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RISS 인기검색어
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- 저자 : Takasaki Akito (검색결과 3 건)
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Ti-based Quasicrystal Layers Produced by Plasma Thermal Spraying
Takasaki Akito,Uematsu Susumu,Kelton K.F. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
[ ] powders were thermally sprayed onto mild steel substrates in air and under a reduced pressure of argon. Several oxides were formed after thermally-spraying the mechanically-alloyed powders in air. After spraying in a reduced pressure of argon, the coating layers obtained from the gently mixed powders consisted of the elemental metals, but an amorphous phase primarily appeared in the thermally-sprayed mechanically-alloyed powders, which transformed into the icosahedral quasicrystal phase and a minor crystal phase after annealing at 828 K. The Vickers hardness and the contact angle with pure water for the quasicrystal layers were about 7 GPa and respectively.
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Oxygen storage properties of hexagonal HoMnO<sub>3+δ</sub>
Ś,wierczek, Konrad,Klimkowicz, Alicja,Nishihara, Kengo,Kobayashi, Shuntaro,Takasaki, Akito,Alanizy, Maleeha,Kolesnik, Stanislaw,Dabrowski, Bogdan,Seong, Seungho,Kang, Jeongsoo The Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.29
<▼1><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air.</P></▼1><▼2><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air. The oxygen storage properties during structural transformation between stoichiometric Hex0 and oxygen-loaded Hex1 phases, transition temperatures and kinetics of the oxygen incorporation and release are reported for materials prepared by the solid-state synthesis and high-impact mechanical milling. Long-term annealing experiments have shown that the Hex0 (<I>δ</I> = 0) → Hex1 (<I>δ</I> ≈ 0.28) phase transition is limited by the surface reaction and nucleation of the new phase for HoMnO3+δ 15MM. The temperatures of Hex0 ↔ Hex1 transitions have been established at 290 °C and 250 °C upon heating and cooling, respectively, at a rate of 0.1° min<SUP>−1</SUP>, also indicating that the temperature hysteresis of the transition could possibly be as small as 10 °C in the equilibrium. Ball-milling of HoMnO3+δ has only a small effect on improving the speed of the reduction/oxidation processes in oxygen, but importantly, allowed for considerable oxygen incorporation in air at a temperature range of 220–255 °C after prolonged heating. The Mn 2p XAS results of the Mn valence in oxygen loaded samples support the oxygen content determined by the TG method. The magnetic susceptibility data of the effective Mn valence gave inconclusive results due to dominating magnetism of the Ho<SUP>3+</SUP> ions. Comparison of HoMnO3+δ with previously studied DyMnO3+δ indicates that a tiny increase in the ionic size of lanthanide has a huge effect on the redox properties of hexagonal manganites and that practical properties could be significantly improved by synthesizing the larger average size (Y,Ln)MnO3+δ manganites.</P></▼2>
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Elhadji Babacar Ly,Marieme Josephine Lette,Abdou Karim Diallo,Adama Gassama,Akito Takasaki,Diene Ndiaye 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
This study estimates the potential using of typha australis (t. australis) as reinforcing element in compositematerials based on plant fibres as way of enhanced for this invasive plant. Composite materials based on t. australis, bambooand rice husk fibres were prepared with phenolic resin and their properties compared in order to evaluate this invasive plant inrelation to the commonly used fibres in composite materials. Scanning Electronic Microscopy shows similarity in themorphologic structure of t. australis and bamboo fibres. The failure mode is typically the same for all composite materialswhen fibres or system undergo the same treatment. The 3-point bending tests exhibit mechanical characteristics in the samerange for different composites materials, for example the Young modulus for t. australis, bamboo and rice husk compositeswithout any modification are estimated at 1.92, 2.04 and 2.00 GPa respectively.
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