A comparison study of the agglomeration mechanism of nano- and micrometer aluminum particles

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.11.010· OSTI ID:22066179

Deng, J; Luo, Z M ^[1]

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1. Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi'an University of Science and Technology, Xi'an, 710054 China (China)

The agglomeration mechanism of micro- and nanosize aluminum particles with a primary mean particle diameter of 4.5 {mu}m and 75 nm, respectively, was comparatively investigated under an incident shock wave. The morphology, particle size, and agglomeration process of micro- and nanometer alumina particles were comprehensibly compared by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. Images of X-ray diffraction reveal that a varied of phases of alumina ({gamma}-, {delta}-, {epsilon}-, and {alpha}-Al{sub 2}O{sub 3}) were simultaneously found in the nanosize alumina products, which may give some detail information of the wide variety of reacting temperature of aluminum nanoparticles, while Al{sub 4}C{sub 3} was detected in micrometer alumina products, which also gives some dynamic information of aluminum to alumina, i.e., aluminas have actually reacted with the free active carbon atoms to produce their intermediates. The microstructure of aluminas induced by the incident shock waves was detected and analyzed by using transmission electron microscopy combined with X-ray photoelectron spectroscopy spectrum. These results are an additive evidence to support that the initial stage sintering of the alumina nanosize powders is dominated by grain boundary diffusion, while the volume diffusion is the main character for the initial stage sintering of the micrometer alumina powders.

• OSTI ID: 22066179
• Journal Information: Materials Characterization, Vol. 61, Issue 2; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
AGGLOMERATION
ALUMINIUM
ALUMINIUM CARBIDES
ALUMINIUM OXIDES
COMPARATIVE EVALUATIONS
DIFFUSION
GRAIN BOUNDARIES
MORPHOLOGY
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
POWDERS
SCANNING ELECTRON MICROSCOPY
SHOCK WAVES
SINTERING
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY