Establishment of Advanced Cold Spray Method Based on Elucidation of Solid Phase Bonding Interface Phenomena

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15056
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Tohoku University
• Principal Investigator: Saito Hiroki 東北大学, 工学研究科, 助教 (20869648)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 固相接合 / コールドスプレー法 / 酸化皮膜

Outline of Final Research Achievements

It is known that a native oxide film on the surface of materials can have a significant effect on the material bonding in the cold spray process, where coatings and deposits are formed only by high-velocity impact of solid-phase metal particles. However, the effect of the oxide film on bonding is not fully understood, as it can inhibit or promote bonding depending on the combination of materials. In this study, the thickness of the oxide film on the substrate surface was varied in the nanometer range, and the effect of the oxide film on the bonding of solid-phase impact particles was evaluated. The results showed that the number of particles that achieved solid-phase bonding increased in proportion to the percentage of oxide film removed, and that the removal of the oxide film on the metal surface significantly facilitated bonding.

Free Research Field

材料加工学

Academic Significance and Societal Importance of the Research Achievements

コールドスプレー（CS）法は鋳物や溶接のように金属を液相化する工程を必要とせず，多様な材料部材を高速に接合・造形するポテンシャルをもっている．本研究から金属材料の接合では，酸化皮膜を事前に除去することが有効であり，特に除去直後のCSが重要であることを明らかにした．この成果より，酸化皮膜は固相接合の可否に大きく影響し，酸化皮膜の状態を変えることで材料の接合を促進できることがわかった．本研究で開発した技術は，限りある資源の中で適切な材料を組み合わせるマルチマテリアル化の実現に貢献する技術と期待される．