Fabrication of Nanostructure Composites in Functionally Graded Coatings with Supersonic Free-Jet PVD

Atsushi Yumoto; Takahisa Yamamoto; Fujio Hiroki; Ichiro Shiota; Naotake Niwa

doi:10.4028/www.scientific.net/MSF.492-493.341

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HomeMaterials Science ForumMaterials Science Forum Vols. 492-493Fabrication of Nanostructure Composites in...

Fabrication of Nanostructure Composites in Functionally Graded Coatings with Supersonic Free-Jet PVD

Abstract:

Graded Al/AlTi and Al/Al-Si coatings are prepared by depositing 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. The high velocity of nanoparticles is produced by the supersonic gas flow of inert gas. A smooth, compact and defect-free microstructure is formed both at the interface between substrates and coating films and inside the coating films. The microstructures of Al/AlTi and Al/Al-Si coating films have very fine grain size. Mixing Ti and Al nanoparticles by depositing them onto a substrate produces in-situ syntheses of g-TiAl and a2-Ti3Al intermetallic compounds on the substrate. It is confirmed with nano-indentation hardness tester that graded coatings have graded hardness corresponding to the gradation of composition.

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Materials Science Forum (Volumes 492-493)

Pages:

341-346

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.492-493.341

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Online since:

August 2005

Authors:

Atsushi Yumoto, Takahisa Yamamoto, Fujio Hiroki, Ichiro Shiota, Naotake Niwa

Keywords:

Aluminium Silicon Alloy, Nanoindentation Hardness Test, Nanoparticle, Supersonic Gas Flow, Titanium Aluminide

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