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

Pacella, Manuela; Fay, M. W.; Butler-Smith, Paul W.; Axinte, Dragos A.

Abstract

© 2015 Published by Elsevier B.V. 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. Prime novelty statement The paper presents for the first time an evaluation of laser ablated polycrystalline cubic boron nitride surfaces and substructures at nanometric resolution. A novel procedure for the focus ion beam preparation of circa 100 nm thick lamella using multi surface protection coatings and stabilising straps is presented, allowing and HRTEM imaging and EELS analyses of this fragile structure.

Citation

Pacella, M., Fay, M. W., Butler-Smith, P. W., & Axinte, D. A. (2015). The allotropic transformation of polycrystalline cubic boron nitride structures resulting from the thermal effects of pulsed laser ablation. Diamond and Related Materials, 59, 62-68. https://doi.org/10.1016/j.diamond.2015.09.009

• Journal Article Type: Article
• Acceptance Date: Sep 13, 2015
• Online Publication Date: Sep 25, 2015
• Publication Date: Oct 1, 2015
• Deposit Date: Aug 9, 2018
• Journal: Diamond and Related Materials
• Print ISSN: 0925-9635
• Electronic ISSN: 1879-0062
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 59
• Pages: 62-68
• DOI: https://doi.org/10.1016/j.diamond.2015.09.009
• Public URL: https://nottingham-repository.worktribe.com/output/1111355
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0925963515300406
• PMID: 00036488
• Additional Information: This article is maintained by: Elsevier; Article Title: The allotropic transformation of polycrystalline cubic boron nitride structures resulting from the thermal effects of pulsed laser ablation; Journal Title: Diamond and Related Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.diamond.2015.09.009; Content Type: article; Copyright: Copyright © 2015 Elsevier B.V. All rights reserved.