Silicon carbide whisker-toughened aluminum oxide composite ceramic material for bulletproof armor and preparation method thereof

A technology of silicon carbide whiskers and composite ceramics, which is applied to the structure of protective equipment, armor, armor plates, etc., can solve the problems of poor resistance to secondary and multiple impacts, difficult material mechanical properties, and low fracture toughness , to improve the ability to resist multiple impacts, enhance the protective effect and durability, and improve the impact toughness

Inactive Publication Date: 2020-11-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can improve the toughness of alumina ceramics to a certain extent, the fracture toughness of the prepared materials is still low, and the problem of poor resistance to secondary and multiple impacts ...

Method used

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  • Silicon carbide whisker-toughened aluminum oxide composite ceramic material for bulletproof armor and preparation method thereof
  • Silicon carbide whisker-toughened aluminum oxide composite ceramic material for bulletproof armor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, an alumina composite ceramic material for bulletproof armor toughened by silicon carbide whiskers with a volume fraction of silicon carbide whiskers of 30% was prepared. The raw materials used mainly include silicon carbide whiskers (average diameter 1μm, length range 10-100μm), alumina powder (average particle size 20nm), yttrium oxide powder (average particle size 30nm), deionized water, hydroxypropyl methyl Base cellulose powder (average particle size 180 μ m), polyvinyl alcohol, sodium lauryl sulfate and DarvanCN dispersant, Darvan CN dispersant is the slurry dispersant produced by U.S. Vanderbilt Company (R.T.Vanderbilt). Concrete preparation process is as follows:

[0028]1) Weigh 768g of deionized water, 13g of silicon carbide whiskers and 35g of alumina powder into a 1L ball mill jar in sequence, and after stirring evenly, add 3.8g of hydroxypropyl methylcellulose powder and 7.7g of polyethylene Alcohol and 2.4g of DarvanCN dispersant, then add...

Embodiment 2

[0033] In this example, an alumina composite ceramic material for bulletproof armor toughened by silicon carbide whiskers with a volume fraction of silicon carbide whiskers of 10% was prepared. The raw material used is identical with embodiment 1. Concrete preparation process is as follows:

[0034] 1) The difference between this step and step 1) in Example 1 is that the amount of deionized water used is 701g, the amount of silicon carbide whiskers added is 3.8g, the amount of aluminum oxide powder added is 40g, and the amount of hydroxypropyl The amount of methylcellulose powder added was 3.5 g, the amount of polyvinyl alcohol added was 7 g, and the amount of Darvan CN dispersant added was 5.8 g.

[0035] 2) This step is the same as step 2) in Example 1.

[0036] 3) This step is the same as step 3) in Example 1.

[0037] The aluminum oxide composite ceramic material for bulletproof armor toughened by silicon carbide whiskers with a volume fraction of silicon carbide whiske...

Embodiment 3

[0039] In this embodiment, the volume fraction of silicon carbide whiskers is 50% and the alumina composite ceramic material for bulletproof armor is toughened with silicon carbide whiskers. The raw material used is identical with embodiment 1. Concrete preparation process is as follows:

[0040] 1) The difference between this step and step 1) in Example 1 is that the amount of deionized water used is 896g, the amount of silicon carbide whiskers added is 26g, the amount of aluminum oxide powder added is 30g, and the amount of hydroxypropyl methyl The added amount of base cellulose powder is 4.5g, the added amount of polyvinyl alcohol is 9g, and the added amount of Darvan CN dispersant is 2.8g.

[0041] 2) This step is the same as step 2) in Example 1.

[0042] 3) This step is the same as step 3) in Example 1.

[0043] The aluminum oxide composite ceramic material for bulletproof armor toughened by silicon carbide whiskers with a volume fraction of silicon carbide whiskers o...

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Abstract

The invention relates to the field of composite materials for bulletproof armor, in particular to a silicon carbide whisker-toughened aluminum oxide composite ceramic material for bulletproof armor and a preparation method thereof. The composite ceramic material is composed of silicon carbide whiskers with a volume fraction of 5%-80% and aluminum oxide. Microscopically, the silicon carbide whiskers are preferentially arranged in an aluminum oxide matrix along a group of parallel planes. The preparation method of the composite ceramic material comprises the following steps: carrying out freezecasting and vacuum freeze drying treatment on water-based slurry containing the silicon carbide whiskers and the aluminum oxide powder to obtain a porous green body with an oriented lamellar structure, and sequentially carrying out pressure forming, organic matter removal and sintering densification treatment on the green body to obtain the aluminum oxide composite ceramic material toughened by the silicon carbide whiskers. The fracture toughness, impact toughness and repeated impact resistance of the composite ceramic material are remarkably improved compared with single silicon carbide ceramic and single aluminum oxide ceramic; and the composite ceramic material is expected to be applied to the field of bulletproof armor to effectively improve the protection capacity and durability of the bulletproof armor.

Description

technical field [0001] The invention relates to the field of composite materials for bulletproof armor, in particular to an alumina composite ceramic material for bulletproof armor toughened by silicon carbide whiskers and a preparation method thereof. Background technique [0002] With the rapid development of military science and technology in the world, bulletproof armor has been paid more and more attention by various countries. The research and development and production capacity of bulletproof armor materials is the embodiment of a country's military strength and an important guarantee for maintaining national security. High strength, high hardness, high toughness, and low density are important characteristics that high-quality bulletproof armor materials should have, and ceramic materials are widely used because of their high strength, high hardness, low density, good energy absorption, and wear resistance. In the field of bulletproof armor. At present, bulletproof ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/64F41H5/02
CPCC04B35/10C04B35/622C04B35/64C04B2235/3206C04B2235/3225C04B2235/3232C04B2235/3244C04B2235/3418C04B2235/5276F41H5/023
Inventor 刘增乾焦大张逸宁张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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