Ultrafine particles of the ZrO2-SiO2 system prepared by the spray-ICP technique

Ono, Tomoshige; Kagawa, M.; Syono, Yasuhiko

doi:10.1007/bf00556078

Cited by 44 publications

(13 citation statements)

References 11 publications

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“…Pure SiO2 particles were found to crystallize when heated above 1273 K for 2 h (recognized through the strong X-ray reflection at 20 = 21.9 ° due to the cristobalite structure). The crystallization of SiO2 appears to occur at a somewhat lower temperature in our studies as compared to the temperatures reported by Ono et al [4]. Both the presence of tetragonal ZrO2 crystallites in the composite and the mild exothermicity of the metastable-cubic to tetragonal transformation of ZrO2 may reduce the crystallization temperature of amorphous SiO2.…”

Section: Resultscontrasting

confidence: 76%

“…The toughness of the ZrO2-SiO2 based ceramics is associated with the tetragonal-monoclinic transformation of ZrOz particles [1][2][3]. The stabilization of tetragonal phase up to very high temperatures appears possible by the control of microstructure using appropriate preparative and processing techniques [3,4]. In recent years, the sol-gel technique has been widely adopted to produce ultrafine, high-purity single and mutticomponent oxide glasses and ceramic composites [5].…”

Section: Introductionmentioning

confidence: 99%

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Crystallization studies of ZrO2−SiO2 composite gels

Nagarajan

Rao

1989

J Mater Sci

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Composite ZrO2-SiO2 powders were prepared using a gel route. Morphological and crystallographic features of ZrO 2 particles formed during the heat treatment, and the particle sizes of the composites have been investigated. The following polymorphic changes have been observed during the heat treatment: amorphous -+ metastable-cubic/tetragonal ZrO 2 --~ tetragonal ZrO2 ~ monoclinic ZrO2. SiO2 crystallizes above 1273 K. The martensitic transformation of Zr02 (t -, m) was observed in situ, when exposed to a high-energy electron beam. These results are important in the production of ZrO2-toughened ceramics of controlled microstructure.

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Section: Resultscontrasting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Crystallization studies of ZrO2−SiO2 composite gels

Nagarajan

Rao

1989

J Mater Sci

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“…These processes have been used at production levels of millions of tons per year in several industries. The gas-to-particle conversion route can also be used for the generation of multicomponent materials containing two or more elements in addition to oxygen and nitrogen (Buchanan et al, 1980;Kagawa et al, 1983a, b;Kagawa and Syono, 1985;Ono et al, 1985Ono et al, , 1987Pollinger and Messing, 1987;Akhtar et al, 1992b;Hung and Katz, 1992;Hung et al, 1992). However, it is often difficult to produce multicomponent materials with homogeneous chemical compositions because differences in chemical reaction rates of the reactants, and in the vapor pressures and nucleation and growth rates of the products may lead to nonuniform composition from particle to particle or within a single particle.…”

Section: Coagulation Imentioning

confidence: 99%

“…The rates of chemical reactions and thermodynamic properties, especially vapor pressures and surface energies of reaction products, determine the nucleation and growth behavior of the different products derived from the precursors. These properties are so different from precursor to precursor that the composition of particles formed in a multicomponent system is often nonuniform from particle to particle and within a single particle (Kagawa et al, 1983a7 b;Ono et al, 1985Ono et al, , 1987Pollinger and Messing, 1987;Hung andKatz, 1992, Hung et al, 1992). densation or gaseous reaction route.…”

Section: Novel Chemistries: Tailored Precursors For Multi-component Smentioning

confidence: 99%

Aerosol Processing of Materials

Gurav,

Kodas,

Pluym

et al. 1993

Aerosol Science and Technology

381

225

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Recent advances in aerosol generation of materials are reviewed. Gas-to-particle and spray processes (spray pyrolysis) for powder generation and various routes for film generation are discussed from the experimental and theoretical perspectives. The range of materials generated by these routes has increased in recent years to include fullerenes and ceramic superconductors. Many metals and various oxide and nonoxide ceramics have also been added to the list of materials generated by gas-phase routes. Established aerosol routes such as vapor condensation have found widespread applications for generation of nanophase materials. The formation of quantum dots via aerosol approaches has also been demonstrated. The theoretical understanding of gas-to-particle conversion routes has advanced to include the finite rate of particle fusion or sintering occurring after collisions of particles. The modeling of spray pyrolysis systems has provided insight into the control of particle morphology and reactor design. In this review, these recent developments in aerosol generation of powders and films via gas-phase and spray routes are discussed with an emphasis on the material chen~istries involved and the synthesis of nanophase materials.

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“…Much experimental work is being carried out to synthesize highly reactive, uniform submicrometre particle size distribution of pure and stabilized zirconia by using the following conventional preparation techniques such as attrition milling [3], reaction sintering [4], coprecipitation and decomposition of the sol-gel [5, 6], hydro-thermal processes [7], spray-ICP technique [8], and arc melting [9]. These techniques have some advantages and disadvantages.…”

mentioning

confidence: 99%

Synthesis of pure and calcia stabilized ZrO2 via liquid mix technique and their characterization

Singh

Date

1987

J Mater Sci Lett

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Partially and fully stabilized zirconia is one of the most important high tech (high performance) materials used in many diverse fields such as chemical gas sensors [1], high temperature refractories [2], etc. Much experimental work is being carried out to synthesize highly reactive, uniform submicrometre particle size distribution of pure and stabilized zirconia by using the following conventional preparation techniques such as attrition milling [3], reaction sintering [4], coprecipitation and decomposition of the sol-gel [5, 6], hydro-thermal processes [7], spray-ICP technique [8], and arc melting [9]. These techniques have some advantages and disadvantages. For example, attrition milling suffers from many drawbacks. Firstly, it lacks uniformity and homogeneity of the product. Secondly, this technique involves ball milling over an extended period of time which introduces lattice defects and strains in the materials. In the case of the coprecipitation technique, the control of the pH value is very critical. Other techniques are rather laborious and costly.We attempted to prepare pure as well as 5 mol % calcia-doped zirconia by a novel technique used successfully in our laboratory to synthesize other high tech reactive products [10][11][12][13]. This method is known as the liquid mix technique. Full details of this method have been discussed elsewhere [14] but a brief outline is given below. The required amount of calcium carbonate AR grade (Loba

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Ultrafine particles of the ZrO2-SiO2 system prepared by the spray-ICP technique

Cited by 44 publications

References 11 publications

Crystallization studies of ZrO2−SiO2 composite gels

Crystallization studies of ZrO2−SiO2 composite gels

Aerosol Processing of Materials

Synthesis of pure and calcia stabilized ZrO2 via liquid mix technique and their characterization

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