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J. Korean Ceram. Soc. > Volume 42(6); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(6): 443.
doi: https://doi.org/10.4191/kcers.2005.42.6.443
Fracture Behavior of Alumina-Titania-Monazite Composites
Yeong-Kyeun Paek, Tai-Soo Chung
Department of Materials Science and Engineering, Andong National University
ABSTRACT
Fracture behavior was investigated in the $Al_2O_3-TiO_2(3 wt{%})-LaPO_4(25 wt{%}$) composite ceramics. To improve the fracture toughness of alumina ceramics, $TiO_2$ and $LaPO_4$ as a second phase were introduced. The samples were made by conventional powder processing method. Green compacts were sintered at $1600^{circ}C$ for 2 h in air. Fracture toughness was tested using Indentation Strength Bending(ISB) method. From the bending test, enhanced fracture toughness was found in the composite, compared to the pure and $TiO_2$-doped alumina. The main factor of the enhancement of fracture toughness seems to be attributed to the weak interphase role of the $LaPO_4$ as a particulate type.
Key words: Toughness, Fracture behavior, Alumina, Monazite
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