Low-temperature degradation in yttria-stabilized tetragonal zirconia polycrystal: effect of Y3+ distribution in grain interiors

2022 ◽  
pp. 117659
Author(s):  
Koji Matsui ◽  
Kazuto Nakamura ◽  
Mitsuhiro Saito ◽  
Akihide Kuwabara ◽  
Hidehiro Yoshida ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Tetragonal Zirconia Polycrystal

Transformation behavior of yttria stabilized tetragonal zirconia polycrystal–TiB2 composites

2001 ◽  
Vol 16 (7) ◽  
pp. 2158-2169 ◽  
Author(s):  
B. Basu ◽  
J. Vleugels ◽  
O. Van Der Biest
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Mechanical Analysis ◽  
Transformation Behavior ◽  
Thermal Expansion Data ◽  
Thermally Induced ◽  
First Time ◽  
Tetragonal Zirconia Polycrystal

The objective of the present article is to study the influence of TiB2 addition on the transformation behavior of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). A range of TZP(Y)–TiB2 composites with different zirconia starting powder grades and TiB2 phase contents (up to 50 vol%) were processed by the hot-pressing route. Thermal expansion data, as obtained by thermo-mechanical analysis were used to assess the ZrO2 phase transformation in the composites. The thermal expansion hysteresis of the transformable ceramics provides information concerning the transformation behavior in the temperature range of the martensitic transformation and the low-temperature degradation. Furthermore, the transformation behavior and susceptibility to low-temperature degradation during thermal cycling were characterized in terms of the overall amount and distribution of the yttria stabilizer, zirconia grain size, possible dissolution of TiB2 phase, and the amount of residual stress generated in the Y-TZP matrix due to the addition of titanium diboride particles. For the first time, it is demonstrated in the present work that the thermally induced phase transformation of tetragonal zirconia in the Y-TZP composites can be controlled by the intentional addition of the monoclinic zirconia particles into the 3Y-TZP matrix.

Low-temperature degradation and defect relationship in yttria-tetragonal zirconia polycrystal ceramic

2014 ◽  
Vol 18 (sup6) ◽  
pp. S6-131-S6-134 ◽  
Author(s):  
U. Sutharsini ◽  
S. Ramesh ◽  
J. Purbolaksono ◽  
C. Y. Tan ◽  
W. D. Teng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Tetragonal Zirconia Polycrystal

scholarly journals Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal)

2020 ◽  
Vol 39 (4) ◽  
pp. 577-586 ◽  
Author(s):  
Katsunori FURUYA ◽  
Shinji TAKEMOTO ◽  
Shuichiro YAMASHITA ◽  
Hideshi SEKINE ◽  
Yasutomo YAJIMA ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tetragonal Zirconia ◽  
High Strength ◽  
Tetragonal Zirconia Polycrystal

scholarly journals Effect of Different Surface Treatments on Biaxial Flexural Strength of Yttria-stabilized Tetragonal Zirconia Polycrystal

2018 ◽  
Vol 19 (3) ◽  
pp. 318-323
Author(s):  
Teerthesh Jain ◽  
Amit Porwal ◽  
Sumanth Babu ◽  
Zahid A Khan ◽  
Chandeep Kaur ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flexural Strength ◽  
Tetragonal Zirconia ◽  
Surface Treatments ◽  
Control Group ◽  
Significant Difference ◽  
Biaxial Flexural Strength ◽  
Computer Aided ◽  
The Impact ◽  
Tetragonal Zirconia Polycrystal

ABSTRACT Introduction Ceramics are widely applied in dentistry owing to their excellent mechanical and physical attributes. The most popular ceramics are Lava™, KaVo Everest, and Cercon. However, it is unclear whether or not a different surface treatment along with low-temperature aging and mechanical loading (ML) affects the physical properties of computer-aided design (CAD)/computer-aided manufacturing (CAM)-machined yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. Aim The objective of this research was to assess the impact of various surface treatments as air-particle abrasion, ML, low-temperature degradation (LTD), and their cumulative effects on biaxial flexural properties of Y-TZP. Materials and methods Totally, 50 specimens were fabricated by CAD–CAM machining from Cercon® and divided into five groups following different surface treatments as control (C), air-particle abrasion (Si), ML, LTD, and cumulative treatment (CT) group. Results were investigated by two-way analysis of variance (ANOVA) and Tukey honest significant difference (HSD) test. Results The highest biaxial flexural strength was observed in the Si group (950.2 ± 126.7 MPa), followed by the LTD group (861.3 ± 166.8 MPa), CT group (851.2 ± 126.5 MPa), and the least with ML (820 ± 110 MPa). A significant difference was observed in the two-way ANOVA test. X-ray diffraction (XRD) analysis showed that the control group consists of 100% tetragonal zirconia and the maximum amount of monoclinic phase was obtained after LTD. Conclusion No negative effect on biaxial flexural strength was observed; indeed, it increases the biaxial strength. Hence, these surface treatments can be done in routine clinical practice to improve the performance of ceramic restoration. How to cite this article Jain T, Porwal A, Babu S, Khan ZA, Kaur C, Jain RB. Effect of Different Surface Treatments on Biaxial Flexural Strength of Yttria-stabilized Tetragonal Zirconia Polycrystal. J Contemp Dent Pract 2018;19(3):318-323.

Low Temperature Degradation of Yttria Stabilized Zirconia

2007 ◽  
Vol 336-338 ◽  
pp. 1188-1189 ◽  
Author(s):  
Zheng Lan Lu ◽  
Dan Yu Jiang ◽  
Lei Hu ◽  
Guo Qiang Zhu ◽  
Qiang Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Xrd Analysis ◽  
Phase Identification ◽  
Stabilized Zirconia ◽  
Aging Behavior ◽  
Dopant Content ◽  
Microscope Imaging ◽  
Co Precipitation ◽  
Tetragonal Zirconia Polycrystal

This paper explores the effects of dopant content on the aging behavior of tetragonal zirconia polycrystal (TZP). TZP powders with varying Y2O3 content (1.75-3mol%) were synthesized by co-precipitation. After the green body of as-prepared TZP powders being isostatically pressed at 200 MPa and sintered at 14000C for 3 h in air, a range of TZP ceramics were fabricated. As-synthesized TZP ceramics annealed at relatively low temperatures with the presence of water or water vapor. XRD analysis was conducted for phase identification and determined a tetragonal to monoclinic transformation. Microscope imaging displayed the changes of aged TZP surface structure. It is believed that the degradation of TZP might be caused by the reaction between Y2O3 and H2O. The mechanism of low temperature degradation of TZP was discussed.

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