Preparation of Fine, Spherical Yttria‐Stabilized Zirconia by the Spray‐Pyrolysis Method

Dubois, B.; Ruffier, D.; Odier, P.

doi:10.1111/j.1151-2916.1989.tb06206.x

Cited by 63 publications

(20 citation statements)

References 5 publications

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“…In contrast to previous literature [8,10], powder analyses showed that the spheres had a core-shell structure, with a hard exterior and porous interior. Such hollow structures have not been reported previously but are theoretically highly suitable for TBCs due to improved heat insulation capabilities.…”

Section: Introductioncontrasting

confidence: 45%

“…Consistently with SEM, the samples produced at 1100°C show stronger contrast, suggesting denser aggregates forming the sphere as compared to the sample prepared at 700°C. However, both samples did not present a highly dense interior [10] (which would not have allowed electron transmittance). This suggests that the heating rates of the liquid droplets were fast enough to cause precipitation from the edges of the droplets, creating a precipitation front moving inwards.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

et al. 2017

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A B S T R A C THigh yield synthesis of yttria-stabilized zirconia (YSZ) porous microspheres can enable application in advanced thermal barrier coatings, exploiting reflective properties originated from high temperature photonics. The complexity of typical wet-chemistry processes utilized in microspheres manufacturing limits yield and can hardly deliver stable porous structures. Here, ultrasonic spray pyrolysis was utilized to produce high quantities of porous YSZ. Droplets of an aqueous precursor solution were dragged with continuous air flow into a furnace kept at temperatures varying from 700 to 1200°C. Spherical fully cubic zirconia particles were obtained in all processing conditions, and the sizes of the spheres decreased as a function of the processing temperature, ranging from 484 to 373 nm (average diameters), while their crystallite sizes had an inverse trend, ranging from 4.9 to 25.2 nm. This was attributed to higher temperatures activating coarsening of the spheres.

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Section: Introductioncontrasting

confidence: 45%

Section: Resultsmentioning

confidence: 99%

Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

et al. 2017

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“…The average particle size is 0.78 jam and the standard deviation, cyn(cy . = 1 + ~/d [13], where d is the average particle size), is 1.41, respectively. The particle-size distribution of YBa2CuaOv_ x powder synthesized by the USP method has been seldom reported.…”

Section: Particle-size Distribution Of Yba2cu307_ X Powdermentioning

confidence: 99%

Preparation and characterization of YBa2Cu3O7−x powder by the ultrasonic spray pyrolysis method

Kim

1991

J Mater Sci

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A single-phase YBa2Cu307_ x powder was prepared in an air flow system by thermally decomposing droplets containing the nitrate salts of yttrium, barlum and copper in distilled water. The powder obtained had a mean particle size 0.78 gm and a very narrow particle size distribution. The total porosity of the powder was estimated to be about 63%. It was found that much agglomeration had occurred among the droplets, which would have an adverse effect on the particle size distribution. The bulk density of a sintered specimen using the powder prepared at 950 ~ was higher than 97% theoretical density.

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“…At the same time, this method has a number of drawbacks, the main of which is its low selectivity. The broad size distribution of particles produced by the plasma pyrolysis of liquid precursors is due not only to aggregation but also to the large difference in geometry between individual particles [10,11]. Ultrafine ZrO 2 -3wt.%MgO powder was used in the present studies.…”

Section: Methodsmentioning

confidence: 99%

Structure and mechanical properties of ZrO2-based systems

Kulkov¹,

Buyakova²,

Gömze³

2014

Epitoanyag - JSBCM

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the structure and phase composition of zirconia-based nanosystems are studied. it is shown that during mechanical activation this nanosystem is divided into two subsystems with the average size of structural elements differing by two orders of magnitude. the fraction of the quasiamorphous (X-ray amorphous) phase therewith increases. through varying the heating rate of such a nanosystem in sintering we may purposefully vary its shrinkage at the stage of isothermal sintering. it is shown that through heating rate variation at sintering of such a nanosystem one can purposefully vary its shrinkage at the isothermal sintering stage. the higher the sintering temperature, the slower the compaction process at the isothermal stage. this allows producing materials with various porosity values but high strength of sintered material. keywords: ceramics, mechano-chemistry, nanostructure, nanocrystalline zro 2 , phase composition, sinteringProf. Sergey N. Kulkov Head of Department of ceramics in the institute of strength Physics and materials science of the russian Academy of science since 1989. He has got scientific degrees "candidate of Physics and mathematical sciences" at tomsk state university in 1981; and "Doctor of Physics and mathematical sciences" in 1990. since 1992 he's working as professor both in tomsk state university and in tomsk Polytechnic university. He has a wide range experiments in research of structural ceramic composites and in development of new material composition and technology of high-tech products. His research works are represented in 5 books, more than 150 articles, 18 patents and many international symposiums and conferences. in 1997 he had a soros Professor grant. At present he is head of chair "theory of strength and mechanic of solids", member of "the American ceramic society" of "the APmi-international" and the DymAt society (France). His scientific activities are the followings: ceramic matrix composites with transformation toughening, transformations and mechanical properties, shockwave treatment of ceramic powders, superplasticity of cmc, ceramic and ceramic reinforced metal fiber with high porosity for medical applications.Prof. Svetlana P. Buyakova Doctor of sciences from 2008, full Professor from 2013. she is specialist in material sciences of ceramic and ceramic matrix composites based on oxides and carbides. she is author and co-author more than 100 papers. three Ph.D. students and one person makes they dissertations under her guidance in period 2010-2013. now, she is chief scientist in isPms rAs and professor in tomsk state university and tomsk Polytechnic university. Her teaching experience: introduction to materials science, Fundamentals of materials engineering, materials and their Applications.Prof. László A. Gömze establisher (in july 1st, 1999) and head of Department of ceramics and silicate engineering in the university of miskolc, Hungary. since then 7 students from the department have successfuly completed their PhD theses and 4 of them were managed by Prof. Gömze...

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Preparation of Fine, Spherical Yttria‐Stabilized Zirconia by the Spray‐Pyrolysis Method

Cited by 63 publications

References 5 publications

Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

Preparation and characterization of YBa2Cu3O7−x powder by the ultrasonic spray pyrolysis method

Structure and mechanical properties of ZrO2-based systems

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