High-speed laser-assisted surface modification

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)

Abstract

This chapter aims at providing a comprehensive review on the production by pulsed laser deposition of nano-composite films and coatings. A general introduction to the laser ultra-speed deposition techniques, including its main features and advantages and a description of the parameters that have direct impact on the quality and properties of nano-structural surface modification was made. The basic modern state of art about a phase transition of first order on examples of nucleation and growth nano-particles is presented. A kinetic equation for the distribution function of particle numbers of new phase by sizes under high-speed cooling from melt was received. A kinetic equation was decided exactly for broadly-realized in-practice lamellar (dendrite) nucleation for cases of laser coating, cladding, or (amorphous) vitrifying from melt. There were determined average crystal sizes, as well as a relative fraction of the volume solid phases. General equations, describing nano-particles distribution by sizes, their average radius, density, morphology, and content of new phases are analyzed. Influence of chemical state (catalytic properties) and deformations on the kinetic of phase transformation are discussed. Within the framework of considered kinetic approach, it is possible to describe different regimes of laser-assisted surface modification. From the material structure point of view, it is desirable to control both the morphology of nano-particles (size and shape) and their distribution within surface. From the process point of view, the control of laser energy input, the velocity of temperature changing of the species arriving to the substrate is essential to achieve further control on the surface morphology.

Original languageEnglish
Title of host publicationHigh Performance Coatings for Automotive and Aerospace Industries
PublisherNova Science Publishers, Inc.
Pages111-128
Number of pages18
ISBN (Print)9781608765799
Publication statusPublished - 2010
Externally publishedYes

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