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J. Korean Ceram. Soc. > Volume 35(9); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(9): 911.
입계상 조성이 탄화규소의 미세구조와 기계적 특성에 미치는 영향
김재연, 김영욱, 이준근1
서울시립대학교 재료공학과
1한국과학기술연구원 복합기능세라믹스 연구센터
Effect of Grain Boundary Composition on Microstructure and Mechanical Properties of Silicon Carbide
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.
Key words: Silicon Carbide, Yttrium-Aluminum Garnet, Silica, Microstructure, Mechanical Property
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