Hardness of Polycrystalline Wurtzite Boron Nitride (wBN) Compacts

Wurtzite boron nitride (wBN), due to its superior properties and many potential practical and scientific applications, such as ideal machining/cutting/milling ferrous and carbide materials, especially as an ideal dielectric substrate material for optical, electronic, and 2-D graphene-based devices,...

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Bibliographic Details
Published in:Scientific reports 2019-07, Vol.9 (1), p.10215-6, Article 10215
Main Authors: Liu, Yinjuan, Zhan, Guodong (David), Wang, Qiang, He, Duanwei, Zhang, Jiawei, Liang, Akun, Moellendick, Timothy E., Zhao, Le, Li, Xiao
Format: Article
Language:English
Subjects:
639/301
639/301/119
Boron
Hardness
High pressure
High temperature
Humanities and Social Sciences
Mechanical properties
multidisciplinary
Powder
Science
Science (multidisciplinary)
Silicones
Thermal stability
Ultrahigh temperature
X-ray diffraction
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Summary:Wurtzite boron nitride (wBN), due to its superior properties and many potential practical and scientific applications, such as ideal machining/cutting/milling ferrous and carbide materials, especially as an ideal dielectric substrate material for optical, electronic, and 2-D graphene-based devices, has recently attracted much attention from both academic and industrial fields. Despite decades of research, there is an ongoing debate about if the single-phase wBN is harder than diamond because of the difficulty to make pure wBN material. Here we report the successful synthesis of pure single-phase polycrystalline wurtzite-type boron nitride (wBN) bulk material by using wBN powder as a starting material with a well-controlled process under ultra-high pressure and high temperature. The cubic boron nitride (cBN) was also successfully prepared for the first time from wBN starting material for comparison and verification. The X-ray diffraction (XRD) and TEM clearly confirmed that a pure single-phase wBN compact was produced. The microstructure and mechanical properties including Vickers hardness, fracture toughness, and thermal stability for the pure single-phase wBN was first evaluated.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-46709-4