Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Grain Boundary Composition on Microstructure and Mechanical Properties of Silicon Carbide

입계상 조성이 탄화규소의 미세구조와 기계적 특성에 미치는 영향

  • 김재연 (서울시립대학교 재료공학과) ;
  • 김영욱 (서울시립대학교 재료공학과) ;
  • 이준근 (한국과학기술연구원 복합기능세라믹스 연구센터)
  • Published : 1998.09.01
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Abstract

By using {{{{ { { {Y }_{3 }Al }_{5 }O }_{12 } }} (YAG) and SiO2 as sintering additives the effect of the composition of sintering ad-ditives on microstructure and mechanical properties of the hog-pressed and subsequently annealed SiC ma-terials were investigated. Microstructures of sintered and annealed materials were strongly dependent onthe composition of sintering additives. The average diameter and volume fraction of elongated grains in an-nealed materials increased with the SiO2/YAg ratio while the fracture toughness increased with the SiO2/YAg ratio. The average MPa.{{{{ { m}^{1/2 } }} respectively. Typical strength and fracture toughness of an annealed material with SiO2/YAg ra-tionof 0.67 were 371 MPa and 5.6 MPa.{{{{ { m}^{1/2 } }} respectively.

Keywords

References

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