Structural and adhesional properties of thin MoO3 films prepared by laser coating

18th International Summer School on Vacuum, Electron and Ion Technologies

Mihalev, Mihail^1 ; Hardalov, Chavdar^2 ; Christov, Christo^2 ; Michailov, Michail^3 ; Ranguelov, Bogdan^3 ; Leiste, Harald^4

Faculty of Mechanical Engineering, Technical University of Sofia, 8 Kliment Ohridski Blvd., 1000 Sofia, Bulgaria^1

Department of Applied Physics, Technical University of Sofia, 8 Kliment Ohridski Blvd., 1000 Sofia, Bulgaria^2

Institute of Physical Chemistry, Bulgarian Academy of Sciences, Building 11, Akad. G. Bonchev Str., 1113 Sofia, Bulgaria^3

Insitute of Applied Materials-Applied Materials Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany^4

关键词: Amorphous interfaces;    Chemical bondings;    Micro indentation;    Scanning velocity;    Stainless steel substrates;    Surface structural analysis;    Technological applications;    Topological design;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012022/pdf
DOI  :  10.1088/1742-6596/514/1/012022

来源: IOP

【 摘 要 】

Laser marking plays an important role in numerous technological applications because of its flexibility, fastness and versatility. The present study deals with the structural and adhesional properties of thin MO3layers on stainless steel substrates prepared by a specific modification of the laser coating technology known as «laser bonding». This approach consists in the local laser sintering of an initially deposited proper powder material, which forms under laser irradiation a layer with a definite graphical and topological design. The coatings, prepared of only MoO3powder irradiated by a CO2laser beam, are well bonded to the substrate and exhibit diffusive light reflection. Through applying a variety of methods for surface structural analysis, as micro-indentation, XRD, micro-Raman and SEM, this study also provides detailed information about the coatings' chemical bonding and composition. Our results reveal a good adhesion to the steel due to the formation of an amorphous interface between the MoO3and the substrate. This amorphous interface arises from a «quenching» process of the molten MoO3acting both as an oxidant and flux. Depending on the laser beam's intensity, energy and scanning velocity, we also observed recrystallization in specific areas of the coatings. The present study contributes to the better understanding of the adhesion, wear-resistance and hardness of MoO3coatings obtained by laser bonding.