scholarly journals Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged Laser treated Cubic Versus Tetragonal Zirconia Ceramics

2020 ◽  
Vol 7 (2) ◽  
pp. 213-227
Author(s):  
Shahenda Abdallah ◽  
Inas Motawea ◽  
Mostafa Abdel Ghany ◽  
Rania Amin
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Surface Topography ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramics

The effect of reduction on the mechanical properties of CeO2 doped tetragonal zirconia ceramics

2004 ◽  
Vol 52 (6) ◽  
pp. 1675-1682 ◽  
Author(s):  
M. Matsuzawa ◽  
M. Abe ◽  
S. Horibe ◽  
J. Sakai
Keyword(s):  
Mechanical Properties ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramics

Preparation of Anti-Static Ceramics by Fe-Infiltration on Sintered Zirconia Body

2014 ◽  
Vol 602-603 ◽  
pp. 258-261
Author(s):  
Xian Feng Yang ◽  
Yong Li ◽  
Xie Wen Xu ◽  
Zhi Peng Xie
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Surface Hardness ◽  
Lower Surface ◽  
Processing Method ◽  
Surface Resistivity ◽  
Zirconia Ceramics ◽  
Microstructure Changes ◽  
Infiltration Temperature

Anti-static materials are widely used in the fields of textile, petrochemical processing, aerospace and electronics. An innovative processing method for fabricating anti-static ceramics has been developed based on Fe-infiltration on the sintered zirconia body. The sintered zirconia ceramics infiltrated by metal Fe in the inner atmosphere showed both perfect anti-resistive and mechanical properties. In this study, infiltration temperature and time was optimized to control the surface resistivity. It was shown that the lower surface resistivity could be obtained at higher infiltration temperature and longer infiltration time. However, the surface hardness was decreased. The surface resistivity reached 5.6×107Ω/ at 1300°C for 12 hours. The phase transformation and microstructure changes were characterized by XRD and SEM. The existence state of Fe was analyzed by EDS.

Fabrication, electrical conductivity and mechanical properties of Sc2O3-doped tetragonal zirconia ceramics

1998 ◽  
Vol 111 (1-2) ◽  
pp. 161-169 ◽  
Author(s):  
Masanori Hirano ◽  
Shinzi Watanabe ◽  
Etsuro Kato ◽  
Yasunobu Mizutani ◽  
Masayuki Kawai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramics

scholarly journals Microstructure and Mechanical Properties of Microwave Sintered ZrO2Bioceramics with TiO2Addition

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Hsien-Nan Kuo ◽  
Jyh-Horng Chou ◽  
Tung-Kuan Liu
Keyword(s):  
Mechanical Properties ◽  
Vickers Hardness ◽  
Sintering Temperature ◽  
Tetragonal Zirconia ◽  
Minor Phase ◽  
Zirconia Ceramics ◽  
Xrd Pattern ◽  
Grain Sizes ◽  
Eds Analysis ◽  
Microstructure And Mechanical Properties

The microwave sintered zirconia ceramics with 0, 1, 3, and 5 wt% TiO2addition at a low sintering temperature of 1300°C and a short holding time of 1 hour were investigated. Effect of contents of TiO2addition on microstructure and mechanical properties of microwave sintered zirconia bioceramics was reported. In the sintered samples, the main phase is monoclinic zirconia (m-ZrO2) phase and minor phase is tetragonal zirconia (t-ZrO2) phase. The grain sizes increased with increasing the TiO2contents under the sintering temperature of 1300°C. Although the TiO2phase was not detected in the XRD pattern, Ti and O elements were detected in the EDS analysis. The presence of TiO2effectively improved grain growth of the ZrO2ceramics. The Vickers hardness was in the range of 125 to 300 Hv and increased with the increase of TiO2contents. Sintering temperature dependence on the Vickers hardness was also investigated from 1150°C to 1300°C, showing the increase of Vickers hardness with the increase of the sintering temperature as well as TiO2addition.

Effect of Short Time Sintering on the Mechanical Properties of Undoped Zirconia Ceramics

2014 ◽  
Vol 629 ◽  
pp. 420-425 ◽  
Author(s):  
Sivanesan Sivakumar ◽  
Ramesh Singh ◽  
Hsien Loong Teow ◽  
Yong Leng Chuan ◽  
Jeffrey Kong Chin Leong
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tetragonal Zirconia ◽  
Matrix Stiffness ◽  
Zirconia Ceramics ◽  
High Relative Density ◽  
The Matrix ◽  
The Many ◽  
Short Time ◽  
Critical Grain Size

Sintering parameters are undoubtedly among the many factors that influence the mechanical properties and hydrothermal ageing resistance of tetragonal zirconia ceramics. In this research, the effect of using short holding times i.e. (1 min., 30 min. and 1 hour) as compared to the conventional 2 hours during sintering of 3 mol% Yttria Tetragonal Zirconia Polycrystals (3Y-TZP) on the mechanical properties were systematically investigated. The research revealed that holding time of 1 minute and sintered at 1400oC yielded a high relative density (above 95% of theoretical density) and high Young’s modulus (above 180 GPa) without compromising on tetragonal phase stability and mechanical properties. The study also revealed that the bulk density is an important parameter governing the matrix stiffness of 3Y-TZPs and that grain size strongly influences the transformability and consequently, the toughness of 3Y-TZPs. The toughness of the ceramic was observed to increase steeply when grains exceeded 0.52 µm, which has been identified as the critical grain size for toughening.

Surface and Mechanical Characterization of Dental Yttria-Stabilized Tetragonal Zirconia Polycrystals (3Y-TZP) After Different Aging Processes

2016 ◽  
Vol 22 (6) ◽  
pp. 1179-1188 ◽  
Author(s):  
Palena A. Pinto ◽  
Guillaume Colas ◽  
Tobin Filleter ◽  
Grace M. De Souza
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Clinical Performance ◽  
Tetragonal Zirconia ◽  
Surface Hardness ◽  
Compositional Analysis ◽  
Hydrothermal Aging ◽  
Experimental Conditions ◽  
Force Microscopy ◽  
Chewing Simulation

AbstractYttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) is a ceramic material used in indirect dental restorations. However, phase transformation at body temperature may compromise the material’s mechanical properties, affecting the clinical performance of the restoration. The effect of mastication on 3Y-TZP aging has not been investigated. 3Y-TZP specimens (IPS E-max ZirCAD and Z5) were aged in three different modes (n=13): no aging (control), hydrothermal aging (HA), or chewing simulation (CS). Mechanical properties and surface topography were analyzed. Analysis of variance showed that neither aging protocol (p=0.692) nor material (p=0.283) or the interaction between them (p=0.216) had a significant effect on flexural strength, values ranged from 928.8 MPa (IPSHA) to 1,080.6 MPa (Z5HA). Nanoindentation analysis showed that material, aging protocol, and the interaction between them had a significant effect (p<0.001) on surface hardness and reduced Young’s modulus. The compositional analysis revealed similar yttrium content for all the experimental conditions (aging: p=0.997; material: p=0.248; interaction material×aging: p=0.720). Atomic force microscopy showed an effect of aging protocols on phase transformation, with samples submitted to CS exhibiting features compatible with maximized phase transformation, such as increased volume of the material microstructure at the surface leading to an increase in surface roughness.

Mechanical Properties and Thermal Stability of Yttria-Doped Tetragonal Zirconia Polycrystals with Diffused Ceria in the Surface

1986 ◽  
Vol 78 ◽  
Author(s):  
T. Sato ◽  
S. Ohtaki ◽  
T. Fukushima ◽  
T. Endo ◽  
M. Shimada
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Phase Transformation ◽  
Fracture Strength ◽  
Monoclinic Phase ◽  
Bending Strength ◽  
Tetragonal Zirconia ◽  
The Body ◽  
Surface Alloying ◽  
Thermal Stability Of

ABSTRACTYttria-doped tetragonal zirconia polycrystals (Y-TZP) containing 2 and 3 mol% of Y2O3 uniformly alloyed by 0-15 mol% of CeO2 or diffusing CeO2 on the surface were fabricated, and the mechanical properties and thermal stability of the sintered bodies were evaluated by annealing in humidity conditions at 50–600° C. The tetragonal-to-monoclinic phase transformation proceeded at 100–500°C in air, and accompanied microcracks. The phase transformation proceeded rapidly on the surface, but slowly inside the body. The bending strength of the annealed specimens depended on the depth of the transformation layer thickness, but not on the degree of the phase transformation on the surface. Alloying CeO2 was useful to improve the thermal stability of Y-TZP, but noticeably decreased the fracture strength. Diffusing CeO2 on the suface of Y-TZP seemed to be useful to improve the thermal stability without loss of the fracture strength.

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