Flame aerosol synthesis of phase-pure monoclinic Y2O3 particles via particle size control

Guo, Bing; Mukundan, Mallika; Yim, Hoon

doi:10.1016/j.powtec.2008.11.003

Cited by 10 publications

(8 citation statements)

References 11 publications

(22 reference statements)

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“…Metastable ␤-Y 2 O 3 has been observed in high-pressure or upon rapid solidification of molten submicron particles, e.g. by gas-flame 27,28 or inductively coupled plasma processing. 29 ␤-Y 2 O 3 has also been found as a constituent phase in air In order to assess the high-temperature microstructural evolution of APS Y 2 O 3 , specimens were annealed at 1200, 1300, and 1400 • C for 1 h, respectively (Fig.…”

Section: Methodsmentioning

confidence: 99%

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Mechnich

Braue

2013

Journal of the European Ceramic Society

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Al 2 O 3 /Al 2 O 3 ceramic matrix composites (CMC) are candidate materials for hot-gas leading components of gas turbines. Since Al 2 O 3 /Al 2 O 3 CMC are prone to hot-corrosion in combustion environments, the development of environmental barrier coatings (EBC) is mandatory. Owing to its favorable chemical stability and thermal properties, Y 2 O 3 is considered a candidate EBC material for Al 2 O 3 /Al 2 O 3 CMC. Up to 1 mm thick Y 2 O 3 coatings were deposited by means of air plasma spraying (APS) on Al 2 O 3 /Al 2 O 3 CMC with a reaction-bonded Al 2 O 3 bond-coat (RBAO). APS Y 2 O 3 coatings exhibit a good adherence in the as-deposited state as well as upon isothermal annealing up to 1400 • C. Moreover, furnace cyclic testing performed at 1200 • C revealed an excellent durability. This is explained by the formation of a continuous, approximately 1 m thick reaction zone at the APS Y 2 O 3 /RBAO interface. The reaction zone between Y 2 O 3 and Al 2 O 3 comprises three layers of thermodynamically stable yttrium-aluminates exhibiting strong bonding, respectively.

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Section: Methodsmentioning

confidence: 99%

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Mechnich

Braue

2013

Journal of the European Ceramic Society

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“…The FASP apparatus used in this study was similar to that used in previous studies (Guo and Luo 2008;Guo et al 2009a). A schematic illustration of the process is shown in Figure 1.…”

Section: Synthesis Conditionsmentioning

confidence: 99%

“…The gas temperature at the burner exit (base of flame) is similar to 600 K, which reaches over 2200 K within 20 mm above the burner exit (Guo and Kennedy 2004;Guo and Luo 2008). With a typical precursor droplet diameter of approximately 4 µm in diameter (Guo et al 2009a), the solvent evaporation may complete in less than a millisecond after the droplet enters the flame, during which time the droplet would travel less than a millimeter (See Appendix). As the solvent evaporates, the iron nitrate starts to nucleate and precipitate on the surface of the silica colloidal nanoparticles (Wang et al 2007).…”

Section: Correlation Of Flame Type and Particle Structurementioning

confidence: 99%

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Guo¹,

Yim²,

Khasanov³

et al. 2010

Aerosol Science and Technology

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In this study, iron silicon oxide particles were generated in a onestep flame assisted spray pyrolysis (FASP) process using H 2 /air or H 2 /O 2 diffusion flames. A colloidal precursor solution was used, which contained dissolved iron nitrate and stably suspended silica nanoparticles. H 2 /air flames resulted in magnetic Fe x O y /silica core-shell particles. There was a correlation between particle size and particle structure; particles larger than 500 nm had the coreshell structure, but smaller particles had non-core-shell structures. H 2 /O 2 flames only resulted in nanoparticles that had non-coreshell structures. The core-shell particles had a iron oxide core that was hermetically enclosed in a uniform silica shell with a typical thickness of approximately 100 nm; they were superparamagnetic with a room-temperature saturation magnetization greater than 24 emu/g. Temperature history of the particles may be used to explain the correlation between flame type and particle structure. The correlation between particle size and structure may be due to size-dependent thermodynamic stability of the structures, or kinetics of heat and mass transfer. The results from this study suggest that micrometer sized iron oxide silica core-shell magnetic particles could be generated from a one-step flame aerosol process, but Fe x O y /silica nanoparticles (<100 nm) with the coreshell structure cannot be generated in a one-step flame aerosol process.

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“…Usually, the flame is associated with the emission of light by the overheated gases, even that certain types of flames do not present visible light emission (Gaydon 1953). Usually, the flame is associated with the emission of light by the overheated gases, even that certain types of flames do not present visible light emission (Gaydon 1953).…”

Section: Flame Configuration and Burnersmentioning

confidence: 99%

“…The most famous example of a premixed flame was first described in 1855 by Bunsen, in a device that was obviously named Bunsen burner (Gaydon 1953). In this specific type of burner, the premixed gases are guided through the tube of the burner in a rate superior than the combustion rate of the mixture.…”

Section: Flame Configuration and Burnersmentioning

confidence: 99%

Flame Spray Technology

Bergmann

Trommer

2015

Topics in Mining, Metallurgy and Materials Engineering

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Flame aerosol synthesis of phase-pure monoclinic Y2O3 particles via particle size control

Cited by 10 publications

References 11 publications

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Flame Spray Technology

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Flame aerosol synthesis of phase-pure monoclinic Y2O3 particles via particle size control

Cited by 10 publications

References 11 publications

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Air plasma-sprayed Y2O3 coatings for Al2O3/Al2O3 ceramic matrix composites

Formation of Magnetic FexOy/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Flame Spray Technology

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Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process