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Processing and mechanical characterisation of monolithic silicon carbide ceramic consolidated by spark plasma sintering (SPS)

  • Mehtap Deniz Unlu , Gultekin Goller , Onuralp Yucel and Filiz Cinar Sahin
Published/Copyright: November 30, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 12

Abstract

Silicon carbide ceramics were fabricated using the spark plasma sintering technique without the use of additives. The sintering process was carried out at four different temperatures in the range of 2 073−2 223 K under two different pressures, 40 MPa and 80 MPa, under vacuum. The effects of different temperatures and pressures on the density, Vickers hardness, fracture toughness, and microstructure were examined. Fully dense monolithic silicon carbide ceramics with a relative density of approximately 99 % were obtained. Increasing the pressure from 40 to 80 MPa and the temperature from 2 073 to 2 223 K resulted in an increase in the relative densities of spark plasma sintered ceramics from 87 % to 97.5 % and 95.5 % to 99.7 %, respectively. The results revealed that the silicon carbide ceramic spark plasma sintered at 2 223 K while applying 80 MPa of pressure with a 5-minute soaking time under vacuum has the highest hardness and fracture toughness values of 31.9 GPa and 3.6 ± 0.3 MPa·m1/2, respectively.

Keywords: SiC; Spark plasma sintering; Hardness; Pressure; Fracture toughness
* Correspondence address, Prof. Dr. Filiz Cinar Sahin, Istanbul Technical University, Department of Metallurgical and Materials Engineering, 34469 Istanbul, Turkey, Tel.: +90 2122857166, Fax: +90 2122857178, E-mail:

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Received: 2013-3-8
Accepted: 2013-7-11
Published Online: 2013-11-30
Published in Print: 2013-12-12

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110982
Keywords for this article
SiC; Spark plasma sintering; Hardness; Pressure; Fracture toughness

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Critical sizes for coherent to semicoherent transition in precipitates
  5. Thixoformability evaluation of AA2011 and AA2014 alloys
  6. Joint strength of friction stir welded AISI 304 austenitic stainless steels
  7. Optimization of process parameters in explosive cladding of titanium/stainless steel 304L plates
  8. Optimization of the hot rolling parameters for evaluation of the formability of Nb-microalloyed steel sheet by using the Taguchi method
  9. XPS measurements of LDX 2101 duplex steel surface after magnetoelectropolishing
  10. Phase equilibria of the Al-Cr-Pr ternary system at 773 K
  11. Processing and mechanical characterisation of monolithic silicon carbide ceramic consolidated by spark plasma sintering (SPS)
  12. Effect of Mn doping on the microstructure and dielectric properties of BaHf0.1Ti0.9O3 ceramics
  13. Nano hydroxyapatite–polysulfone coating on Ti-6Al-4V substrate by electrospinning
  14. Photocatalytic and self-cleaning properties of SiO2/TiO2/SiO2 nanostructured thin film
  15. Formation mechanism of manganese vanadate microtubes and their electrochemical sensing properties
  16. Modification of the luminescent properties of ZnS nanoparticles by the adsorbed species
  17. DGM News
  18. DGM News
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