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An upgrade recycling from Mg alloy chips toward superconducting MgB2 via powder processing
Makoto Nanko,Daisuke Maruoka,Hitoshi Ozawa,Shigeharu Kamado,Hiroya Abe,Akira Kondo,Makio Naito 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature. A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature.
Kaneko, Kenji,Moon, Won-Jin,Inoke, Koji,Horita, Zenji,Ohara, Satoshi,Adschiri, Tadafumi,Abe, Hiroya,Naito, Makio Elsevier 2005 Materials science & engineering. properties, micro Vol.403 No.1
<P><B>Abstract</B></P><P>TiO<SUB>2</SUB>–Ag nanocomposite particles were prepared by spray pyrolysis of TiO<SUB>2</SUB> (7nm) dispersed AgNO<SUB>3</SUB> solution. The structures and morphologies of powders were carefully characterized by combination of transmission electron microscopy (TEM) and three-dimensional electron tomography (3D-ET). It was clearly demonstrated by 3D-ET that the TiO<SUB>2</SUB>–Ag nanocomposite particle was consisted of well-dispersed Ag nanoparticles within TiO<SUB>2</SUB> matrix. Furthermore, it was shown by high-resolution TEM that the spray pyrolysis was capable of fabricating Ag particles with a few nm in size.</P>
Kim, Ye-Hwan,Jung, Yeon-Gil,Yoon, Gwang Seob,Moon, Jinok,Watanabe, Akira,Naito, Makio,Paik, Ungyu American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.3
<P>Rectangular ceria particles were synthesized using the flash creation method. The influence of the morphology of ceria particles and the surfactant concentration on the removal rate was systematically investigated. These ceria slurries with polymeric surfactant molecules as the passivation agents of Si3N4 film, shows an exceptional non-Prestonian behaviors. The non-Prestonian behavior can be attributed to the increase in the contact area of the ceria particles with the SiO2 film, which is dominated by the morphology of the ceria particles. Force measurements using an atomic force microscope (AFM) at different concentrations of polymeric surfactant molecules was used to identify the interactions between the polymeric molecules and the oxide film and analyze the non-Prestonian behavior of ceria slurry having rectangular abrasives.</P>