Development of a plasma bonding process by reaction control of plasma-liquid interface

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18619
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 14:Plasma science and related fields
• Research Institution: Meijo University
• Principal Investigator: Uchida Giichiro 名城大学, 理工学部, 教授 (90422435)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: プラズマジェット / 金属/樹脂接合 / プラズマ気液界面 / 活性酸素種 / シランカップリング溶液

Outline of Final Research Achievements

We have developed a plasma thermo-compression bonding method for thermally bonding various resins(PC, PA, PE, PS, PP) and metals(SUS304, steel plate) by irradiating their surfaces with a high-density high-frequency (60 MHz) plasma jet. As a result, higher bonding strength was obtained for all resins compared to conventional thermal bonding. The bonding strength was further enhanced by the plasma solution hybrid process in which a silane coupling solution was applied to the metal surface. Finally, resin/stainless steel bonding was 3 to 12 times stronger than conventional thermal bonding, and resin/steel sheet bonding was 2 to 4 times stronger than conventional thermal bonding. This study demonstrates that the plasma/solution hybrid joining method using the reaction between silane coupling solution and high-frequency plasma jet is effective for resin/metal joining.

Free Research Field

プラズマ応用

Academic Significance and Societal Importance of the Research Achievements

炭素繊維強化プラスチックの応用展開において、マトリックス材の樹脂と金属との接合が重要な技術となる。従来の金属/樹脂間の熱圧着は基本的に極性官能基を有する樹脂にのみ適用可能であった。本研究の社会的意義は、高周波プラズマジェットを熱源とする新た熱圧着法を開発することにより、広範囲の熱可塑性樹脂に熱接合の適用範囲を拡大し、さらに従来熱圧着法よりも高い接合強度を達成した点にある。また、本研究の学術的意義は、シランカップリング溶液と高周波プラズマジェットとの気液界面での化学反応を利用した新たなプラズマ溶液ハイブリッド接合法が樹脂/金属接合に有効性であることを実証した点にある。