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Preparation and sintering microstructure of nanometer Fe coated Si3N4 composite powders[J]. Acta Materiae Compositae Sinica, 2009, 26(2): 30-36.
Citation: Preparation and sintering microstructure of nanometer Fe coated Si3N4 composite powders[J]. Acta Materiae Compositae Sinica, 2009, 26(2): 30-36.
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Preparation and sintering microstructure of nanometer Fe coated Si3N4 composite powders

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  • Received Date: March 24, 2008
  • Revised Date: June 15, 2008
    Abstract
  • Fe/Si3N4 composite powder was synthesized by the heterogeneous precipitation-thermal reduction process，and then pressed into flakes under a pressure of 10 MPa. The flakes were sintered by pressureless and hot-pressing at 1873K in 0.1 MPaN2. The chemical composition，microstructure and phases of the composite powder and the sintered flakes were investigated by scanning electron microscopy (SEM)，transmission electron microscopy (TEM)，energy dispersive  spectroscopy (EDS) and X-ray diffraction (XRD). It is proved that the structure of the composite powders is Si3N4 coated by nano Fe. The crystal phases of sintered flakes by pressureless are iron silicide，SiC andSi3N4. The crystal phases of the sintered samples by hot-pressing are Fe，iron silicide and Si3N4. It is found that the crystal phases flakes by pressureless and hot-pressing are very different.
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