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J. Korean Ceram. Soc. > Volume 46(5); 2009 > Article
Journal of the Korean Ceramic Society 2009;46(5): 478.
doi: https://doi.org/10.4191/kcers.2009.46.5.478
질화상압(NPS)법으로 제조한 질화규소의 열충격 저항성 및 내부식성 특성평가
곽길호, 김철, 한인섭1, 이기성
국민대학교 기계자동차공학부
1한국에너지기술연구원 융복합재료연구센터
Thermal Shock and Hot Corrosion Resistance of Si3N4 Fabricated by Nitrided Pressureless Sintering
Kil-Ho Kwak, Chul Kim, In-Sub Han1, Kee-Sung Lee
School of Mechanical and Automotive Engineering, Kookmin University
1Convergence Materials Research Center, Korea Institute of Energy Research
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.
Key words: Nitrided Pressureless Sintering(NPS), Silicon nitride, Thermal shock resistance, Corrosion resistance
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