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Boron carbide based bulletproof composite ceramic and preparation method thereof

The technology of boron carbide and boron carbide powder is applied in the field of low-density boron carbide-based composite bulletproof ceramics and its preparation, which can solve the problems of unfavorable mass production, long sintering time and high sintering temperature, achieve high elastic modulus, reduce sintering Effect of temperature, high strength elastic modulus

Inactive Publication Date: 2006-07-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the preparation of boron carbide bulletproof ceramics, there are still problems of high sintering temperature and long sintering time, which are not conducive to mass production and high product density.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The components of the composite bulletproof ceramic are as follows: 88 parts of boron carbide powder, 6 parts of silicon carbide whiskers, 5 parts of silicon powder, and 3 parts of boric acid, all in parts by weight. The obtained B of the boron carbide powder 4 C content>98%, d 50 95%. The silicon powder is d 50 <3μm industrial pure silicon powder.

[0020] The preparation method steps are as follows:

[0021] 1. According to the above weight parts, boron carbide powder, silicon carbide whiskers, silicon powder and boric acid are mixed by ball milling with absolute ethanol as the medium, and dried under vacuum condition. Prepare mixed powders.

[0022] 2. Add the above mixed powder into the graphite mold layer by layer, and separate the layers with graphite gasket and graphite paper.

[0023] 3. Put the above-mentioned mold filled with powder into a hot-pressing furnace for hot-pressing sintering at a temperature of 1800 ° C, with nitrogen as a protecti...

Embodiment 2

[0025] Embodiment 2: As described in embodiment 1, the difference is that the boride is boron gangue.

Embodiment 3

[0026] Example 3: The composition of the composite bulletproof ceramic is as follows: 95 parts of boron carbide powder, 15 parts of silicon carbide whiskers, 5 parts of silicon powder, and 2 parts of metal boron, all by weight.

[0027] The preparation method steps are as follows:

[0028] 1. According to the above weight parts, boron carbide powder, silicon carbide whiskers, silicon powder and metal boron are mixed by ball milling with absolute ethanol as the medium, and dried under vacuum condition. Prepare mixed powders.

[0029] 2. Put the above mixed powder into the graphite mold, and separate the layers with graphite gasket and graphite paper.

[0030] 3. Put the above-mentioned mold with powder into a hot-press furnace for hot-press sintering at a temperature of 1900°C, with argon as a protective gas; hot-press pressure of 30MPa, heat preservation and pressure for 30 minutes; natural cooling. A composite bulletproof ceramic with a thickness of 0.5 cm was obtained.

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Abstract

The preparation method for boron carbide composite bulletproof ceramics comprises: selecting the material by weight ratio as 85~95 boron carbide, 1~15 carborundum whisker, 2~15 silicon powder, and 1~5 boride; with anhydrous alcohol as medium, grinding and mixing the material; then drying in vacuum to prepare the mixed powder and add into the graphite mould with layers separated by graphite spacer and graphite paper; hot pressing and sintering with pressure as 30~40MPa at 1700~2000Deg. This product has low density, high strength and elastic modulus.

Description

(1) Technical field [0001] The invention relates to a low-density boron carbide-based composite bulletproof ceramic and a preparation method thereof, belonging to the technical field of protective materials. (2) Background technology [0002] In order to ensure the safety of the pilots and passengers of aviation vehicles in modern warfare, high-performance, low-density ceramic materials are required for protection in the design of aviation vehicles. High-quality bulletproof ceramics have also become the material of choice for preparing high-performance bulletproof vests. [0003] The best ceramic material for aerospace vehicle protection and body armor is boron carbide (B 4 C) ceramics. At present, advanced countries such as the United States have used boron carbide ceramic bulletproof plates in the equipment of aircraft such as helicopters. Boron carbide ceramics used as armor protection materials need to be sintered under high temperature and high pressure. In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
Inventor 张玉军谭砂砾张卫珂张兰
Owner SHANDONG UNIV
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