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- 저자 : Lee Jaechen (검색결과 2 건)
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Nanosize Particles of ZrVFe Alloy by Pulsed Laser Ablation in Ethanol
Kil, Daesup,Suh, Yongjae,Jang, Heedong,Lee, Jaechen,Song, Changbin,Kim, Wonbaek The Japan Institute of Metals 2005 Materials transactions Vol.46 No.11
<P>Nanosize powder of ZrVFe alloy has been prepared by a laser ablation method using a ZrVFe alloy as a target material. Ablation of the target alloy was carried out in a liquid container. The laser fluence, energy density at the target surface, was adjusted by manipulating the laser power and focus size to control the ablating conditions. The obtained colloidal dispersions of the nanoparticle were filtered and dried for characterization. The crystal structure of prepared nanoparticles maintained clear crystallinity and was the same as that of the original target alloy by comparison of the X-ray diffraction pattern. The particle sizes were distributed at around 100 nm depending on the used ablation conditions. The minimum average particle size of 71 nm was obtained at the laser fluence of 20.3 J/cm<SUP>2</SUP>, while the average size was not proportional to the laser fluence. The morphologies and oxidation state of the particle have been discussed for possible use of the ZrVFe powder as a getter material.</P>
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Laser Ablation법에 의한 ZrVFe 합금 나노분말 제조
길대섭,서용재,장희동,이재천,송창빈,김원백,Kil Daesup,Suh Yongjae,Jang Heedong,Lee Jaechen,Song Changbin,Kim Wonbaek 한국재료학회 2005 한국재료학회지 Vol.15 No.4
Nano-sized ZrVFe alloy powders were prepared by the ablation of powder compact in alcobol using a Nd-YAG pulsed Laser. The $Zr_{57}V_{35.}8Fe_{7.2}$ alloy commercially designated as ST707 has long been known as the ideal solution for various vacuum applications. The target for the ablation was sintered pellets of $Zr_{57}V_{35.}8Fe_{7.2}$ alloy powder. The alloy was prepared by arc melting and Hydride-DeHydride method. The ablated powders were mostly circular having fairly large size distribution smaller than 200 nm in all cases. The X-ray diffraction study revealed that the ablated alloy retained the crystal structure of the target alloy. Nevertheless, Fe and V contents in the ablated powder were lower than those in the target alloy. This was believed to result from the high vapour pressures of Fe and V compared to that of Zr. The size of the powders ablated at high energy fluence tends to decrease due at least partly to the breakdown of previously made ones.
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