Catalyst-free controllable batch preparation method of high-strength and high-toughness boron carbide nanowires

A technology of nanowires and boron carbide, applied in the field of preparation of boron carbide nanowires, can solve the problems of easy agglomeration of carbon nanotubes, difficult removal of multi-walled carbon nanotubes, low purity of nanowires, etc., and achieves easy operation and fewer defects. , The effect of the simple process

Pending Publication Date: 2022-07-22
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low purity of nanowires, easy agglomeration of carbon nanotubes, and difficult removal of redundant multi-walled carbon nanotubes during the preparation of existing boron carbide nanowires, so as to realize the controllable growth of boron carbide nanowires and mass production preparation, a catalyst-free high-strength and high-toughness boron carbide nanowire (B 4 C nw ) controlled batch preparation method

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  • Catalyst-free controllable batch preparation method of high-strength and high-toughness boron carbide nanowires

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specific Embodiment approach 1

[0023] Specific embodiment 1: The catalyst-free controllable batch preparation method of high-strength and high-toughness boron carbide nanowires of this embodiment is carried out according to the following steps:

[0024] 1. Ball milling and mixing of raw materials for boron carbide nanowire preparation

[0025] Weigh amorphous boron powder and multi-walled carbon nanotubes with a mass ratio of 4:1, add them into a ball milling jar, add an appropriate amount of ball milling balls, and perform ball milling and mixing with a certain ball milling process to obtain mixed powder;

[0026] The purity of the amorphous boron powder (B) is greater than 99%, and the purity of the multi-wall carbon nanotube (MWCNT) is greater than 99%;

[0027] The amorphous boron powder is amorphous boron; the activity of the amorphous boron powder is higher than that of the crystalline boron powder, which is favorable for diffusing with the multi-walled carbon nanotubes at a lower temperature. The im...

specific Embodiment approach 2

[0040] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the diameter distribution of the amorphous boron powder in step 1 is between 200 nm and 5 μm, and the average diameter is 1 to 2 μm.

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the outer diameter of the multi-walled carbon nanotubes in step 1 is 8-150 nm, the inner diameter is 4-30 nm, and the length is 5 nm. Between ~20μm; the average outer diameter is 20nm~100nm, the average inner diameter is 6nm~25nm, and the average length is 10μm.

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Abstract

The invention discloses a catalyst-free controllable batch preparation method of a high-strength and high-toughness boron carbide nanowire, and relates to a preparation method of a boron carbide nanowire. The invention aims to solve the problems that the purity of the nanowire is low, the nanowire is easy to agglomerate, redundant multi-walled carbon nanotubes are not easy to remove and the like when the boron carbide nanowire is prepared. Amorphous boron powder and multi-walled carbon nanotubes are used as raw materials, the multi-walled carbon nanotubes are uniformly distributed on the surface of the amorphous boron powder through sufficient mixing of ball milling, and boron atoms are diffused in the multi-walled carbon nanotubes through heating in an inert protective atmosphere to form the boron carbide nanowires through nucleation; and removing redundant amorphous boron powder by using concentrated nitric acid, and removing redundant carbon nanotubes by using an oxidizing atmosphere to finally obtain the boron carbide nanowire with high purity, good crystallinity and high mechanical strength. The method has the advantages of low cost, no participation of other catalysts, low required temperature, low impurity content of the product, and excellent mechanical properties; the process method is simple, easy to operate and suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of boron carbide nanowires. Background technique [0002] As one of the common ceramic substances, boron carbide has high hardness, second only to boron nitride and diamond. As a typical ceramic with high hardness and high strength, the strength of boron carbide can reach 2500GPa, and the elastic modulus can reach 460GPa. In addition, boron carbide with its low density (2.52g / cm 3 ), excellent thermal expansion performance (thermal expansion coefficient 5.73×10 -6 / ℃), high temperature conductivity, corrosion resistance and neutron shielding properties are often used in aerospace, nuclear engineering and semiconductor industries. In addition to the excellent properties of boron carbide, boron carbide nanowires have good toughness due to their anisotropy. Therefore, boron carbide nanowires are suitable for use in metal-based, ceramic-based, polymer and other composite materials to improve the strength an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991B82Y40/00
CPCC01B32/991B82Y40/00C01P2004/16C01P2006/21
Inventor 吴翌铭武高辉杨文澍周畅
Owner HARBIN INST OF TECH
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