成果報告書詳細
管理番号20110000000820
タイトル*平成22年度中間年報 希少金属代替材料開発プロジェクト 超軽量高性能モータ等向けイットリウム系複合材料の開発(2)
公開日2011/8/5
報告書年度2010 - 2010
委託先名国立大学法人東北大学金属材料研究所
プロジェクト番号P08023
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
(1) 要約
本研究開発項目では、イットリウム系複合材料における希少金属の利用率向上を目的とし、レーザCVD 法のイットリウム系複合材料合成プロセスへの適用可能性を実証しつつ、収率向上を中心に置いた最適条件の検討を行うことにより40%以上の高収率を見通す技術開発を目的とした。まず、これまで、主に固体原料を用いてきたレーザCVD 法において、液体原料を用いるレーザCVD 装置の開発を行った。無脈動液体搬送ポンプを用いて液体原料を加熱容器へ搬送して気化させ、反応炉内へ搬送する手法を開発した。開発したレーザCVD 装置を用いて、イットリウム系複合材料成膜への適用可能性および収率向上を目的とした最適成膜条件の検討を行った。IBAD 線材基板上に合成した膜は、ほぼc 軸配向したYBCO膜であった。最大収率は45.7%を達成し、目標とした40%以上の高収率でのイットリウム系複合材料作製法の技術開
発を見通した。
英文要約Title: The Rare Metal Substitute Materials Development Project. 9-(2) Development of New Permanent Magnets Substituting for Nd-Fe-B Magnets and Development of Yttrium-based Compound. Development of Yttrium-based Composite Material for Ultra-light and High-performance Motors (FY2009-FY2011) FY2010 Annual Report (Tohoku University)
[Theme 2 ”Improvement of material (Rare metals) yields in fabrication process of Y-based composite materials.” Sub-theme (1) Improvement of material yields by laser CVD method] Yttrium-based composite material, such as YBa2Cu3O7-x (YBCO), is a promising material as a superconductive layer in a coated conductor for ultra-light and high-performance motors and their films have mainly been prepared by metal-organic chemical vapor deposition (MOCVD). Nowadays, a long-length production process of YBCO film on Hastelloy C276(TM) tape has been studied for practical application. Especially, the improvement of material yields in rare metal resources is needed to take steps toward a sustainable society. Laser chemical vapor deposition (LCVD) can realize YBCO coating at a high deposition rate and high efficiency. In the present term, we developed a feeding system of liquid source precursors for laser CVD to improve the yield constant of yttrium and prepared YBCO films on Hasterlloy C276 tape. Liquid precursors were transferred from reservoir to evaporator by a nonpulsatile pump and carried into the CVD camber with Ar gas. A precursor vapor and O2 gas was separately introduced into the CVD chamber through a double-tube nozzle. The total pressure of the CVD chamber was fixed at 600 Pa. Multilayer-coated Hastelloy C276(TM) tape (IBAD tape) was used as a substrate. An Nd:YAG laser in a continuous wave mode was collimated by lenses to irradiate the whole substrate and introduced into the CVD chamber through a quartz window. YBCO films were prepared on IBAD tape by LCVD. A c-axis-oriented YBCO film was obtained at laser power of 101 W (deposition temperature of 823 K). A small amount of a-axis-oriented grains and c-axis-oriented YBa2Cu4O8 phase were also identified. At yttrium concentration of 0.06 mol l~1 and Y:Ba:Cu ratio of 1:1.9:2.7, the yttrium yield constant of YBCO films prepared on IBAD tape (10 × 10 mm2) increased from 9.0 to 18.8% with increasing deposition temperatures from 790 to 969 K. In case of IBAD tape (20 × 25 mm2), the yttrium yield constant increased from 25.5 to 42.1% with increasing deposition temperatures from 859 to 916 K and reached 43.6% at 958 K. YBCO film prepared at deposition temperature of 922 K consisted of c-axis oriented YBCO phase and a small amount of secondary phase and showed the maximum yield constant of 45.7%. The results obtained in the present term indicate that LCVD method contributes to improve rare metals yields in fabrication process of yttrium-based composite materials.
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