Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Thermal Shock and Hot Corrosion Resistance of Si3N4 Fabricated by Nitrided Pressureless Sintering

질화상압(NPS)법으로 제조한 질화규소의 열충격 저항성 및 내부식성 특성평가

  • Kwak, Kil-Ho (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Kim, Chul (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Han, In-Sub (Convergence Materials Research Center, Korea Institute of Energy Research) ;
  • Lee, Kee-Sung (School of Mechanical and Automotive Engineering, Kookmin University)
  • 곽길호 (국민대학교 기계자동차공학부) ;
  • 김철 (국민대학교 기계자동차공학부) ;
  • 한인섭 (한국에너지기술연구원 융복합재료연구센터) ;
  • 이기성 (국민대학교 기계자동차공학부)
  • Published : 2009.09.30
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Abstract

Thermal shock and hot corrosion resistance of silicon nitride ceramics are investigated in this study. Silicon nitrides are fabricated by nitride pressureless sintering (NPS) process, which process is the continuous process of nitridation reaction of Si metal combined with subsequent pressureless sintering. The results of thermal shock test show it sustains 400MPa of initial strength during test in the designated condition of ${\Delta}T=700{\sim}25^{\circ}C$ up to maximum 4,800 cycles. Hot corrosion tests also reveal that the strength degradation of NPS silicon nitride did not occur at $700^{\circ}C$ with an exposure in Ar, $H_2$, Na and K for 1,275 h.

Keywords

References

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