Al/Al-Si Nano-Composite Graded Coating Prepared by Supersonic Free-Jet PVD
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- Yumoto Atsushi
- Department of Mechanical Systems Engineering, Faculty of Engineering, Kogakuin University
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- Yamamoto Takahisa
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo
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- Hiroki Fujio
- Department of Mechanical Systems Engineering, Faculty of Engineering, Kogakuin University
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- Shiota Ichiro
- Department of Materials Science and Technology, Faculty of Engineering, Kogakuin University
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- Niwa Naotake
- Department of Mechanical Systems Engineering, Faculty of Engineering, Kogakuin University
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Abstract
Increase of Si content increases wear resistant properties of hypereutectic Al-Si alloys. However, large primary Si phase is inevitable in Al-Si alloy when the alloy is produced by conventional casting processes, which deteriorate its machinability as well as its mechanical properties. The objective of this study is to produce graded Al/Al-Si nanocomposite coating onto an A1050 Al alloy substrate by mixing Al and Si nanoparticles with Supersonic Free-Jet PVD (SFJ-PVD). The SFJ-PVD has been developed as a new coating method in which a coating film is formed by depositing nanoparticles with very high velocity onto a substrate. This SFJ-PVD provides a high deposition rate and produces a mixture of different kinds of nanoparticles formed in different evaporation chambers on the substrate. The graded Al/Al-Si coating film is produced by depositing Al and Si nanoparticles formed in different evaporation chambers with the controlled evaporation rates of Al and Si respectively. A smooth, compact and defect-free microstructure is formed both at the interface between the substrate and the coating film and inside the coating film. The graded Al-Si coating film has very fine, varying from 10 to 20 nm in diameter, Si phases in Al matrix. It is confirmed with nano-indentation hardness tester that the graded Al/Al-Si coating film on A1050 substrate has graded hardness from 0.65 to 5.9 GPa corresponding to the gradual compositional change of Si up to Al-57.8 at%Si.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 45 (8), 2740-2743, 2004
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001204251909248
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- NII Article ID
- 130004452559
- 10013474798
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- NII Book ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD2cXosV2hurw%3D
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 7051802
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed