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The allotropic transformation of polycrystalline cubic boron nitride structures resulting from the thermal effects of pulsed laser ablation

journal contribution
posted on 26.02.2019 by Manuela Pacella, P.W. Butler-Smith, D.A. Axinte, M.W. Fay
Cubic boron nitride, being only second to diamond for its hardness and possessing superior thermal stability is suitable for a wide range of applications. In particular, the versatility of this material and its polycrystalline cubic boron nitride composite form can be extended by micro processing enabling its use in advanced manufacturing applications. By employing a pulsed laser ablation technique for the micro texturing of this material, this paper presents for the first time the thermal response of polycrystalline cubic boron nitride incorporating a ceramic binder to the laser ablation process. Combined FIB/TEM/EELS/EDX techniques have been used to characterise a cubic boron nitride based material and its Titanium Carbide binder at nanometric resolutions after the surface has been ablated via an Nd Yag laser. Allotropic transformations of the cubic boron nitride into amorphous boron nitride immediately below the ablated surface and into hexagonal boron nitride down to depths exceeding 300 nm have been identified in a site exposed to high thermal excitation while the boundaries between boron nitride and the primary binder constituents remained definitive. Importantly, the structural integrity of the studied PCBN remained intact below the regions of phase transformations.

Funding

The authors would like to acknowledge Element Six Limited (UK) for its financial support for this research.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Diamond and Related Materials

Volume

59

Pages

62 - 68

Citation

PACELLA, M. ... et al, 2015. The allotropic transformation of polycrystalline cubic boron nitride structures resulting from the thermal effects of pulsed laser ablation. Diamond and Related Materials, 59, pp.62-68.

Publisher

© Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This paper is closed access.

ISSN

0925-9635

Language

en

Exports