Influence of small amount of sintering additives on unlubricated sliding wear properties of SiC ceramics

B. V. Manoj Kumar, Young Wook Kim, Dae-Soon Lim, Won Seon Seo

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Abstract

Fully densified SiC ceramics were developed from commercially available β-SiC powders using small amount (3 wt%) of AlN-Sc2O3 or AlN-Y2O3 additives by hot pressing at 2050 °C for 6 h in nitrogen atmosphere, and their wear properties were investigated by subjecting to self-mated sliding at different loads (1, 6 and 13 N) under unlubricated conditions. SiC ceramics prepared with 3 wt% AlN-Y 2O3 additives consisted of mostly large equi-axed grains with amorphous grain boundary phase of ∼1.2 nm thickness, whereas SiC ceramics sintered with 3 wt% AlN-Sc2O3 additives showed duplex microstructure of elongated and fine equi-axed grains with clean grain boundary. As the load was increased, the steady state coefficient of friction reduced from ∼0.6 to ∼0.2, and wear rate increased from 10-6 to 10-5 mm3/N·m. It was observed that the friction did not depend on the additive composition, while less wear was observed for the SiC ceramics sintered with 3 wt% AlN-Sc2O3 additives consisting of clean grain boundary. The material loss was increased with the increased amount of sintering additive to 10 wt%. The worn surface morphology revealed that the material was primarily removed via surface grooving and microcracking at 1 N load, while tribochemical wear dominated at 6 and 13 N loads.

Original languageEnglish
Pages (from-to)3599-3608
Number of pages10
JournalCeramics International
Volume37
Issue number8
DOIs
Publication statusPublished - 2011 Dec 1

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Keywords

  • Silicon carbide
  • Sintering additives
  • Sliding wear

ASJC Scopus subject areas

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

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