Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation and Properties of Silicon Nitride Ceramics by Nitrided Pressureless Sintering (NPS) Process

Nitrided Pressureless Sintering 공정을 이용한 질화규소 세라믹스의 제조 및 특성

  • Cheon, Sung-Ho (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Chung, Yong-Hee (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Seo, Doo-Won (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Lee, Shi-Woo (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Hong, Kee-Soeg (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Woo, Sang-Kuk (Energy Materials Research Center, Korea Institute of Energy Research)
  • 천승호 (한국에너지기술연구원 에너지재료연구센터) ;
  • 한인섭 (한국에너지기술연구원 에너지재료연구센터) ;
  • 정용희 (한국에너지기술연구원 에너지재료연구센터) ;
  • 서두원 (한국에너지기술연구원 에너지재료연구센터) ;
  • 이시우 (한국에너지기술연구원 에너지재료연구센터) ;
  • 홍기석 (한국에너지기술연구원 에너지재료연구센터) ;
  • 우상국 (한국에너지기술연구원 에너지재료연구센터)
  • Published : 2004.12.01
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Abstract

The mechanical properties and microstructure and thermal properties of Nitrided Pressureless Sintering(NPS) silicon nitride ceramics, containing three type of $Al_{2}O_3,\;Y_{2}O_3$ sintering additives, were investigated. Also, we have investigated the effect of silicon metal content changing with 0, 5, 10, 15, and $20wt\%$ Si in each composition. In $5wt\%\;Al_{2}O_3,\;5wt\%\;Y_{2}O_3,\;and\;5wt\%$ Si composition, silicon nitride sintered body was successfully densified to a high density. The average 4-point flexural strength and relative density of these specimens were 500 MPa and 98% respectively. Also, Thermal expansion coefficient and thermal conductivity of specimens at room temperature were $2.89{\times}10^{-6}/^{\circ}C\;and\;28W/m^{\circ}C$, respectively. The flexural strength of sintered specimens after thermal shock test of 20,000 cycles was maintained as-received value of 500 MPa.

Nitrided Pressureless Sintering(NPS) 공정에 의한 질화규소 세라믹스의 기계적 특성, 미세구조 및 열적 특성을 세 가지조성을 갖는 $Al_{2}O_3,\;Y_{2}O_3$ 소결조제의 변화에 따라 조사하였다. 또한 각 조성에서 금속 실리콘의 첨가량을 0, 5, 10, 15, 그리고 $20wt\%$로 변화를 주어 실리콘의 첨가효과를 조사하였다. $5wt\%\;Al_{2}O_3,\;5wt\%\;Y_{2}O_3$, 그리고 $5wt\%$ Si 조성에서 질화규소 소결체의 치밀화가 진행되었으며, 4점 꺽임강도와 상대밀도는 각각 500 MPa과 $98\%$를 나타내었다. 또한 상온에서 열팽창계수와 열전도도는 각각 $2.89{\times}10^{-6}/^{\circ}C$와 $28W/m^{\circ}C$를 나타내었으며, 20,000회의 열충격 싸이클을 반복한 후, 꺽임강도를 측정한 결과, 초기 500MPa의 강도를 유지하고 있었다.

Keywords

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