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  • 1
    Digitale Medien
    Digitale Medien
    Barium hexaferrite magnet by topotactic reaction method (1988)
    Springer
    Journal of materials science 23 (1988), S. 3125-3128 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A new topotactic sintering method using αFe2O3 (obtained from αFeO · OH) and BaCO3 is developed for preparing cheaper grain oriented barium hexaferrite. αFe2O3 and BaCO3 (precipitate grade) are wet mixed in a ball mill in stoichiometric proportion. The mixed slurry is then dried at 110° C for about 12h. The dried powder mixture containing moisture as a binder is uniaxially compacted at 5×106−10×106 kg m−2 pressure. The green compacts are air sintered in the temperature range 1100–1300° C for 1 H. The best results of the sintered ferrite show maximum energy product (BH) max in the range 7−10 kTAm−1. The bulk of commercial requirements for toy magnets etc. may be met by this method of production which eliminates steps like calcination and cost intensive wet magnetic compaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00551283
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Studies on plasma dissociation of Indian zircon in a specially developed plasma reactor (1992)
    Springer
    Journal of materials science 27 (1992), S. 1762-1766 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Studies on the preparative and microstructural aspects of plasma-dissociated Indian zircon prepared in a specially designed plasma reactor (20 kW) are reported. The vital parameters involved in the process have been optimized for a high degree of dissociation with maximum feed rate. A near total phase separation (ZrO2 and SiO2) has been achieved in the plasma-dissociated zircon spheroids which constitute over 90% of the product. Microstructural studies have revealed that the spheroids are of two types with a distinct difference in the morphology of zirconia crystallites. Most of the spheroids have been found to have well-developed polygonal grains with spherulitic growth of ZrO2 in SiO2 glass. The rest of the spheroids consist of intergrown tabular crystals of monoclinic zirconia set in a matrix of silica. The silica present in the plasma-dissociated zircon has been amorphous and highly reactive, and is leached out using hot NaOH solution to recover fine grain zirconia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01107201
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