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Sintering of ferrites in the presence of fluxes

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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

  1. 1.

    In the sintering of 4-oersted Mg-Mn ferrites a strong effect is exerted by fluxes with a melting point < 1000°C, and on 2-oersted ferrites by fluxes with melting points on the order of 1100°C.

  2. 2.

    In the sintering of 2- and 4-oersted Mg-Mn fluxes with CaO, the flux is a eutectic of 32 mole% CaO and 68 mole% FeO.

  3. 3.

    The surface tension, σliq-air, of real fluxes affecting the sintering of Mg-Mn ferrites is 150–450 dyn/cm.

  4. 4.

    Optimum rectangularity and squareness of the hysteresis loop are obtained with sintering of Mg-Mn ferrites with Bi2O3 (Hc2=4 Oe) and CaO (Hc=2 Oe). With Bi2O3 the sintering temperature of the ferrites is lower by 200°C, and with CaO by 100°C.

  5. 5.

    The optimum effect of Bi2O3 is explained by the formation of a homogeneous grain as a result of the good wetting and, possibly by the lack of a capacity on the part of Bi2O3 to react with the ferrite or its components; for CaO it is explained also by the formation of a eutectic only with FeO, with the bonding of Fe2+ ions.

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Authors and Affiliations

  1. Moscow

    V. G. Glotov

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  1. V. G. Glotov
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Translated from Poroshkovaya Metallurgiya, No. 2 (74), pp. 22–29, February, 1969.

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Glotov, V.G. Sintering of ferrites in the presence of fluxes. Powder Metall Met Ceram 8, 104–109 (1969). https://doi.org/10.1007/BF00774813

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  • DOI: https://doi.org/10.1007/BF00774813

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