Influence of oxygen content on the microstructure and mechanical properties of SPS SiC

Zeynep Aygüzer Yaşar, Vincent A. DeLucca, Richard Haber

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Abstract

In this paper, two different commercial silicon carbide powders were treated by HF etching, aging and heat treating to obtain various oxygen contents. Fully dense silicon carbide ceramics (>99% th.density) were produced by spark plasma sintering technique at 1900 °C under an applied pressure of 50 MPa for 15 min holding time with boron carbide and carbon additions. Microstructure, polytype of SiC, density, Knoop hardness and fracture behaviors were examined to understand the effect of oxygen content on the properties of dense silicon carbide. The results show that oxygen content affects all of the measured mechanical and microstructural properties. High oxygen content is shown to be detrimental to the final density and hardness of SPS SiC.

Original languageEnglish (US)
Pages (from-to)23248-23253
Number of pages6
JournalCeramics International
Volume44
Issue number18
DOIs
Publication statusPublished - Dec 15 2018

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Keywords

  • Mechanical properties
  • Microstructure
  • Silicon carbide
  • Spark plasma sintering

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