Elucidation of reactive wetting by super spread wetting on surface fine crevice structure

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05182
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26060:Metals production and resources production-related
• Research Institution: Osaka University
• Principal Investigator: Nakamoto Masashi 大阪大学, 低温センター, 助教 (80467539)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 濡れ速度 / 特異拡張濡れ / 溶解 / 化合物形成 / 金属 / 合金

Outline of Final Research Achievements

We aimed to construct a new method to quantitatively evaluate reactive wetting accompanied by dissolution and compound formation using super spread wetting on the surface microstructure of metals formed by laser irradiation discovered by the applicants and elucidate the mechanism of super spread wetting. The super spread wetting of the molten metal on the surface fine crevice structure formed on the Cu plate was quantitatively evaluated from the wetting speed. It was found that the wetting speed of Sn and In is large, and that of Pb and Bi is small. This can be explained by contact angles and compound formation. Based on the infiltration rate formula derived in this study, the rate of super spread wetting of metals that do not form compounds was expressed, and the wetting of metals that form compounds was relatively evaluated.

Free Research Field

高温融体物性

Academic Significance and Societal Importance of the Research Achievements

古くは紀元前のはんだから近年では積層造形に至るまで、液体金属の固体金属への濡れは様々な製品の生産に巧みに利用され産業の根幹をなす現象の一つであるが、液体と固体が反応しながら濡れる反応濡れのメカニズムは明確になっていない。本研究の成果は、反応濡れを定量的に評価する手法の構築であり、反応濡れのメカニズム解明への足掛かりになることが期待される。