Boron carbide-silicon carbide complex ceramic and preparation method thereof

A technology of boron carbide, silicon carbide, and multiphase ceramics, which is applied in the field of ceramic materials, can solve problems such as difficulty in solving, hindered development, poor wettability of aluminum melt, etc., and achieves excellent mechanical properties and avoids the effect of aluminum carbide formation.

Active Publication Date: 2011-10-19
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Another way to develop and apply boron carbide is to obtain boron carbide / aluminum composite material from aluminum melt-infiltrated boron carbide powder preform. However, due to the poor wettability of aluminum melt, aluminum is easy to react with boron carbide to produce brittle phase aluminum carbide. The difficulty of solving the problem is relatively large, which hinders the development of this technology

Method used

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  • Boron carbide-silicon carbide complex ceramic and preparation method thereof
  • Boron carbide-silicon carbide complex ceramic and preparation method thereof
  • Boron carbide-silicon carbide complex ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The raw materials of the prefabricated body are as follows (by weight percentage):

[0053] Boron carbide powder with a particle size of 50-100 microns 75% Boron carbide powder with a particle size of 2-10 microns 15%

[0054] Graphite powder 3.0% Activated carbon powder 4.0%

[0055] Phenolic resin 1.5% Tetramethylammonium hydroxide 0.5%

[0056] Motor oil 0.3% glycerin 0.7%;

[0057] The weight percent of the above-mentioned boron carbide powder is based on pure boron carbide.

[0058] Alloy composition: 80% silicon, 20% aluminum.

Embodiment 2

[0060] The raw materials of the prefabricated body are as follows (by weight percentage):

[0061] Boron carbide powder with a particle size of 50-100 microns 75% Boron carbide powder with a particle size of 2-10 microns 15%

[0062] Graphite powder 3.0% Activated carbon powder 4.0%

[0063] Phenolic resin 1.5% Tetramethylammonium hydroxide 0.5%

[0064] Motor oil 0.3% glycerin 0.7%;

[0065] The weight percent of the above-mentioned boron carbide powder is based on pure boron carbide.

[0066] Alloy composition: 55% silicon, 45% aluminum.

Embodiment 3

[0068] The raw materials of the prefabricated body are as follows (by weight percentage):

[0069] Boron carbide powder with a particle size of 50-100 microns 75% Boron carbide powder with a particle size of 2-10 microns 15%

[0070] Graphite powder 3.0% Activated carbon powder 4.0%

[0071] Phenolic resin 1.5% Tetramethylammonium hydroxide 0.5%

[0072] Motor oil 0.3% glycerin 0.7%;

[0073] The weight percent of the above-mentioned boron carbide powder is based on pure boron carbide.

[0074] Alloy composition: 36% silicon, 64% aluminum.

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Abstract

The invention relates to the field of ceramic materials and in particular relates to a boron carbide-silicon carbide complex ceramic and a preparation method thereof. The boron carbide-silicon carbide complex ceramic is prepared through the following steps: degreasing a boron carbide and carbon mixed powder preform and then carrying out alloy infiltration reactive sintering on the degreased preform, wherein the boron carbide and carbon mixed powder preform comprises 85wt%-98wt% of boron carbide, 1.0wt%-14.0wt% of carbon and an organic bonding agent with a use amount for prefabrication and formation; and alloy is composed of 12.5wt% of silicon and 5wt%-87.5wt% of aluminum. According to the invention, a technology combining infiltration with reactive sintering is adopted, and a bidirectional interconnection microstructure is formed, so that the product has high mechanical property and can resist shooting of bullets; and the complex ceramic is low in density, is an optimal bulletproof and armour material, and is mainly applied to low-density high-property materials in the bulletproof and armour fields.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a boron carbide silicon carbide composite ceramic and a preparation method thereof. Background technique [0002] Boron carbide (B 4 C) is an unfixed stoichiometric covalent bond compound with an open polymorphic crystal structure. Its specific gravity is light, its strength is high, its hardness is second only to diamond and cubic boron nitride, its melting point is high, and its neutron absorption is strong. The above characteristics make boron carbide ceramics a potentially important structural candidate material, especially suitable for light armor and nuclear reactor shielding materials. [0003] Boron carbide is a material with excellent performance, but because of its covalent bond structure, its self-diffusion coefficient is small, and sintering is extremely difficult. Most traditional boron carbide ceramics are obtained by hot pressing, hot isostatic pressing and conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 方宁象高明霞潘颐张国军巫红燕周红良
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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