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Droplet-assisted laser micromachining of hard ceramics

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journal contribution
posted on 27.05.2016, 11:27 by Jose M. Lopez-Lopez, Alan Bakrania, Jeremy CouplandJeremy Coupland, Sundar Marimuthu
Hard ceramic materials like tungsten carbide (WC) are extensively used in high value manufacturing, and micromachining of these materials with sufficient quality is essential to exploit its full potential. A new micro-machining technique called droplet assisted laser micromachining (DALM) was proposed and demonstrated as an alternative to the existing nanosecond (ns) dry pulse laser ablation (PLA). DALM involves injecting liquid micro-droplets at specific frequency during the nanosecond laser micromachining to create impulse shock pressure inside the laser irradiation zone. The impulse shock pressure is generated due to the explosive vaporisation of the droplet, during its interaction with high temperature laser irradiation zone. In this paper, the DALM uses a nanosecond pulsed Nd:YAG laser to machine tungsten carbide substrate. The results suggest that the impulse shock pressure generated during the DALM process can transform the melt ejection mechanism of the ns laser micromachining process. The change in ejection mechanism results in a 75% increase in material removal rate and 71% reduction in the spatter redeposited compared to conventional dry ns laser micromachining.

Funding

The authors acknowledge the support offered by the UK Engineering and Physical Sciences Research Council (EPRSC) under thegrant EP/L01968X/1 and British Council under the grant DST-2014-15-037.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of the European Ceramic Society

Volume

36

Issue

11

Pages

2689 - 2694

Citation

LOPEZ-LOPEZ, J. ... et al., 2016. Droplet-assisted laser micromachining of hard ceramics. Journal of the European Ceramic Society, 36 (11), pp.2689-2694.

Publisher

Elsevier / © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2016

Notes

Open Access funded by Engineering and Physical Sciences Research Council Under a Creative Commons license http://creativecommons.org/licenses/ by/4.0/

ISSN

0955-2219

eISSN

1873-619X

Language

en