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- Title
Preparation of boron-rich aluminum boride nanoparticles by RF thermal plasma.
- Authors
Choi, Sooseok; Matsuo, Jiro; Cheng, Yingying; Watanabe, Takayuki
- Abstract
Boron-rich compounds of AlB and AlB nanoparticles were synthesized by a radiofrequency thermal plasma. Aluminum and boron raw powders were evaporated in virtue of high enthalpy of the thermal plasma in upstream region, followed by the formation of aluminum boride nanoparticles in the tail region of plasma flame with rapid quenching. A high production rate of aluminum boride was confirmed by the X-ray diffraction measurement in the case of high input power, high boron content in raw material and helium inner gas. Polyhedral nanoparticles of 20.8 nm in mean size were observed by a transmission electron microscope. In the raw powder mixture of aluminum, titanium, and boron, titanium-boride nanoparticles were synthesized preferentially, because the Gibbs free energy for the boridation of titanium is lower than that of aluminum. Since the nucleation temperature of boron is higher than that of aluminum, the condensation of metal monomers onto boron nuclei results in the formation of boron-rich aluminum boride nanoparticles.
- Subjects
ALUMINUM bromide; BORON; METAL nanoparticles; METAL powders; THERMAL plasmas; RADIOFREQUENCY spectroscopy; ENTHALPY
- Publication
Journal of Nanoparticle Research, 2013, Vol 15, Issue 8, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-013-1820-1