Reactive plasma synthesis of nanocrystalline ceramic oxides

Sreekumar, K.; Vijay, M.; Thiyagarajan, T.K.; Krishnan, K.; Ananthapadmanabhan, P.V.

doi:10.1088/1742-6596/208/1/012123

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…If the reactive gases, such as, oxygen and nitrogen, are used as one of the main constituents to form a plasma flame, however, chemical reactions between the radical reactive species and the heated precursors can be conducive to synthesis of nano-sized materials. Many kinds of oxides, carbides and nitrides have been synthesized in this way [10,[71][72][73][74]. For example, nano-sized Al2O3 or TiO2 particles can be easily obtained by in-flight treatment of Al metal or titanium hydrides in oxidative thermal plasma [71,72].…”

Section: Thermal Plasma Synthesis Of Nano-sized Non-metal Powdersmentioning

confidence: 99%

“…Many kinds of oxides, carbides and nitrides have been synthesized in this way [10,[71][72][73][74]. For example, nano-sized Al2O3 or TiO2 particles can be easily obtained by in-flight treatment of Al metal or titanium hydrides in oxidative thermal plasma [71,72]. Since the oxidation reaction of metal is normally exothermic, these processes can be more energy effective compared with size reduction of micron-sized Al2O3 or TiO2 precursors into nano-sized particles.…”

Section: Thermal Plasma Synthesis Of Nano-sized Non-metal Powdersmentioning

confidence: 99%

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Thermal Plasma Synthesis of Nano-Sized Powders

Seo¹,

Hong²

2012

Nuclear Engineering and Technology

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Section: Thermal Plasma Synthesis Of Nano-sized Non-metal Powdersmentioning

confidence: 99%

Section: Thermal Plasma Synthesis Of Nano-sized Non-metal Powdersmentioning

confidence: 99%

Thermal Plasma Synthesis of Nano-Sized Powders

Seo¹,

Hong²

2012

Nuclear Engineering and Technology

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“…Thermal plasma processing [20], [21] is a versatile and attractive route to synthesize nanocrystalline ceramic materials. Vaporization in the plasma jet followed by recombination and condensation [20] offers a clean one-step process for bulk synthesis of a variety of materials.…”

Section: Introductionmentioning

confidence: 99%

“…Vaporization in the plasma jet followed by recombination and condensation [20] offers a clean one-step process for bulk synthesis of a variety of materials. Thermal plasma technology is being increasingly applied to a variety of material processing applications.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nanosized Yttria in a DC Plasma Reactor and Its Characterization

Chaturvedi

Ananthapadmanabhan

Chakravarthy

et al. 2015

IEEE Trans. Plasma Sci.

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Nanocrystalline yttrium oxide has been synthesized by thermal plasma route using a dc plasma reactor. The phase composition of the product was analyzed by X-ray diffraction (XRD). The XRD patterns showed cubic and monoclinic phases in the synthesized product. The powder was characterized by scanning electron microscopy and transmission electron microscopy (TEM). The TEM images confirmed the nanometer size of the particles in the range of 3-47 nm. Surface area analysis [Brunauer-Emmett-Teller (BET)] and particle size analysis by laser scattering have also been used to characterize the particle size of plasma-synthesized yttria nanoparticles. The TEM images, BET, and particle size by laser scattering also reveal that particles are agglomerated. The results showed that the particle size decreased with an increase in plasma power and the fraction of nanosized powder increased with power. The amount of metastable monoclinic phase was found to increase as the fraction of particles below 20 nm increased.Index Terms-Brunauer-Emmett-Teller (BET), nanoparticles, particle size analyzer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), yttria. Manuscript

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Numerical Modelling of Ar-N2 Plasma Jet Impinging on a Flat Substrate

et al. 2010

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Substrate heating in the plasma spray process is one of the important parameters, which affects the microstructure of coatings and bonding between coating and substrate. In this study, a three-dimensional numerical model is developed to study the thermal exchange between the plasma jet and the substrate. The plasma jet temperature and velocity distributions and thermal flux to the substrate surface are predicted. The effects of arc current, gas flow rate, and stand-off distance on the temperature and velocity fields of the impinging plasma jet and thermal flux to the substrate are clarified. Results indicate that the three-dimensional effect has a very weak influence on the substrate heating. The air entrainment is compared for different cases. The present model is validated by comparing the present results with previous predictions and measurements. The temperature distributions in the substrate for different stand-off distances are predicted.

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Reactive plasma synthesis of nanocrystalline ceramic oxides

Cited by 4 publications

References 5 publications

Thermal Plasma Synthesis of Nano-Sized Powders

Thermal Plasma Synthesis of Nano-Sized Powders

Formation of Nanosized Yttria in a DC Plasma Reactor and Its Characterization

Numerical Modelling of Ar-N2 Plasma Jet Impinging on a Flat Substrate

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