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Boron carbide ceramic and preparation method and application thereof

A technology of boron carbide ceramics and boron carbide powder, which is used in offensive equipment, protective equipment, and the structure of armor plates, etc., can solve the decline in the hardness and bending strength of ceramics, weaken the ability of boron carbide bulletproof ceramics to strike multiple times, and is difficult to achieve. Problems such as uniform dispersion and uniform distribution

Active Publication Date: 2021-05-07
SUZHOU FIRST ELEMENT NANO TECH
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  • Abstract
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Problems solved by technology

However, in application practice, it is difficult for VGCF or carbon nanotubes to form a perfect uniform dispersion and uniform distribution in the ceramic matrix
Unevenly dispersed VGCF or carbon nanotubes will cause the local hardness and bending strength of the ceramic to decrease, thereby seriously weakening the ability of boron carbide bulletproof ceramics to resist multiple strikes by armor-piercing projectiles

Method used

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  • Boron carbide ceramic and preparation method and application thereof
  • Boron carbide ceramic and preparation method and application thereof
  • Boron carbide ceramic and preparation method and application thereof

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Embodiment 1

[0029] use Figure 1a and Figure 1b The device shown sinters boron carbide ceramics. The mixture of boron carbide powder and carbon nanotubes is placed in a sintering mold A, and the electrode pressure heads B at both ends are pressed tightly, and then sintered. The sintering container A is provided with graphite foil A1, boron nitride layer A2 and carbon fiber composite layer A3 sequentially from inside to outside in the radial direction.

[0030] The present embodiment relates to a process of flash firing-plasma sintering boron carbide ceramics, comprising the following steps:

[0031] Step 1, take 1.75 kg of boron carbide powder with a particle size of 0.5-25 μm, and 0.25 kg of carbon nanotubes (Suzhou First Element) with a length of 5-20 μm and a diameter of 10-200 nm, and mix them thoroughly to make a mixed material. The volume ratio of boron carbide powder to carbon nanotubes reaches 85:15;

[0032] Step 2, flash firing-plasma sintering mixed materials to obtain boron...

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Abstract

The invention discloses boron carbide ceramic and a preparation method and application thereof, and belongs to the technical field of weaponry. The preparation method of the boron carbide ceramic comprises the following steps: fully mixing boron carbide powder and carbon nanotubes in proportion, compacting and forming, then carrying out flash sintering-plasma sintering, and in the sintering process, generating nano-diamonds in situ from at least part of the carbon nanotubes, so as to obtain the boron carbide ceramic in which the carbon nanotubes and the nano-diamonds are uniformly distributed. The boron carbide ceramic prepared by the invention has the characteristics of high toughness, high hardness and high strength, can be used for bulletproof decks, and can resist multiple strikes of armor-piercing bullets and armor-piercing incendiary bombs.

Description

technical field [0001] The invention relates to a technology in the field of weapon equipment, in particular to a boron carbide ceramic and its preparation method and application. Background technique [0002] Boron carbide has excellent properties such as low density, high hardness, strength, and elastic modulus, and is more and more widely used in the field of bulletproof armor. However, its flexural strength and fracture toughness are low, and its brittleness is high, which limits the further application of boron carbide ceramics. [0003] Japanese Patent JP 5057327B2 (October 24, 2012) utilizes Vapor Growth Carbon Fiber (VGCF) and Al 2 o 3 As a sintering aid and toughening agent, it can significantly improve the physical properties of boron carbide ceramics (Vickers hardness, bending strength, fracture toughness). However, in application practice, it is difficult for VGCF or carbon nanotubes to form a perfect uniform dispersion and uniform distribution in the ceramic ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/563F41H5/04C04B35/64
CPCC04B35/563F41H5/0414F41H5/0428C04B35/64C04B2235/5288C04B2235/427C04B2235/666C04B2235/96C04B2235/77
Inventor 刘媛薛平董明
Owner SUZHOU FIRST ELEMENT NANO TECH
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