Superhard nanocomposite coatings - recent developments

Deepthi, B and Barshilia, Harish C and Rajam, KS (2007) Superhard nanocomposite coatings - recent developments. Technical Report. NAL.

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Abstract

The role of coatings as a surface modification technique has grown significantly for applications in automobile, aerospace, electronic, biomedical, cutting tool industries etc. since they can impart specific properties such as hardness, toughness, wear resistance, etc. to a surface. Transition metal nitride coatings have been widely used as protective hard coatings to increase the lifetime of cutting and forming tools. The use of hard coatings has spread well beyond tools; they are now being used for many tribological applications and also for decorative purposes. Among the significant developments in the area of hard coatings has been the synthesis of nanostructured coatings like nanoscale multilayers and nanocomposites. Highly sophisticated surface related properties like mechanical, optical, magnetic, electronic and tribological properties can be obtained using nanostructured coatings. Nanocomposite coatings are the emerging class of superhard materials and apart from high hardness they also exhibit high oxidation resistance, toughness, corrosion and wear resistance and even retain their high hardness at elevated temperatures. This report deals with the importance of superhard nanocomposite coatings and the recent developments in this area. The various strengthening mechanisms responsible for the high hardness of nanocomposite coatings have been discussed in detail. The deposition processes used for the preparation of nanocomposite coatings are also discussed. A summary of the experimental results obtained is presented in the later part of the report. Finally, we present the potential applications of the superhard nanocomposite coatings.

Item Type: Proj.Doc/Technical Report (Technical Report)
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
Depositing User: Mr N Selvakumar
Date Deposited: 11 Aug 2011 15:56
Last Modified: 11 Aug 2011 15:56
URI: http://nal-ir.nal.res.in/id/eprint/9853

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