Electro-spark deposition

Another problem limiting the application of nanociystalline materials is prep>aration of nanocrystalline alloys. Currently, the bulk metallic nanomaterials can only be prepared at the laboratory scale, usually by compacting prepared nanocrystalline powders. However, consolidation of the nanopowders into bulk materials needs high temperature and pressure which may considerably coarsen the structure. Because of this difficulty, surface nanocoating has been considered a potential industry application. Nanocrystalline costing are often prepared by chemical vapour deposition (CVD), physical vapour deposition (PVD), electrochemical deposition, electro-spark deposition, and laser and electron beam surface treatment. 

Li Z., Gao W, Kwok P. and He Y. (2000), Electro-spark deposition coatings for high temperature oxidation resistance . High Temp. Mater. Proc., 19,443-58. 

Liz.,Gao W. and He Y. (2001a), Protection ofaTijAl-Nb alloy by electro-spark deposition tMaHsi g ScriptaMater, 45,1099-105. 

Li Z., Gao W., Yoshihara M. and He Y. (2003), Improving oxidation resistance of TijAl and TiAl intermetalhc compounds with electro-spark deposit coatings . Mater. Sci. Ewg.H, 347,243-52. 

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