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J. Korean Ceram. Soc. > Volume 29(7); 1992 > Article
Journal of the Korean Ceramic Society 1992;29(7): 517.
반응결합한 알루미나의 미구조와 파괴거동에 대한 비교 연구
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전남대학교 무기재료공학과
A Comparative Study of Microstructure and Fracture Behavior in Reaction-Bonded Alumina
ABSTRACT
For the present study two alumina bodies were prepared. The sinter-aid alumina body(SAA) was made by conventional sinter-process using sintering additives of TiO2 & MgO/CaO and the reaction-bonded alumina (RBA) made from Al-Al2O3 mixed powder. A comparison was made between those two bodies and this investigation seeks to evaluate their microstructure, physical properties and material's reliability as well as their fracture behaviour. In spite of its considerable microstructural densification accompanied by sintering shrinkage, SAA is largely inferior to RBA in fracture strength. However, SAA shows a somewhat higher m-value than RBA in respect to the material's reliability, the Weibull modulus(m). RBA, which has high fracture strength, shows much longer lifetime under static loading than SAA. Though, as with m of fracture strength, the reliability(mt) of lifetime prediction in RBA is less high than of SAA.
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