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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.
Self-healing and mechanical properties of reinforced nickel-dispersed alumina hybrid nanocomposites
Hai Vu Pham,Makoto Nanko 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.5
Dense specimens of 5 vol%Ni/Al2O3 nanocomposites with fine grain size of Al2O3 and nano-Ni particles were fabricated by the pulsed current sintering technique. Vickers hardness, fracture toughness and bending strength of the nanocomposites were investigated at room temperature. Self-healing performance was evaluated at temperatures ranging 1100 ~ 1300 o C for 1 ~ 24 h. Bending tests were conducted on samples before and after heat-treatment in order to clarify the self-healing performance. As a result, fabricated sample achieved 995 MPa in bending strength and 6.1 MPam1/2 in fracture toughness. Introduced cracks on sample surface completely disappeared after heat-treatment at 1100 o C for 24 h. However, only 80% of cracks disappeared after heat-treatment at 1200 o C for 1 h in air. Bending strength of samples that were introduced cracks recovered up to the level as high as that of sintered samples after heat-treatment at 1200 o C for 6 h in air.