Header menu link for other important links
X
Mechanical and dielectric properties of carbon fiber reinforced reaction bonded silicon nitride composites
G. Logesh, M. Rashad, Mangesh Lodhe, Ummen Sabu,
Published in Elsevier Ltd
2018
Volume: 767
   
Pages: 1083 - 1093
Abstract
Carbon fiber (Cf) reinforced reaction bonded silicon nitride (RBSN) composites with various amounts of fiber (5, 10, 15 and 20 vol %) are fabricated at 1400 °C using the direct nitridation method. The effect of Cf on the phase formation, microstructure evolution, mechanical and dielectric properties has been investigated. The XRD analysis using Rietveld refinement shows the presence of alpha and beta silicon nitride with a trace amount of tungsten disilicide. Microstructural analyses show the uniform dispersion of Cf in the RBSN matrix and the different toughening mechanisms operated in the composites. Mercury intrusion porosimetry results show unimodal to the multimodal distribution of pores with the increase in the quantity of Cf. The porosity of the composites varies from 30 to 38% with the addition of Cf. The addition of Cf has enhanced the fracture toughness of the composites only with 5 vol % Cf and the maximum toughness achieved is 2.5 MPa m1/2. There is no interface reaction on the Cf, which indicates the stability of fibers in the nitrogen atmosphere at 1400 °C. The dielectric performance of the composites in the X-band frequency range (8.2–12.4 GHz) is found to increase with Cf content. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Alloys and Compounds
PublisherData powered by TypesetElsevier Ltd
ISSN09258388
Open AccessNo
Concepts (23)
  •  related image
    Aluminum nitride
  •  related image
    Carbon fibers
  •  related image
    Dielectric properties
  •  related image
    Dielectric properties of solids
  •  related image
    Fibers
  •  related image
    Fracture toughness
  •  related image
    Mechanical properties
  •  related image
    Microstructure
  •  related image
    Nitrides
  •  related image
    Reinforcement
  •  related image
    Rietveld method
  •  related image
    Rietveld refinement
  •  related image
    Silicon nitride
  •  related image
    Tungsten compounds
  •  related image
    CARBON FIBER REINFORCED
  •  related image
    MECHANICAL AND DIELECTRIC PROPERTIES
  •  related image
    Mercury intrusion porosimetry
  •  related image
    Micro-structure evolutions
  •  related image
    Microstructural analysis
  •  related image
    Multimodal distributions
  •  related image
    REACTION BONDING
  •  related image
    REACTION-BONDED SILICON NITRIDES
  •  related image
    FIBER BONDING