- In-situ Synthesis of Cu-TiB2 Nanocomposite by MA/SPS
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Young-Soon Kwon, Ji-Soon Kim, Hwan-Tae Kim, Jin-Soo Moon, Dudina D.V, Lomovsky O.I.
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J Korean Powder Metall Inst. 2003;10(6):443-447.
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DOI: https://doi.org/10.4150/KPMI.2003.10.6.443
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 Abstract
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- Nano-sized TiB_2 was in situ synthesized in copper matrix through self-propagating high temperature synthesis (SHS) with high-energy ball milled Ti-B-Cu elemental mixtures as powder precursors. The size of TiB_2 particles in the product of SHS reaction decreases with time of preliminary mechanical treatment ranging from 1 in untreated mixture to 0.1 in mixtures milled for 3 min. Subsequent mechanical treatment of the product of SHS reaction allowed the TiB_2 particles to be reduced down to 30-50 nm. Microstructural change of TiB_2-Cu nanocomposite during spark plasma sintering (SPS) was also investigated. Under simultaneous action of pressure, temperature and electric current, titanium diboride nanoparticles distributed in copper matrix move, agglomerate and form a interpenetrating phase composite with a fine-grained skeleton.
- Characteristics of Nano-dispersed Powder by Electric Explosion of Conductors
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Young-Soon Kwon, Ji-Soon Kim, Jin-Soo Moon, Hwan-Tae Kim, Alexander-P Ilyin, Chang-Kyu Rhee, Geun-Hie Rim
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J Korean Powder Metall Inst. 2003;10(6):430-435.
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DOI: https://doi.org/10.4150/KPMI.2003.10.6.430
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Abstract
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- The phenomenon of electrical explosion of conductors is considered in the context of the changes in the energy and structural states of the metal at the stages of energy delivery and relaxation of the primary products of EEC. It is shown that these changes are related to the forced interaction of an intense energy flux with matter and to the subsequent spontaneous relaxation processes. The characteristics of nano-sized metal powders are also discussed. The preferential gas media during EEC is Ar+H_2. An increase in e/e_s (in the range of values studied) leads to a reduction in the metal content. For reactive powders obtained with high metal content, it is necessary to separate the SFAP fractions, which settled on the negative electrode of the electric filter.
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