| Project/Area Number |
03555154
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | University of Tokyo |
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Principal Investigator |
KAGAWA Yutaka Institute of Industrial Science, The University of Tokyo, Associate Professor, 生産技術研究所, 助教授 (50152591)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Masaomi Nikkei Gikenn Co.Ltd.,, セラミックス研究室, 主任研究員
WATANABE Shuichiro Nikkei Giken Co.Ltd.,, 取締役電子室長, 研究室長
CHOU Chang Institute of Industrial Science, The University of Tokyo, Resarch Assistant, 生産技術研究所, 助手 (90092270)
MAEDA Masafumi Institute of Industrial Science, The University of Tokyo, Associate Professor, 生産技術研究所, 助教授 (70143386)
大蔵 明光 文部省宇宙科学研究所, 教授 (90013151)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1991: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Directed Oxidation / Aluminum Melt / Al_2O_3 / Al alloy Composites / In situ Processing / Microstructure of Composite / Growth Mechanism / Optimum Processing Variables / Directed Nitridation / 溶融アルミニウム合金 / in situプロセス / 生成モデル / シミュレーション / 熱的特性 / 力学的特性 / Al_2O_3-Al合金複合材料 / 金属 / セラミックスin situ複合材料 / 指向性酸化法 / アルミニウム合金(Al-Si-Mg) / 生成速度 / 金属複合材料 / モデル化 / in situ(その場)観察 |
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| Research Abstract |
Directed melt oxidation is an attractive process for fabrication of dense, near net shaped metal/ceramic composite materials. An experimental and theoretical study was conducted to study the growth mechanism of the Al_2O_3/Al alloy composites. The oxidation of Al-Mg-Si alloys was carried out at temperatures ranging from 900 to 1700K under dry air gar atmosphere. The optimum processing variables were obtained experimentally and microstructure of the obtained composite was compared with the processing condition. The typical composite structure was three-dimensionally interconnected Al_2O_3 phase (70 vol%) and residual aluminum alloy phase (30 vol%). The growth process was divided into three characteristic stages. Stage I corresponded to formation of porous spinel layr above the liquid aluminum alloy. After stage I, bulk Al_2O_3/Al alloy composite formed and the growth rate showed the maximum value. During stage III, the oxidation rate constantly decreased. The decreased oxidation rates were due to increased melt viscosity, higher diffusion distances from aluminum and depletion of aluminum alloy reservoir. The modeling and analysis have been done on the growth process and the result reasonably agrees with the experimental result. The application of this process to Al_2O_3/Al alloy matrix reinforced with SiC fiber or SiC particle was also carried out.
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