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Abstract
AbstractFor engineering applications, hardness must be complimented with high toughness for applications where high contact loads are there. A good combination of hardness, toughness and low coefficient of friction can be achieved, by suitable tailoring of microstructures of coating in hard nanocomposite coatings. Tribologocal applications require hard coatings with tailored functionalities for different applications; hard nanocomposite coatings are potential materials for such applications. Ti and amorphous carbon based systems have shown more promising material. The present review discusses the nanocomposite hard coatings, mechanism of enhancement of toughness, multilayer hard nanocomposite coatings. Here, mainly Ti and Si based nanocomposite has been discussed as carbon based reviews are available in plenty in literature and well documented. Ti-B-N, Ti-Si-B-C, Ti-Si-B-C-N, Si-C-N, Ti-Al-N, Ti-Al-Si-N, Al-Si-N, Ti-Cr-Al-N, Zr-Si-N and some other similar system nanocomposite hard coatings are important where the gradual and intelligent additions of different elements in hard single component phase provides the combination of hardness, toughness and low coefficient of friction. Some of these systems are discussed. In the end, the future directions of research, Technology„ which are required to achieve tough nanocomposite hard coatings for actual applications are also highlighted.
Highlights
For engineering applications, hardness must be complimented with high toughness for applications where high contact loads are there
Ti-B-N, Ti-Si-B-C, Ti-Si-B-C-N, silicon carbonitride (Si-C-N), Ti-AlN, Ti-Al-Si-N, Al-Si-N, Ti-Cr-Al-N, Zr-Si-N and some other similar system nanocomposite hard coatings are important where the gradual and intelligent additions of different elements in hard single component phase provides the combination of hardness, toughness and low coefficient of friction
Hardness enhancement apart from toughness has been the primary goal of material scientist all over the world working in the area of nanocomposite hard coatings
Summary
Particles or controlled nanostructure in the composite can introduce new physical properties and can change significantly the properties of the original matrix, which may not be possible in single conventional microstructure or material [1,2,3,4]. It can result into very effective change in thermal, optical, elec-. The high density of boundaries between nanometer size grains embedded in the polycrystalline or amorphous matrix results in an increased mechanical resistance. Super hard nanocomposite coatings have nano-sized sized grains embedded in an amorphous matrix, which influence the hardness of the material. To apply multilayers to threedimensional components and maintaining the right period of layers is very difficult and leads to failures
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