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

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

scholarly journals Electrical and Mechanical Properties of ZrO2-Y2O3-Al2O3 Composite Solid Electrolytes

2021 ◽  
Author(s):  
M. Lubszczyk ◽  
J. Wyrwa ◽  
K. Wojteczko ◽  
J. Pleśniak ◽  
M. M. Bućko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Electrochemical Impedance ◽  
Tetragonal Zirconia ◽  
Solubility Limit ◽  
Hydrogen Energy ◽  
Efficient Operation ◽  
Al2o3 Composite ◽  
Indentation Tests ◽  
Co Precipitation

AbstractStrategic priorities in the field of hydrogen energy include the design of intermediate-temperature solid oxide fuel cells capable of highly efficient operation in the temperature range of 573–973 K. Consequently, attempts are being made to replace the widely applied cubic zirconia electrolyte with an electrolyte consisting of tetragonal zirconia. The rationale for this approach is that 3Y-TZP exhibits higher mechanical strength and higher electrical conductivity at temperatures below 973 K. The addition of Al2O3 in an amount that exceeds its solubility limit in 3Y-TZP has been found to result in increased electrical conductivity and improved mechanical properties. The aim of the study was to synthesize 3-YSZ powder via co-precipitation and use it to obtain composites with a 3Y-TZP matrix and 0.5 mol.% or 1.0 mol.% of Al2O3 inclusions. The correlation between these samples' electrical conductivity and resistance to brittle fracture and their phase composition and microstructure was investigated by means of X-ray diffractometry, scanning electron microscopy, electrochemical impedance spectroscopy and Vickers indentation tests. For comparison, the properties of composites with an 8-YSZ matrix and Al2O3 inclusions were also investigated. It was determined that the composite based on the 3Y-TZP matrix and containing 0.5 mol.% of Al2O3 inclusions can be considered a viable alternative for 8-YSZ electrolytes in IT-SOFC applications.

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.

PREPARATION OF DENSE TETRAGONAL ZIRCONIA CERAMICS FROM ZrO2 MICROPOWDERS

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-237-C1-241
Author(s):  
A. SMITH ◽  
B. CALES ◽  
J. F. BAUMARD
Keyword(s):  
Tetragonal Zirconia ◽  
Zirconia Ceramics

Polypyrrole/PU hybrid hydrogels: electrically conductive and fast self-healing for the potential application in body-monitor sensor

2021 ◽  
Author(s):  
Zhanyu Jia ◽  
Guangyao Li ◽  
Juan Wang ◽  
shouhua Su ◽  
Jie Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Potential Application ◽  
Self Healing ◽  
Electrically Conductive ◽  
Sensor Application ◽  
Hybrid Hydrogels ◽  
Health Monitor

Conductivity, self-healing and moderate mechanical properties are necessary for multifunctional hydrogels which have great potential in health-monitor sensor application. However, the combination of electrical conductivity, self-healing and good mechanical properties...

scholarly journals Effect of SWCNT-Tuball Paper on the Lightning Strike Protection of CFRPs and Their Selected Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3140
Author(s):  
Kamil Dydek ◽  
Anna Boczkowska ◽  
Rafał Kozera ◽  
Paweł Durałek ◽  
Łukasz Sarniak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Copper Foil ◽  
Impact Resistance ◽  
Mechanical Analysis ◽  
Lightning Strike ◽  
Single Wall Carbon Nanotubes ◽  
Carbon Fibre Reinforced Polymer ◽  
The Impact

The main aim of this work was the investigation of the possibility of replacing the heavy metallic meshes applied onto the composite structure in airplanes for lightning strike protection with a thin film of Tuball single-wall carbon nanotubes in the form of ultra-light, conductive paper. The Tuball paper studied contained 75 wt% or 90 wt% of carbon nanotubes and was applied on the top of carbon fibre reinforced polymer before fabrication of flat panels. First, the electrical conductivity, impact resistance and thermo-mechanical properties of modified laminates were measured and compared with the reference values. Then, flat panels with selected Tuball paper, expanded copper foil and reference panels were fabricated for lightning strike tests. The effectiveness of lightning strike protection was evaluated by using the ultrasonic phased-array technique. It was found that the introduction of Tuball paper on the laminates surface improved both the surface and the volume electrical conductivity by 8800% and 300%, respectively. The impact resistance was tested in two directions, perpendicular and parallel to the carbon fibres, and the values increased by 9.8% and 44%, respectively. The dynamic thermo-mechanical analysis showed higher stiffness and a slight increase in glass transition temperature of the modified laminates. Ultrasonic investigation after lightning strike tests showed that the effectiveness of Tuball paper is comparable to expanded copper foil.

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