Repari technique of aluminum foams using spot heating of brazing precursor

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K05163
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Gunma University
• Principal Investigator: Suzuki Ryosuke 群馬大学, 大学院理工学府, 准教授 (10612400)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ポーラスアルミニウム / 発泡 / 補修 / プリカーサ / アルミニウム合金

Outline of Final Research Achievements

A rectangular pure aluminum foam was prepared as the specimen. A hole was drilled at the center of the specimen to simulate a defect. A cylindrical aluminum alloy precursor was produced to use for a repairing filler. The filler foams and fills the hole by heating to high temperature. The filler was put into the hole in the specimen and the end face of filler was heated with an infrared image furnace and a TIG welding machine for repairing. The foaming repair could be carried out using a local heating source if the filler could be sufficiently foamed. It was also found that if there was metal with a large heat capacity around the defect, the filler did not foam and foaming repair was significantly difficult.

Free Research Field

材料力学

Academic Significance and Societal Importance of the Research Achievements

局所的に破壊したポーラスアルミニウム製大型構造部材を交換せずに継続的に利用するために，局所的破壊箇所を補修する必要がある．局所的破壊箇所を補修する技術として発泡補修が提案されているが，ポーラスアルミニウム製大型構造部材全体を高温に加熱する必要があるため，消費電力が大きくなり，補修コストが高くなる．本研究では，より安価に補修するために，フィラーを局所的に加熱することにより，発泡補修が可能か調べた．浅い欠陥であれば，発泡補修することで，欠陥がある場合に比べ部材強度を上昇させることが可能なことが明らかになった．これにより，これまでより安価にポーラスアルミニウム製大型構造部材の補修が可能になった．