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Significant strengthening of copper-based composites using boron nitride nanotubes

International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1764-1778页

作者： Naiqi Chen Quan Li Youcao Ma Kunming Yang Jian Song Yue Liu Tongxiang Fan State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute of Materials China Academy of Engineering PhysicsMianyang 621900China

nanotubes, such as boron nitride nanotubes (BNNTs) and carbon nanotubes (CNTs), exhibit excellent mechanical properties. In this work, high-quality BNNTs were synthesized by ball milling and annealing. Subsequently, well-dispersed 3vol%BNNTs/Cu and 3vol%CNTs/Cu composites were successfully prepared using ball milling, spark plasma sintering, and followed by hot-rolling. Moreover, the mechanical properties and strengthening mechanisms of BNNTs/Cu and CNTs/Cu composites were compared and discussed in details. At 293 K,both BNNTs/Cu and CNTs/Cu composites exhibited similar ultimate tensile strength (UTS) of~404 MPa, which is approximately 170%higher than pure Cu. However, at 873 K, the UTS and yield strength of BNNTs/Cu are 27%and 29%higher than those of CNTs/Cu, *** difference can be attributed to the stronger inter-walls shear resistance, higher thermomechanical stability of BNNTs, and stronger bonding at the BNNTs/Cu interface as compared to the CNTs/Cu interface. These findings provide valuable insights into the potential of BNNTs as an excellent reinforcement for metal matrix composites, particularly at high temperature.

关键词： boron nitride nanotubes copper matrix composites excellent mechanical property strengthening mechanism

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A density functional theory study on parameters fitting of ultra long armchair(n,n) single walled boron nitride nanotubes

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Chinese Physics B 2012年第6期21卷 19-25页

作者：王艳丽张军平苏克和王欣刘艳孙旭 Key Laboratory of Space Applied Physics and Chemistry Ministry of Education of ChinaSchool of Natural and Applied SciencesNorthwestern Polytechnical University College of Chemistry and Life Science Weinan Normal University

Armchair （n, n） single walled boron nitride nanotubes with n = 2-17 are studied by the density functional theory at the B3LYP/3-21G（d） level combined with the periodic boundary conditions for simulating the ultra long model. The results show that the structure parameters and the formation energies bear a strong relationship to n. The fitted analytical equations are developed with correlation coefficients larger than 0.999. The energy gaps of （2, 2） and （3, 3） tubes are indirect gaps, and the larger tubes （n = 4-17） have direct energy gaps. Results show that the armchair boron nitride nanotubes （n = 2-17） are insulators with wide energy gaps of between 5.93 eV and 6.23 eV.

关键词： boron nitride nanotubes ultra long periodic boundary conditions formulas fitting

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Adsorption of Fe(CO)_4 on the Sidewall of boron nitride nanotubes:A Periodic DFT Study

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Chinese Journal of Structural Chemistry 2008年第8期27卷 1009-1012页

作者：陈勇李俊篯 Department of Chemistry Fuzhou UniversityFuzhou Fujian 350002 China

The adsorption of Fe（CO）4 on various types of boron nitride nanotubes （BNNTs） areinvestigated by employing density functional theory. Our results indicate that Fe（CO）4 prefers to adsorb on the top of nitrogen atom via Fe atom, and the electronic property analysis indicates that the adsorption of Fe（CO）4 can reduce the band-gap of BNNTs.

关键词： Fe(CO)4 boron nitride nanotubes adsorption DFT electronic properties

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Highly efficient synthesis of boron nitride nanotubes by catalytic chemical vapor deposition of boron/nickel containing precursors

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Journal of Materiomics 2022年第6期8卷 1199-1204页

作者： Heng Wang Haoran Yang Yongzhi Peng Yulin Zheng Dongying Huang Pu Hu Yawei Li Zhengyi Fu Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Key Laboratory of Green Chemical Engineering Process of Ministry of EducationWuhan Institute of TechnologyWuhan430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China

High-purity and high-yield boron nitride nanotubes with large aspect ratio were prepared by a facile two-step process,including the synthesis of boron/nickel containing precursors by precipitation reactions and subsequent thermally catalytic chemical vapor deposition *** influence of catalyst content and annealing temperature on the phase composition and microstructure of the products were *** results show that it is difficult to exert the catalytic effect of nickel-based catalyst at low temperatures(boron nitride nanotubes with a length of more than 50 mm and a diameter of 50 nm are *** content of catalyst in the precursor mainly affects the morphology of the boron nitride *** the content is too low,it is easy to form boron nitride particles;while high catalyst content can easily lead to catalyst aggregation and form a submicron one-dimensional boron nitride with unregular *** on microstructural evolutions,phase changes,and thermodynamic analysis,the vapor-liquid-solid(V-L-S)growth mechanism of the tip growth mode dominates the formation of boron nitride nanotubes has also been verified.

关键词： boron nitride nanotubes Highly efficient synthesis boron/nickel containing precursors Growth mechanism

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nanotubes in a Gradient Electric Field as Revealed by STM TEM Technique

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Nano Research 2008年第2期1卷 166-175页

作者： Dmitri Golberg Pedro M.F.J.Costa Masanori Mitome Yoshio Bando Nanoscale Materials Center Namiki 1-1TsukubaIbaraki 305-0044Japan International Center for Materials Nanoarchitectonics(MANA) National Institute for Materials ScienceNamiki 1-1TsukubaIbaraki 305-0044Japan Center for Research in Ceramics and Composite Materials University of Aveiro3810-193 AveiroPortugal

We have investigated the behavior of two nanotube systems,carbon and boron nitride,under controlled applied voltages in a high-resolution transmission electron microscope(TEM)equipped with a scanning tunneling microscope(STM)*** nanotubes(or thin bundles)were positioned between a piezo-movable gold electrode and a biased(up to±140 V)STM tip inside the pole-piece of the *** structures studied include double-and multi-walled carbon nanotubes(the latter having diverse morphologies due to the various synthetic procedures utilized),few-layered boron nitride nanotube bundles and multi-walled boron nitride nanotubes(with or without functionalized surfaces).The electrical breakdown,physical failure,and electrostatic interactions are documented for each system.

关键词： Carbon nanotubes boron nitride nanotubes transmission electron microscope scanning tunneling microscope

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