Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Densification and Mechanical Properties of Silicon Nitride Containing Lu2O3-SiO2 Additives

Lu2O3-SiO2계 소결조제를 포함하는 Silicon Nitride의 소결 특성 및 기계적 거동

  • Lee, Sea-Hoon (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Jo, Chun-Rae (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Ko, Jae-Woong (Engineering Ceramics Research Group, Korea Institute of Materials Science) ;
  • Kim, Hai-Doo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
  • 이세훈 (한국 기계연구원 부설 재료연구소 엔지니어링세라믹연구그룹) ;
  • 조춘래 (한국 기계연구원 부설 재료연구소 엔지니어링세라믹연구그룹) ;
  • 박영조 (한국 기계연구원 부설 재료연구소 엔지니어링세라믹연구그룹) ;
  • 고재웅 (한국 기계연구원 부설 재료연구소 엔지니어링세라믹연구그룹) ;
  • 김해두 (한국 기계연구원 부설 재료연구소 엔지니어링세라믹연구그룹)
  • Received : 2011.08.12
  • Accepted : 2011.09.07
  • Published : 2011.09.30
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Abstract

Gas pressure sintering (GPS) of reaction bonded silicon nitride (RBSN) was performed using $Lu_2O_3-SiO_2$ additive and the properties were compared with those of specimens prepared using high purity $Si_3N_4$ powder. The relative density of RBSN and compacted $Si_3N_4$ powder were 68.9 and 47.1%, and total linear shrinkage after sintering at $1900^{\circ}C$ were 14.8 and 42.9%, respectively. High nitrogen partial pressure (5MPa) was required during sintering at $1900^{\circ}C$ in order to prevent the decomposition of the nitride and to promote the formation of SiC. The relative density and 4-point bending strength of RBSN and $Si_3N_4$ powder compact were 97.7%, 954MPa and 98.2%, 792MPa, respectively, after sintering at $1900^{\circ}C$. The sintered RBSN also showed high fracture toughness of 9.2MPam$^{1/2}$.

Keywords

References

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