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Boron carbide ceramic as well as preparation method and application thereof

A boron carbide ceramic and boron carbide powder technology, used in offensive equipment, protective equipment, personnel protection equipment, etc., can solve the problems of weak interface integration, insufficient fracture toughness of ceramics, lack of effective bonding, etc., and achieve multi-shot resistance. Good results

Active Publication Date: 2022-01-07
北京安达维尔航空设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the room temperature flexural strength of the obtained boron carbide ceramics has reached 391.4MPa, and the fracture toughness has also been improved; but the improvement of the fracture toughness of the ceramics is still not obvious enough, because there is a lack of effective bonding between the carbon fiber and the boron carbide matrix.
Patent CN103073318A uses pitch and other organic carbon sources to impregnate carbon fiber reinforcements, and then co-sinters with boron carbide micropowder to obtain layered distribution of boron carbide composite materials, but the interface integration ability of a single organic carbon source is weak, and it is impossible to make carbon fibers and carbonization Strong bond between boron matrix

Method used

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

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preparation example Construction

[0029] The present invention also provides a method for preparing boron carbide ceramics described in the above technical solution, comprising the following steps:

[0030] The continuous silicon carbide fiber fabric is immersed in the titanium precursor solution for the first surface modification, and the continuous silicon carbide fiber fabric with the titanium precursor adsorbed on the surface is obtained;

[0031] The continuous silicon carbide fiber fabric with the titanium precursor adsorbed on the surface is immersed in a phenolic resin solution, and the second surface modification is performed to obtain a continuous silicon carbide fiber fabric with double surface modification;

[0032] Laying the double-surface modified continuous silicon carbide fiber fabric and boron carbide powder in alternate layers to obtain a preform;

[0033] Extruding, debinding and sintering the blank in sequence to obtain the boron carbide ceramics.

[0034] In the present invention, unless o...

Embodiment 1

[0070]Get commercially available titanium sol (model: XZ-TI35, Hefei Xiangzheng Chemical Technology Co., Ltd.) to be dissolved in dehydrated alcohol, stir well, form the solution of concentration 5wt%; Then surface density 110g / m 2 Place the continuous silicon carbide fiber plain weave fabric in it, turn on the ultrasonic wave (power 30kHz) in the submerged state, take it out after 10 minutes, let it air at room temperature for 1 hour, and then keep it in a drying oven at 60°C for 1 hour, take it out and cool it to room temperature for later use, and obtain surface adsorption Continuous silicon carbide fiber fabrics with titanium precursors.

[0071] Dissolve commercially available phenolic resin (model: PF9502, Jinan Shengquan Group Co., Ltd.) in absolute ethanol, stir evenly to form a solution with a concentration of 10 wt%, and then put the continuous silicon carbide fiber fabric with the titanium precursor adsorbed on its surface Put it in it, turn on the ultrasonic wave (...

Embodiment 2

[0077] Take commercially available tetrabutyl titanate (chemically pure, Sinopharm Chemical Reagent Co., Ltd.) and dissolve it in absolute ethanol, stir well to form a solution with a concentration of 6wt%, and then make the surface density 110g / m 2 Place the continuous silicon carbide fiber plain weave fabric in it, turn on the ultrasonic wave (power 30kHz) in the submerged state, take it out after 10 minutes, let it air at room temperature for 1 hour, and then keep it in a drying oven at 60°C for 1 hour, take it out and cool it to room temperature for later use, and obtain surface adsorption Continuous silicon carbide fiber fabrics with titanium precursors.

[0078] Dissolve commercially available phenolic resin (model: PF9502, Jinan Shengquan Group Co., Ltd.) in absolute ethanol, stir evenly to form a solution with a concentration of 10 wt%, and then put the continuous silicon carbide fiber fabric with the titanium precursor adsorbed on its surface Put it in it, turn on the...

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Abstract

The invention belongs to the technical field of structural composite materials, and provides boron carbide ceramic as well as a preparation method and application thereof. According to the boron carbide ceramic disclosed by the invention, the double-surface-modified continuous silicon carbide fiber fabric is used as a reinforcing body, and a reinforcing array is formed in a ceramic matrix; meanwhile, a titanium source on the surface of the continuous silicon carbide fiber fabric is firstly subjected to high-temperature pyrolysis, then is reduced into metal titanium through sintering under the assistance of an organic carbon source, and then reacts with the silicon carbide fiber and the boron carbide matrix to form coupling and bridging, so that the interface bonding strength between the continuous silicon carbide fiber fabric and the boron carbide matrix is improved; and in addition, the titanium source on the surface of the continuous silicon carbide fiber fabric can be converted into tough phases such as titanium carbide and titanium boride after being sintered, and a tough array is formed in the boron carbide matrix, so that the toughening effect is achieved. The embodiment shows that the bending strength and the fracture toughness of the obtained boron carbide ceramic are obviously improved; and when being used for body armor and bulletproof armor, the boron carbide ceramic is better in anti-multi-bullet capability.

Description

technical field [0001] The invention relates to the technical field of structural composite materials, in particular to a boron carbide ceramic and its preparation method and application. Background technique [0002] Boron carbide ceramics with light weight, high hardness, high temperature resistance and corrosion resistance are excellent materials for body armor and bulletproof armor. However, boron carbide ceramics are inorganic materials, and there are only covalent bonds between molecules, so they are brittle, which makes them easy to disintegrate and fragment when they are hit by bullets at high speed. Therefore, it is a consensus in the industry to improve the bending strength and fracture toughness of boron carbide ceramics, thereby improving their ballistic resistance. [0003] At present, the method of improving the bending strength or fracture toughness of boron carbide ceramics in the industry is usually to add a second phase to the boron carbide matrix, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/563C04B35/622F41H1/02F41H5/00
CPCC04B35/80C04B35/563C04B35/622F41H1/02F41H5/00C04B2235/5244C04B2235/524C04B2235/5454C04B2235/5445C04B2235/5436
Inventor 李亚东刘欢郑志礼彭斌袁林军
Owner 北京安达维尔航空设备有限公司