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Wear Properties of Silicon Nitride Nano-Ceramics

나노 질화규소 세라믹스의 내마모 특성

  • Kim, Jae-Hee (Department of Materials Science and Engineering, Seoul National University) ;
  • Kumar B, Venkata Manoj (Department of Materials Science and Engineering, Seoul National University) ;
  • Kim, Won-Sik (Department of Materials Science and Engineering, Seoul National University) ;
  • Hong, Seong-Hyeon (Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM))
  • 김재희 (서울대학교 재료공학부) ;
  • ;
  • 김원식 (서울대학교 재료공학부) ;
  • 홍성현 (신소재공동연구소 (RIAM))
  • Published : 2009.09.30

Abstract

In this study, bulk nano-crystalline $Si_3N_4$ ceramics were fabricated by spark plasma sintering (SPS) and their mechanical properties, in particular wear, were investigated. A wide range of grain sizes, from 80 nm and 250 nm were obtained by varying sintering conditions ($1550^{\circ}C$-5 min to $1650^{\circ}C$-20 min). The elastic modulus of obtained ceramics was ${\sim}250$ GPa and hardness was in the range of $13{\sim}14$ GPa. The indentation fracture toughness increased from $2.58MPa{\cdot}m^{1/2}$ to $3.24MPa{\cdot}m^{1/2}$ with increasing sintering temperature possibly due to the elongated grains. Sliding wear tests revealed at least an order magnitude improvement in wear resistance with grain refinement. Microstructure analysis indicated that nano-$Si_3N_4$ specimens worn mainly through delamination and microcracking, while that of coarser specimens revealed severe wear with grain debonding and fracture.

Keywords

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