Effect of thermal treatment on the crystal structure and morphology of zirconia nanopowders produced by three different routes

Rashad, M.M.; Baioumy, Hassan

doi:10.1016/j.jmatprotec.2007.04.135

Cited by 93 publications

(37 citation statements)

References 37 publications

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“…At low temperature, above 300 °C, the transformation of the amorphous phase into the meta-stable tetragonal phase is presented. Although this phase is stable at temperature range between 1100 °C and 2370 °C, it is obtained at low temperature due to the great loss of structural water from the amorphous [9]. After the synthesis of ZrO 2 stabilized with Yttria, the morphology and phase composition were studied by SEM and XRD.…”

Section: Sol-gel Technique With Natural Precipitationmentioning

confidence: 99%

Synthesis and characterization of Zirconia- Yttria nanoparticles in t’ phase by sol-gel and spray drying

Torres¹,

Zárate‐Medina²,

García³

2016

Epitoanyag - JSBCM

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the synthesis of zirconia-yttria nanoparticles in phase t', non-transformable tetragonal phase of the zirconia, is important for the reinforcement of different ceramic matrixes with nanometric and submicronic structures, in order to enhance the mechanical resistance of the composite obtaining a better and homogeneus stress distribution. the objective of this research is to obtain the phase t' by sol-gel synthesis and spray drying of the gel suspension. the precursors used in this study were: zirconium oxychloride octa-hydrate and yttrium oxide which was dissolved in hydrochloric acid and water, after salts hydrolysis, the suspension subsequently undergo to spray drying and the obtained spherical nanostructured aggregates were calcined at 650 °c. non transformable tetragonal composition employed was 7.5ysz (7.5% mol yo 1.5 ), according to the equilibrium diagram of zro 2 -yo 1.5 system. the products obtained were characterized by XrD and sem, verifying obtaining the phase t' and analyzing the microstructure of the obtained particles. From XrD results, it was determined that calcination temperature was enough for the obtention of the t' phase. its results were compared with obtained by controlled precipitation route of the same composition at high temperatures. keywords: yttria stabilized zirconia nanoparticles, sol gel -spray drying process, non transformable tetragonal phase t'

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Section: Sol-gel Technique With Natural Precipitationmentioning

confidence: 99%

Synthesis and characterization of Zirconia- Yttria nanoparticles in t’ phase by sol-gel and spray drying

Torres¹,

Zárate‐Medina²,

García³

2016

Epitoanyag - JSBCM

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“…Zirconia ZrO2 is an oxide which has a high tensile strength, high hardness and corrosion resistance. Zirconia based ceramics are routinely used in structural applications in engineering, such as manufacture of cutting tools [11]. In this investigation we are prepared thick film ternary hybrid composite PMMA, and study their structure properties (XRD, AFM) ,electrical properties (D.C conductivity, D.C resistivity, activation energy) and dielectric properties (dielectric constant, loss tangent, A.C conductivity).…”

Section: Introductionmentioning

confidence: 99%

Structural, Electrical and Dielectric Properties of Ternary Hybrid PMMA Composite

Al-Khafaji¹,

Hussein²

2016

JNUS

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This study aims to synthesis ternary hybrid composite PMMA polymer matrix with TiO2, Al2O3 and ZrO2 as additives using casting technique. Range of weight fractions (84-92 wt %) of Poly (methyl methacrylate), fixed percentage (4%) of TiO2 and range of weight fractions (4-12 wt %) of Al2O3 and ZrO2 were used as started materials. Structure characterization was examined through XRD and AFM. Obtained micrograph revealed homogeneity structure and XRD pattern display present of crystals for ZrO2. Dielectric properties like dielectric constant were carried out for range (10 2 -10 6 ) Hz frequency .The addition of Alumina filler exhibit slightly effect on values of dielectric constant for prepared ternary hybrid composite (PMMA-TiO2-Al2O3) compared with ZrO2 for ternary hybrid composite (PMMA-TiO2-ZrO2) which dielectric constant increase as concentration . Dissipation factor decrease with increasing frequency in composite of alumina and zirconia but in case the later yield good compatible. D.C electrical conductivity was conducted at temperature range (313-373) K. Markedly increasing of the D.C electrical conductivity for Zirconia filler respect to addition concentration and applied temperature.

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“…Zirconia based ceramics are routinely used in structural applications in engineering, such as in the manufacture of cutting tools, gas sensors, refractories and structural opacifiers. (Rashad & Baioumy, 2008). To meet structural demands, zirconia is doped with stabilizers to achieve high strength and fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

Application of Zirconia in Dentistry: Biological, Mechanical and Optical Considerations

Volpato¹,

Garbelotto²,

Fredel³

et al. 2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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Effect of thermal treatment on the crystal structure and morphology of zirconia nanopowders produced by three different routes

Cited by 93 publications

References 37 publications

Synthesis and characterization of Zirconia- Yttria nanoparticles in t’ phase by sol-gel and spray drying

Synthesis and characterization of Zirconia- Yttria nanoparticles in t’ phase by sol-gel and spray drying

Structural, Electrical and Dielectric Properties of Ternary Hybrid PMMA Composite

Application of Zirconia in Dentistry: Biological, Mechanical and Optical Considerations

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