TY - JOUR
T1 - Effect of TiO2 addition on the sintering behavior, hardness and fracture toughness of an ultrafine alumina
AU - Wang, Chih Jen
AU - Huang, Chi Yuen
N1 - Funding Information:
This work was supported by TDPA under Ministry of Economic Affairs Taiwan through the program number of 96-EC-17-A-08-S1-023.
PY - 2008/9/25
Y1 - 2008/9/25
N2 - The effect of TiO2 addition (0-4.0 wt%) on the sintering behavior and mechanical properties of an ultrafine (150 nm) alumina-5 wt% zirconia powder has been investigated. TiO2 is a beneficial additive, resulting in lower sintering temperature and higher sintered density. The grain growth is shown to be enhanced simultaneously after TiO2 addition. At higher amounts of TiO2 addition and at higher sintering temperature, the formation of secondary phases of ZrTiO4 or Al2TiO5, which has lower elastic moduli compared with alumina, reduces the hardness of the sintered bulk from 19.3 to 17.9 GPa. The lager grain size and the transition of fracture mode to fully intergranular due to the TiO2 addition seem to improve the toughness from 4.4 to 5.2 MPa m1/2.
AB - The effect of TiO2 addition (0-4.0 wt%) on the sintering behavior and mechanical properties of an ultrafine (150 nm) alumina-5 wt% zirconia powder has been investigated. TiO2 is a beneficial additive, resulting in lower sintering temperature and higher sintered density. The grain growth is shown to be enhanced simultaneously after TiO2 addition. At higher amounts of TiO2 addition and at higher sintering temperature, the formation of secondary phases of ZrTiO4 or Al2TiO5, which has lower elastic moduli compared with alumina, reduces the hardness of the sintered bulk from 19.3 to 17.9 GPa. The lager grain size and the transition of fracture mode to fully intergranular due to the TiO2 addition seem to improve the toughness from 4.4 to 5.2 MPa m1/2.
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U2 - 10.1016/j.msea.2008.04.048
DO - 10.1016/j.msea.2008.04.048
M3 - Article
AN - SCOPUS:47249144064
SN - 0921-5093
VL - 492
SP - 306
EP - 310
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -