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佐藤 雄二*; 塚本 雅裕*; 菖蒲 敬久; 舟田 義則*; 山下 順広*; 原 崇裕*; 仙石 正則*; 左近 祐*; 大久保 友政*; 吉田 実*; et al.
Applied Surface Science, 480, p.861 - 867, 2019/06
被引用回数:24 パーセンタイル:81.84(Chemistry, Physical)A blue direct diode laser metal deposition system, which uses multiple lasers, was developed to realize a high-quality coating layer with a dense, fine structure and high purity. To clarify the formation mechanism of the pure copper layer, the formation process using a blue direct diode laser system was observed using in situ X-ray observations. The stainless steel 304 substrate melts, generating bubbles in the molten pool at a laser power density of 7.2 10 W/cm and a scanning speed of 3.0 mm/s. At a laser scanning speed of 9.0 mm/s, the bubbles disappear because only a slightly molten pool is formed on the surface of the substrate. The bubble amount and penetration depth depend on the laser input energy with a blue direct diode laser. By controlling the amount of input energy, a copper coating is produced minutely without a weld penetration.
山根 祐一; 荒木 祥平; 左近 敦士*
no journal, ,
反応度評価手法の比較のため、UTR-KINKIを用いて互いに異なる未臨界炉心を複数構成し、既存の手法及び新たに開発した手法を適用して反応度を評価した。数ドル程度の未臨界炉心に対して、準静的状態の出力挙動に基づいて評価した反応度はFeynman-法やsource jerk法と同程度の評価結果を示した。