Growth model of binary alloy nanopowders for thermal plasma synthesis
- Department of Mechanical Systems and Design, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-Aoba, Aoba-ku, Sendai 980-8579 (Japan)
- Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259-G1-22 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)
A new model is developed for numerical analysis of the entire growth process of binary alloy nanopowders in thermal plasma synthesis. The model can express any nanopowder profile in the particle size-composition distribution (PSCD). Moreover, its numerical solution algorithm is arithmetic and straightforward so that the model is easy to use. By virtue of these features, the model effectively simulates the collective and simultaneous combined process of binary homogeneous nucleation, binary heterogeneous cocondensation, and coagulation among nanoparticles. The effect of the freezing point depression due to nanoscale particle diameters is also considered in the model. In this study, the metal-silicon systems are particularly chosen as representative binary systems involving cocondensation processes. In consequence, the numerical calculation with the present model reveals the growth mechanisms of the Mo-Si and Ti-Si nanopowders by exhibiting their PSCD evolutions. The difference of the materials' saturation pressures strongly affects the growth behaviors and mature states of the binary alloy nanopowder.
- OSTI ID:
- 21476419
- Journal Information:
- Journal of Applied Physics, Vol. 108, Issue 4; Other Information: DOI: 10.1063/1.3464228; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
BINARY ALLOY SYSTEMS
CRYSTAL GROWTH
FABRICATION
INTERMETALLIC COMPOUNDS
MOLYBDENUM
NANOSTRUCTURES
NUCLEATION
NUMERICAL ANALYSIS
PARTICLE SIZE
PARTICLES
PLASMA
POWDERS
SILICON
SYNTHESIS
TITANIUM
ALLOY SYSTEMS
ALLOYS
ELEMENTS
MATHEMATICS
METALS
REFRACTORY METALS
SEMIMETALS
SIZE
TRANSITION ELEMENTS