Thermal Properties and Phase Transformation of 2 mol% Y2O3-PSZ Nanopowders Prepared by a Co-precipitation Process |
| |
Authors: | Huey-Er Lee Yu-You Sie Ju-Hui Wu Weng Sing Hwang Wang-Long Li |
| |
Institution: | a Faculty of Dentistry, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwanb Department of Prosthodontics, Kaohsiung Medical University Hospital, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwanc Department of Family Dentistry, Kaohsiung Medical University Hospital, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwand Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwane Department of Electrical Engineering, Cheng Shiu University, 840 Cheng Ching Road, Niaosong, Kaohsiung 83347, Taiwanf Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwang Department of Fragrance and Cosmetics Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan |
| |
Abstract: | Two mol% Y2O3-PSZ precursor powders for dental applications were synthesized using ZrOCl2·8H2O and Y(NO3)3·6H2O by a co-precipitation process at pH 7 and 348 K for 2 h. The thermal properties and phase transformation of 2Y-PSZ nanocrystallite powder have been investigated using a thermogravimetric and difference scanning calorimeter (TG/DSC), Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy (TEM), selected area electron diffraction and dilatometric analysis. Two weaker broad exothermic peaks appear at around 618 and 718 K were explored in DSC results. The TG analysis shows that minor weight loss occurs from 298 to 348 K, followed by three major weight losses at 610, 630 and 773 K. Calcinated at 773 and 1273 K, the crystallized phases are composed of the major phase of tetragonal ZrO2 and minor phase of monoclinic ZrO2. TEM reveals that the tetragonal ZrO2 with an average size of less than 20.0 nm is mainly aggregated into the secondary aggregates with a size of small than 30.0 nm. The sintering curve of the compact pellet has a significant shrinkage with a linear rate of 18.5% at about 1341 K. Maximum densification rate happened at 1473 K, demonstrating the good low temperature sinterability for dental applications. |
| |
Keywords: | 2Y-PSZ Sintering Structure Thermal properties TEM |
本文献已被 ScienceDirect 等数据库收录! |
|