Nanocomposites and nanomaterials
Strengthened Nanocomposite surface layers
Stetsko A.E.1
1 Faculty of computer engineering printing, Ukrainian Academy of Printing. Pidgolosko Str., 19, Lviv-79020, Ukraine.
E-mail: andrew73@ukr.net

The resource of parts of machines is increased by different methods: they are made of durable wear-resistant materials; apply heat treatment; carry out laser treatment; apply high-energy influence on the surface, etc. Promising is the new methods of simultaneous or sequential use of several methods. They allow you to get new quantitative and qualitative indicators of the strengthened surface layers due to the benefits of these methods.
In the complex method [1-3] of strengthening chemical deposition and chemical-thermal treatment for parts made of iron-carbon alloys are used. The strengthened layers of a nanocomposite structure with a soft matrix of solid solution and solid inclusions are obtained. Depending on the methods used, the layers have a thickness of up to 300 μm. The soft matrix is basically a solid solution of saturated element in α-iron with a microhardness of approximately 1600 MPa. Solid inclusions are predominantly carbide and nitride grains of a saturated element (boron, chromium, titanium, carbon) with an integral microhardness of 20,000 to 30,000 MPa. The received composite structure of strengthened layers in 2-10 times increases the resource of the strengthened parts. The thickness of such layers allows multiple repairs.

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2.	Stetsko A.E. (2017) Effect of Chemical Vapor Deposition on the Morphology of the Nanocomposite Layer in the Complex Method. In: Fesenko O., Yatsenko L. (eds) Nanophysics, Nanomaterials, Interface Studies, and Applications. NANO 2016. Springer Proceedings in Physics, vol 195. Springer, Cham. – P. 611-622.
3.	Stetsko A. (2018) The Nanocomposite Diffusion Coating of Details Prepared of Boriding. In: Fesenko O., Yatsenko L. (eds) Nanochemistry, Biotechnology, Nanomaterials, and Their Applications. NANO 2017. Springer Proceedings in Physics, vol 214. Springer, Cham. – P. 345-356.