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J. Korean Ceram. Soc. > Volume 34(5); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(5): 519.
반응 소결 Alumina의 소결거동과 기계적 성질에 미치는 Al 첨가량의 영향
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전남대학교 무기재료공학과
Effect of Al Amount on the Sintering Behavior and Mechanical Properties of Reaction Bonded Alumina
The effect of Al content and heating rate on the sintering behavior, microstructure, and mechanical properties of reaction bonded alumina (RBAO) was investigated. As the heating rate became slower a critical Al content which could be added to RBAO increased. The weight gain and linear shrinkage of RBAO containing of 55 vol% Al were 28% and 6.5%, respectively. The relative density of RBAO decreased from 96 to 94%, as the amount of Al increased from 15 to 55 vol%. The hardness of RBAO increased from 17.8 to 19.9 GPa and the bending strength enhanced from 370 to 570 MPa, as the amount of Al increased from 15 to 55 vol%. On the other hand, the wear rate of RBAO degraded from 6.7 to 3.39$times$10-5 $textrm{mm}^2$/kg and the fracture toughness decreased from 4.1 to 3.6 MPa.m1/2, as the amount of Al increased from 15 to 55 vol%. Fracture modes were shown to the mixed mode of inter/transgranular. However, transgranular fracture was dominant with increasing the content of Al.
Key words: Reaction bonded alumina, Al, Heating rate, Microstructure, Hardness, Wear rate, Fracture toughness
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