2023 Fiscal Year Final Research Report

Direct bonding of CFRTP at temperatures under melting point by using a nobel highly efficient plasma and elucidation of the mechanism

Research Project

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Project/Area Number	19K05039
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 26030:Composite materials and interfaces-related
Research Institution	Kanazawa Institute of Technology
Principal Investigator	Endo Kazuhiro 金沢工業大学, 高信頼理工学研究センター, 教授 (50356606)
Co-Investigator(Kenkyū-buntansha)	和田倫明金沢工業大学, 革新複合材料研究開発センター, 研究員 (30839593) 金原勲金沢工業大学, 産学連携室, 教授 (50011101) 瀬戸雅宏金沢工業大学, 工学部, 教授 (90367459)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	CFRP / プラズマ / 直接接合 / 接合メカニズム / 社会実装
Outline of Final Research Achievements	The development of the joining technology is an urgent problem in order to use the CFRP with light and strong features as a substitute of the metals. We performed the joining of the CFRP at temperatures under melting point by using a novel highly efficient plasma. This approach generates on the surface of the resin functional groups with a long lifetime. Surface states before and after plasma treatments were observed by measurements of the contact angle of water and XPS. Using the functional groups generated under the plasma treatments we successfully demonstrated fabrication of a joint with extremely strong shear stress of 36 MPa. It results that we solved the problems of conventional joining methods of CFRP by using bolts, adhesives or thermal adhesion. Durability test of plasma irradiation effect was carried out for the penetration of our CFRP. Finally, through a thermodynamic approach, the mechanism of direct bonding by the plasma irradiation was elucidated.
Free Research Field	新材料の開発
Academic Significance and Societal Importance of the Research Achievements	新奇高性能プラズマにより、融点未満の温度で、融着せずにCFRPの直接接合に成功した。そのメカニズムの解明は、より強い接合を実現するために不可欠である。この研究が「不思議の解明」という、大学での学術研究に止まらず、新しい産業創出の目になることを目指す。その意味で、本研究の成果が、社会実装できるか、否かは極めて重要である。社会実装として、「安全で安心な」社会の実現を目指し、橋梁などのインフラを対象とした補修・補強、および排ガス規制が厳しくなる中、モビリティの軽量化に貢献できる補強材料の開発に取り組んだ。いずれも、プラズマによるCFRPの接合が要の技術になる。