Effect of Grain Boundary Composition on Microstructure and Mechanical Properties of Silicon Carbide

,; ,; ,; ,; ,; ,

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

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.

Key words: Silicon Carbide, Yttrium-Aluminum Garnet, Silica, Microstructure, Mechanical Property