Header menu link for other important links
X
Effect of milling energy on mechanical activation of (Mo + Si3N4) powders during the synthesis of Si3N4-MoSi2 in situ composites
Published in
2009
Volume: 29
   
Issue: 10
Pages: 2069 - 2077
Abstract
Attempts have been made to study the effect of milling energy and type of grinding media on the mechanical activation during the production of MoSi2 from a reaction between Mo and Si3N4. Powder mixtures of Mo and Si3N4 in the molar ratios of 1:1, 1:2 and 1:3 were ball milled using WC, steel, and ZrO2 grinding media for mechanical activation. In order to evaluate the results obtained after high-energy ball milling and pyrolysis of these milled powder mixture, milling parameters have been converted to two energy parameters, namely, impact energy of the ball and total energy of milling. The optimum impact energy of ball required for mechanical activation of Mo + xSi3N4 (x = 3, 2, 1) powder mixtures by WC grinding media was found to be in the range of 0.145-0.173 J, which leads to a reduction of pyrolysis temperature by 100-200 °C. Samples milled with higher impact energy than the optimum range led to formation of undesirable phases, which dilutes the effect of mechanical activation. Samples milled with both steel and ZrO2 grinding media having lower impact energies than the optimum show the presence of enormous contamination during milling and phases like ZrSi2, Fe3Si and Fe5Si3 were observed after pyrolysis without any significant reduction in pyrolysis temperature required for MoSi2 synthesis. © 2008 Elsevier Ltd. All rights reserved.
About the journal
JournalJournal of the European Ceramic Society
ISSN09552219
Open AccessNo
Concepts (36)
  •  related image
    Ball-milled
  •  related image
    Composites
  •  related image
    Energy parameters
  •  related image
    GRINDING MEDIAS
  •  related image
    HIGH-ENERGY BALL MILLINGS
  •  related image
    IMPACT ENERGIES
  •  related image
    IN-SITU COMPOSITES
  •  related image
    MECHANICAL ACTIVATIONS
  •  related image
    MILLED POWDERS
  •  related image
    Milling
  •  related image
    MILLING ENERGIES
  •  related image
    MILLING PARAMETERS
  •  related image
    Molar ratios
  •  related image
    POWDER MIXTURES
  •  related image
    PYROLYSIS TEMPERATURES
  •  related image
    SI<SUB>3</SUB>N<SUB>4</SUB>
  •  related image
    STRUCTURAL APPLICATION
  •  related image
    TOTAL ENERGIES
  •  related image
    Ball milling
  •  related image
    Complexation
  •  related image
    Fatigue crack propagation
  •  related image
    GRINDING (COMMINUTION)
  •  related image
    Grinding (machining)
  •  related image
    Milling (machining)
  •  related image
    Mixtures
  •  related image
    Molybdenum
  •  related image
    Powders
  •  related image
    Pyrolysis
  •  related image
    Silicides
  •  related image
    Silicon
  •  related image
    Spheres
  •  related image
    Steel
  •  related image
    Thermogravimetric analysis
  •  related image
    Tungsten carbide
  •  related image
    Zirconium alloys
  •  related image
    Activation energy