Small onion-like BN leads to ultrafine-twinned cubic BN

Nanotwinned cubic boron nitride (nt-cBN) with remarkable hardness, toughness, and stability has attracted widespread attention due to its distinct scientific and industrial importance. The key for nt-cBN synthesis is to adopt an onion-like BN (oBN) nano-precursor and induce phase transition under hi...

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Veröffentlicht in:Science China materials 2019-08, Vol.62 (8), p.1169-1176
Hauptverfasser: Luo, Kun, Zhang, Yang, Yu, Dongli, Li, Baozhong, Hu, Wentao, Liu, Yong, Gao, Yufei, Wen, Bin, Nie, Anmin, Zhao, Zhisheng, Xu, Bo, Zhou, Xiang-Feng, Tian, Yongjun, He, Julong
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container_end_page 1176
container_issue 8
container_start_page 1169
container_title Science China materials
container_volume 62
creator Luo, Kun
Zhang, Yang
Yu, Dongli
Li, Baozhong
Hu, Wentao
Liu, Yong
Gao, Yufei
Wen, Bin
Nie, Anmin
Zhao, Zhisheng
Xu, Bo
Zhou, Xiang-Feng
Tian, Yongjun
He, Julong
description Nanotwinned cubic boron nitride (nt-cBN) with remarkable hardness, toughness, and stability has attracted widespread attention due to its distinct scientific and industrial importance. The key for nt-cBN synthesis is to adopt an onion-like BN (oBN) nano-precursor and induce phase transition under high pressure. Here, we found that the size change of oBN used greatly affected the mechanical performance of products. With the precursor size decreasing from ~320 to 90 nm, the Vickers hardness of nanostructured products improved from 61 to 108 GPa, due to the fact that large oBN nanoparticles possessed more flattened, orderly and graphite-like shell layers, in sharp contrast to the highly wrinkled and imperfect layers in small-diameter nanoparticles, thus resulting in the apparent reduction of ultrafine-twin substructure in the synthetic products. This study reveals that only small oBN precursor could produce complete ultrafine nt-cBN with outstanding performance. A practical route was proposed to further improve the performance of this important material.
doi_str_mv 10.1007/s40843-019-9409-1
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China Mater</addtitle><description>Nanotwinned cubic boron nitride (nt-cBN) with remarkable hardness, toughness, and stability has attracted widespread attention due to its distinct scientific and industrial importance. The key for nt-cBN synthesis is to adopt an onion-like BN (oBN) nano-precursor and induce phase transition under high pressure. Here, we found that the size change of oBN used greatly affected the mechanical performance of products. With the precursor size decreasing from ~320 to 90 nm, the Vickers hardness of nanostructured products improved from 61 to 108 GPa, due to the fact that large oBN nanoparticles possessed more flattened, orderly and graphite-like shell layers, in sharp contrast to the highly wrinkled and imperfect layers in small-diameter nanoparticles, thus resulting in the apparent reduction of ultrafine-twin substructure in the synthetic products. 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subjects Chemistry and Materials Science
Chemistry/Food Science
Cubic boron nitride
Diamond pyramid hardness
Materials Science
Mechanical properties
Nanoparticles
Onions
Performance enhancement
Phase transitions
Precursors
Substructures
Ultrafines
title Small onion-like BN leads to ultrafine-twinned cubic BN
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