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Properties and densification of nanocrystalline MoSi2–Si3N4composite from mechanically alloyed powders by pulsed current-activated sintering

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
502
Issue
1
Identifiers
DOI: 10.1016/j.jallcom.2010.04.120
Keywords
  • Powder Metallurgy
  • Sintering
  • Nanostructured Materials
  • Mechanical Properties

Abstract

Abstract Nanosized MoSi 2 and Si 3N 4 powders were synthesized from Mo 2N and Si powders by high-energy ball milling. A dense nanocrystalline MoSi 2–Si 3N 4 composite was consolidated using the pulsed current-activated sintering (PCAS) method within 3 min period from the mechanically activated MoSi 2 and Si 3N 4 powders. A highly dense MoSi 2–Si 3N 4 composite, with relative density of up to 97%, was produced under the simultaneous application of 80 MPa pressure and 2800 A pulsed current. The mean grain size, hardness, and fracture toughness of the composite were investigated.

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