CUED Publications database

Laser micromachining of TiN coatings with variable pulse durations and shapes in ns regime

Demir, AG and Pangovski, K and O'Neill, W and Previtali, B (2014) Laser micromachining of TiN coatings with variable pulse durations and shapes in ns regime. Surface and Coatings Technology, 258. pp. 240-248. ISSN 0257-8972

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Abstract

© 2014 Elsevier B.V. The micro-structuring of thin surface coatings has become increasingly popular following the discovery of improved performance, especially in terms of the resulting tribological properties. The direct writing of microstructures via laser ablation offers flexibility, extending the applicability of micro-structuring to various materials and machined geometries. However, the laser ablation of coatings requires better comprehension to provide sufficient machining quality with improved productivity to render such processes more viable for industrial applications. This paper presents the processing conditions for the ablation of approximately 4-μm-thick coatings of TiN in the ns pulse regime, which is generally characterised by higher productivity with low machining quality. A range of pulse durations between 12. ns and 200. ns was employed. The effect of pulse duration on ablation threshold fluence and irradiance was investigated. The pulse shape was decomposed into peak and tail regions to investigate their respective effects on the ablation process. The opportune regulation of pulse properties allowed for the maintenance of high productivity and high-quality laser micromachining under delicate processing conditions, in the case of ceramic TiN surface coatings with limited thickness.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Div E > Manufacturing Systems
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:57
Last Modified: 17 Aug 2017 01:24
DOI: