| Fracture Behavior of Alumina-Titania-Monazite Composites |
| Yeong-Kyeun Paek, Tai-Soo Chung |
| Department of Materials Science and Engineering, Andong National University |
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| ABSTRACT |
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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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