Fabrication of Nanostructure Composites in Functionally Graded Coatings with Supersonic Free-Jet PVD
Fabrication of Nanostructure Composites in Functionally Graded Coatings with Supersonic Free-Jet PVD
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DOI：
10.4028/www.scientific.net/msf.492-493.341
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发表时间：
2005-04
期刊：
影响因子：
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通讯作者：
A. Yumoto;Takahisa Yamamoto;F. Hiroki;I. Shiota;N. Niwa
中科院分区：
文献类型：
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作者：
A. Yumoto;Takahisa Yamamoto;F. Hiroki;I. Shiota;N. Niwa
采用超音速自由射流PVD （SFJ-PVD）沉积纳米颗粒制备了Al/AlTi和Al/Al- si梯度涂层。SFJ-PVD是一种新的涂层方法，通过在衬底上以极高的速度沉积纳米颗粒形成涂层。纳米粒子的高速是由惰性气体的超声速气流产生的。在基材和涂层之间的界面以及涂层内部形成光滑、致密和无缺陷的微观结构。Al/AlTi和Al/Al- si涂层的显微组织具有非常细的晶粒尺寸。通过将Ti和Al纳米颗粒沉积在衬底上，可以在衬底上原位合成g-TiAl和a2-Ti3Al金属间化合物。用纳米压痕硬度计证实，分级涂层的硬度随成分的分级而分级。
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.