillou (a2) and J. Leclerc (a3)


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