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Effect of TiO2 addition on the sintering behavior, hardness and fracture toughness of an ultrafine alumina

โœ Scribed by Chih-Jen Wang; Chi-Yuen Huang

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
655 KB
Volume
492
Category
Article
ISSN
0921-5093

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โœฆ Synopsis

The effect of TiO 2 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. TiO 2 is a beneficial additive, resulting in lower sintering temperature and higher sintered density. The grain growth is shown to be enhanced simultaneously after TiO 2 addition. At higher amounts of TiO 2 addition and at higher sintering temperature, the formation of secondary phases of ZrTiO 4 or Al 2 TiO 5 , 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 TiO 2 addition seem to improve the toughness from 4.4 to 5.2 MPa m 1/2 .

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