Laser-based surface functionalisation: advances in durability and 3D processing

García Girón, Antonio (2020). Laser-based surface functionalisation: advances in durability and 3D processing. University of Birmingham. Ph.D.

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Abstract

Surface functionalization is gaining interests for industry and research due to the new attractive properties that can be “imprinted” on metal components, e.g. bacteria repellence or hydrophobicity among others. Considering the available alternative technologies to achieve such functional responses, direct laser writing is gaining a popularity due to its cost-effectiveness, selectivity and relatively short processing time. It allows surface properties to be modified or tuned by patterning and texturing at micron or submicron scales. However, laser surface functionalization has some limitations, too, such as the durability of the produced topographies and hence of their functionality, and also capabilities to apply it on free-form surfaces. In this context, the focus of the research presented in this thesis is on addressing these open issues. In particular, a combination of plasma surface alloying and laser patterning is proposed in order to increase hardness of produced functional surfaces, and thus to increase their wear resistance and durability. It was found that alloyed surfaces could retain their hardness after laser functionalization, and their wear resistance was increased. Furthermore, the impact of wear direction and wear cycles on functional response and topography dimensions was studied. Also, a method to study the effects of the process disturbances in patterning 3D surfaces is proposed, especially on resulting topographies and their functional responses. Correlations between process disturbances, areal surface parameters, resulting topography dimensions and functional response were found. All together, the research advances the knowledge in laser surface patterning and addresses key constraints for the broader use of this technology by industry.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):