Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process

Park, Sun Hyo; Ryu, In Young; Lee, Won Jun; Kim, Dae Joon; Han, Jung Suk; Lee, Myung Hyun

doi:10.4028/www.scientific.net/SSP.124-126.1293

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HomeSolid State PhenomenaAdvances in Nanomaterials and ProcessingSinterbility and Mechanical Properties of Zirconia...

Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process

Abstract:

A hydrothermal method has been used to produce nanoparticles of 3 mol% yttria-stabilized tetragonal zirconia (3Y-TZP) with high fracture toughness. The effects of reaction temperature and pH on crystallite size and sintered density, and the influence of Nb2O5 addition into 3Y-TZP on toughness have been investigated. The particle size increased with increasing the processing parameters and the influence of temperature was more significant than pH. The density of nanosized 3Y-TZP increased with increasing pH up to 9 and then decreased abruptly with further increase. The density increased slightly with the reaction temperature up to 140°C and then changed little with increasing temperature. The toughness increased in proportional to the Nb2O5 content. After sintering for 1 h at 1270°C, the highest relative density of 98% was obtained from nanoparticles of about 17 nm, prepared at 200°C and pH 9, and the toughness of 3Y-TZP was increased from 2.5 to 8.3 MPam1/2 by addition of 1.2 mol% Nb2O5.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Main Theme:

Advances in Nanomaterials and Processing

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

1293-1296

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.1293

Citation:

S. H. Park et al., "Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process", Solid State Phenomena, Vols. 124-126, pp. 1293-1296, 2007

Online since:

June 2007

Authors:

Sun Hyo Park, In Young Ryu, Won Jun Lee, Dae Joon Kim, Jung Suk Han, Myung Hyun Lee

Keywords:

Fracture Toughness, Hydrothermal Synthesis, Nanoparticle, Zirconia

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Paper TitlePages

Preparation of Zirconia Nanopowders in Ultrasonic Field by the Sol-Gel Method

Authors: Xiao Xi Li, Ling Chen, Bing Li, Lin Li

Abstract: Zirconia nanopowders were prepared in the ultrasonic field by the sol-gel method and the sonochemical effect on the structure of zirconium hydroxide and the zirconia nanopowder properties were systematically investigated in this work. Ultrasound was introduced into the different stages of the synthesis of zirconia nanopowders in sol-gel reaction system, and zirconium hydroxides and the zirconia nanopowders with different properties were obtained. The results indicated that ultrasonic cavitation could not only disaggregate the agglomerates of zirconia colloidal particles but also reduce the amount of coordinated H2O, free H2O and free hydroxyl groups of the zirconium hydroxide colloidal particles, thus effectively preventing the formation of hard agglomerates in zirconia powders. Moreover, the effects of different ultrasonic output powers and treatment cycles on the structure and properties of ZrO2 nanopowders were studied by TEM, XRD and SAXS. Zirconia nanopowders with an extremely small crystallite size (10.3 nm) and a narrow size distribution were yielded with 520 W ultrasound for 6 treatment cycles on the formation period and 600 W ultrasound for 2 treatment cycles on the washing period. It is concluded that the ultrasonic field is a potential method for nanopowder preparation.

981

Fabrication of Porous Ni-ZrO₂ for SOFC Using NiO-ZrO₂ Composite Powders

Authors: K. Sato, Sawao Honda, T. Nishikawa, Hideo Awaji

Abstract: Porous NiZrO2 has been widely used as anode in SOFC. However, it has been reported that there was reduction in cell performance at high temperature since Ni grains in the porous Ni ZrO2 sintered during cell operation. In this study, NiOZrO2 composite powders in which NiO powder were covered with ZrO2 particles were prepared with controlled microstructure of porous NiZrO2 which can prevent sintering of Ni grains during cell operation. NiOZrO2 composite powders (HNZ) were prepared using NiO powder of high specific surface area and ZrO2 sol of average particle size of 50 nm by ball milling (sol-coating method). SEM and EPMA analysis of prepared NiOZrO2 composite powders showed that NiO particles were covered with ZrO2 particles. The crystallite phases, crystallite sizes, BET specific surface area of NiOZrO2 composite powders and porosities of fabricated porous NiZrO2 were characterized. SEM and EPMA analysis showed that ZrO2 was distributed around Ni of a few μm range in the porous Ni ZrO2 (HNZ) fabricated by the sol-coating method. Mechanical properties of porous NiZrO2 (HNZ) are required to be improved.

705

Mechanochemical Reduction of MoO₃ Powder by Silicone to Synthesize Nanocrystalline MoSi₂

Authors: H. Ramezanalizadeh, Saeed Heshmati-Manesh

Abstract: Molybdenum disiliside is known as a ceramic material with attractive properties for high temperature structural applications. In this study, mechanical alloying was used to produce MoSi2 powder directly from molybdenum oxide. Mixture of MoO3 and Si powders with commercial purity were exposed to high mechanical activation in a planetary ball mill. The ball to powder mass ratio was selected to be constant at 33:1 and the rotation speed (cup speed) was 600 rpm during the milling operations. Crystallite sizes and structural evolutions during milling were investigated by Xray diffraction analysis. The morphology of the mechanically alloyed powders was evaluated with scanning electron microscope (SEM). From XRD results, it was observed that within 6 hours of milling MoO3 was reduced and fully converted to MoO2. After 17 hours of milling MoO2 also began to reduce and peaks of MoSi2 (both and phases) and Mo were detected. Further milling resulted in a gradual decrease in MoO2 peak intensities because of its continuous reduction. Peaks of MoO2 were also broadened due to refinement of MoO2 crystallite sizes. Scherrer and Williamson-Hall methods using XRD patterns were employed to calculate the mean crystallite size. Calculations indicated that in the sample ball milled for 50 hours, MoSi2 crystallite sizes were less than 100 nm.

1364

Effect of Hydrothermal Temperatures on the Structure of Bi_0.5Na_0.5TiO₃ Nanomaterials

Authors: Xiao Li Zhang, Wei Ping Tang, Hai Yan Wu, Bing Bing Zhang, Xiu Cheng Zheng

Abstract: Bismuth sodium titanate (Bi_0.5Na_0.5TiO₃ , abbreviated as BNT) nanoparticles were synthesized by hydrothermal process at various temperatures for 10 h. The results showed that all the as-prepared nanopowders are well crystallized and the crystallite size increased with the increase of hydrothermal temperatures under the reaction conditions.

2573

The Effects of Combustion Agents on the Formation of Bi-Based Compounds Synthesized Using the Soft Combustion Method

Authors: Khairunisak Abdul Razak, Mohamad Afifi Anuar, Chai Yan Ng

Abstract: In this work, 20 % Pr doped bismuth sodium titanate (PBNT) powders were synthesized using the soft combustion technique. Three combustion agents; polyethylene glycol 200, citric acid and glycine with 0.2, 2.0 and 5.0 mol were used to aid combustion process. A single phase PBNT was obtained with the addition of 5 mol % citric acid. For most compounds, secondary phases presence such as Bi₄Ti₃O₁₂ and Bi₂Ti₂O₇. In general, crystallite size increased with increasing sintering temperature that was due to diffusion of ions at high temperature. Dielectric properties increased with increasing densities. The optimum properties were obtained for PBNT synthesized using 5 mol % citric acid sintered at 1100°C for 3 hours which gave the highest dielectric constant (1153.20), acceptable loss tangent (0.1074) and high relative density (95.03).

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