Material process analysis by space-selective pulsed heating and its application

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289266
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Hokkaido University
• Principal Investigator: Koshizaki Naoto 北海道大学, 工学(系)研究科(研究院), 教授 (40344197)
• Co-Investigator(Kenkyū-buntansha): 石川 善恵 国立研究開発法人産業技術総合研究所, ナノ材料研究部門, 主任研究員 (20509129)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ナノ材料 / パルス加熱 / 局所加熱 / 球状粒子 / 表面処理

Outline of Final Research Achievements

We investigate the mechanism in crystalline submicrometer spherical particle formation by pulsed laser melting in liquid, in which pulsed laser is irradiated onto raw nanoparticles dispersed in liquid. From the experimental results regarding the pulse width dependence on the laser fluence threshold for spherical particle formation, we conclude that vapor phase layer formed by the rapid temperature increase due to laser light absorption acts as a barrier for thermal conductance, and that this further induces more rapid temperature increase to form molten droplets above the melting point and subsequent quenching to form spherical particles.

Free Research Field

ナノ材料科学