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A kind of boron carbide bulletproof material and preparation method thereof

A boron carbide and bulletproof technology, applied in the field of bulletproof materials, can solve problems such as harsh preparation conditions, achieve the effects of accelerating sintering rate, increasing driving force, and improving density

Active Publication Date: 2022-06-17
上海衡益特陶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing boron carbide bulletproof materials need to be prepared at higher temperatures or higher pressures, making the preparation conditions extremely harsh

Method used

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  • A kind of boron carbide bulletproof material and preparation method thereof
  • A kind of boron carbide bulletproof material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The present invention also provides a preparation method of boron carbide bulletproof material, comprising the following steps:

[0035] S1: will contain B 4 Powder of C, containing Si 3 N 4 powder, containing CeO 2 powder, containing Al 2 O 3 The powder and graphene-containing powder were mixed to prepare nanocomposite powder.

[0036] S1 includes the following specific steps:

[0037] a1. Weigh according to mass percentage: B 4 C powder 45.5 to 49.2%, Si 3 N 4Powder 30.0~33.3%, CeO 2 Powder 0.3~0.8%, Al 2 O 3 9.0-9.5% of the powder and 10.7-11.7% of the graphene powder are mixed by wet ball milling to obtain a mixed material. Wherein, the dispersion medium is absolute ethanol, the ball milling speed is 150-200r / min, and the ball-milling time is 10-20h.

[0038] a2. Dry, grind, sieve and granulate the mixture to obtain a powder mixture; wherein, the drying temperature is 70-100° C., and the mixture is passed through a 300-mesh sieve.

[0039] a3. The powd...

Embodiment 1-7

[0051] The process parameter conditions of the boron carbide bulletproof materials of Examples 1-7 are shown in Table 1:

[0052] Process parameter conditions of boron carbide bulletproof material in Table 1 Examples 1-7

[0053]

[0054]

[0055] Example performance test

[0056] The properties of the boron carbide bulletproof materials prepared in Examples 1-7 were tested, and the results are shown in Table 2.

[0057] Table 2 Performance test results of boron carbide bulletproof materials prepared in Examples 1-7

[0058] Example Vickers hardness (GPa) Fracture toughness (MPa.m 1 / 2 )

Embodiment 4

[0060] In Example 4, by adding cerium oxide, the porosity of the bulletproof material can be reduced and the density can be increased; by adding graphene, the toughness of the material can be improved due to the layered structure of graphene; by adding Al 2 O 3 The sintering temperature is reduced by nearly 400 °C.

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Abstract

The invention relates to the technical field of bulletproof materials, in particular to a boron carbide bulletproof material, comprising the following components: B 4 C. Si 3 N 4 , CeO 2 、Al 2 o 3 and graphene, the boron carbide bulletproof material is adopted containing B 4 Nanopowder of C, Si 3 N 4 Nano powder, CeO 2 Nano powder, Al 2 o 3 The nano-composite powder made of nano-powder and graphene nano-powder is fired; wherein, in the nano-composite powder, B 4 Nanopowder of C and Si 3 N 4 The mass ratio of nano powder is 1.4~1.6:1, CeO 2 The percentage of the nano-powder in the total mass of the nano-composite powder is 0.3-0.8%, and the Al 2 o 3 The percentage of the nanometer powder accounting for the total mass of the nano composite powder is 9.0-9.5%, and the percentage of the graphene nano powder accounting for the total mass of the nano composite powder is 10.7-11.7%. After compounding the above components in the present invention, the sintering conditions become milder, the required sintering temperature is 1380-1490°C, and the sintering pressure is 18-22MPa. At the same time, the prepared bulletproof material has high hardness and fracture toughness. and flexural strength.

Description

technical field [0001] The invention relates to the technical field of bulletproof materials, in particular to a boron carbide bulletproof material and a preparation method thereof. Background technique [0002] Because of its low density, high strength, high temperature stability and good chemical stability, boron carbide is used in wear-resistant materials, ceramic reinforced phases, especially in lightweight armor, reactor neutron absorbers, etc. In addition, compared with diamond and cubic boron nitride, boron carbide is easy to manufacture and low cost, so it is more widely used. It can replace expensive diamond in some places, and it is commonly used in grinding, grinding, drilling and other applications. [0003] However, it is very difficult to obtain a high-density sintered body due to its covalent bond structure. Even if pure boron carbide is sintered at a high temperature close to its melting point, material migration rarely occurs, the relative density of the si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/626C04B35/645
CPCC04B35/563C04B35/62615C04B35/62695C04B35/645C04B2235/3873C04B2235/3229C04B2235/3217C04B2235/425C04B2235/6581C04B2235/96
Inventor 黄俊王海岩周泳陆幸根
Owner 上海衡益特陶新材料有限公司