An oscillatory pressure sintering of zirconia powder: Densification trajectories and mechanical properties

2018 ◽  
Vol 101 (5) ◽  
pp. 1824-1829 ◽  
Author(s):  
Yao Han ◽  
Shuang Li ◽  
Tianbin Zhu ◽  
Weiwei Wu ◽  
Di An ◽  
...  



Author(s):  
Jie Zhang ◽  
Tianbin Zhu ◽  
Shaobai Sang ◽  
Yawei Li ◽  
Liping Pan ◽  
...  


2013 ◽  
Vol 686 ◽  
pp. 44-48 ◽  
Author(s):  
Noor Faeizah Amat ◽  
Andanastuti Muchtar ◽  
Norziha Yahaya ◽  
Mariyam Jameelah Ghazali

This study aims to evaluate the effects of sintering temperature on the density and hardness of tetragonal zirconia polycrystals stabilized with 3 mol% 3Y-TZP dental ceramic type. Five cylindrical specimens were fabricated from zirconia powder of particle size 50 nm via colloidal processing. The specimens were sintered densely at the final sintering temperatures of 1000, 1100, 1200, and 1300 °C, respectively. The sintered density and hardness of the sintered specimen were then examined. The results showed that the sintered densities and hardness of the specimen increased as the temperature increased from 1000 °C to 1300 °C. Zirconia 3Y-TZP could gain near full density and reach hardness of as high as 11.30 GPa at the final sintering temperature of 1300 °C. The density and hardness of zirconia structured from 3Y-TZP can be improved by controlling the final sintering temperature.



2017 ◽  
Vol 100 (7) ◽  
pp. 2774-2780 ◽  
Author(s):  
Yao Han ◽  
Shuang Li ◽  
Tianbin Zhu ◽  
Zhipeng Xie




2014 ◽  
Vol 682 ◽  
pp. 109-112
Author(s):  
Sergey Veselov ◽  
N.Yu. Cherkasova ◽  
R.S. Timarevskiy

The results of microstructure and mechanical properties investigation for alumina and zirconia toughened alumina (ZTA) with 20 wt. % 3Y-ZrO2is presented. It was stated that the technique of preliminary treatment for zirconia suspension makes significant influence on sintered specimen microstructure. Introduction of the alloying additive treated with ball milling reduces Al2O3grain size in ceramic from 2-5 μm to 0.2-1 μm. The reduction of grain size increases the bending strength of ceramic material from 270 MPa up to 350 MPa. However fracture toughness of alumina and ZTA is 3.4 and 2.5 MPa·m1/2, respectively. It was shown that the low level of mechanical properties is related to the occurrence of major defects in the form of granule boundaries preserved at the forming stage.









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