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Liquid-phase sintered boron carbide bulletproof material and preparation method thereof

A technology of liquid phase sintering and boron carbide, which is applied in the field of liquid phase sintering boron carbide bulletproof materials and its preparation, can solve the problems of low service life, complex process, large heat loss, etc., and achieve cost reduction and follow-up processing costs and increase Dimensional accuracy and the effect of improving ballistic performance

Active Publication Date: 2014-08-13
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are about 93% covalent bonds in the crystal structure of boron carbide, it is very difficult to sinter boron carbide materials
Usually, hot pressing and sintering at 2300°C can obtain denser boron carbide materials. In addition, boron carbide is a very brittle material, and the fracture toughness of pure boron carbide is only 2.2MPa m 1 / 2 , due to the above disadvantages, the wide application of boron carbide is limited
[0004] At present, to improve the sintering performance of boron carbide materials at home and abroad, by directly adding TiB 2 , SiC, C, Al 2 o 3 And the method of metal Ti, Al etc., make sintering temperature reduce to 1700-1800 ℃; For the manufacturing technology of ceramic composite material, mainly contain hot pressing sintering and pressureless sintering technology, these two kinds of technologies have the following problems: 1. The production cost of pressing and sintering boron carbide is high, the service life of graphite mold is low, the heat loss is large, and the electricity cost is high; 2. Boron carbide hot pressing and sintering technology can only produce products with simple shapes, which cannot meet the market demand for products with complex shapes; 3 1. The production efficiency of hot-pressed sintered boron carbide is low, which cannot meet the needs of mass production; 4. The dimensional accuracy of hot-pressed sintered boron carbide blank is poor, and the subsequent processing costs are high; 5. The technical performance index of pressureless sintered boron carbide is low, which cannot meet the market Demand for high-quality products; 6. The content of pure boron carbide in pressureless sintered boron carbide products is low, and the service life is low, which cannot meet market demand
However, the composite material is reduced to about 30Gpa, and the process is complicated and the cost is high.

Method used

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  • Liquid-phase sintered boron carbide bulletproof material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh the liquid-phase sintered boron carbide bulletproof material composition and its mass percentage described in Table 1 Example 1, and the weighed boron carbide, α-Si 3 N 4 , α-SiC and carbon black are put into a ball mill, wet-milled with deionized water as a medium, and a binder phenolic resin that accounts for 10% of the mass of the slurry is added. After 4 hours, the ball-milled slurry is passed through a 120-mesh screen. ;

[0033] The sieved slurry is sprayed and granulated through a spray granulation tower. During spray granulation, the inlet temperature of the granulation tower is 200 °C, the outlet temperature is 100 °C, the speed of the feeding pump is 80r / min, and the speed of the atomizing disc is 14000r. / min, pass the granulated slurry through a 60-mesh sieve for later use;

[0034] The above-mentioned granulated slurry is loaded into the mold cavity, and is formed by dry pressing under the pressure of 50MPa, and the pressure holding time is 15s to p...

Embodiment 2

[0037] Weigh the liquid phase sintered boron carbide bulletproof material composition and its mass percentage described in Example 2 of Table 1, and the weighed boron carbide, α-Si 3 N 4 , α-SiC and carbon black are put into a ball mill, wet-milled with deionized water as a medium, and a binder phenolic resin that accounts for 5% of the mass of the slurry is added. After 2 hours, the ball-milled slurry is passed through a 120-mesh screen. ;

[0038] The sieved slurry is sprayed and granulated through a spray granulation tower. During spray granulation, the inlet temperature of the granulation tower is 170 °C, the outlet temperature is 75 °C, the speed of the feeding pump is 35r / min, and the speed of the atomizing disc is 14000r. / min, pass the granulated slurry through a 60-mesh sieve for later use;

[0039] The above-mentioned granulated slurry is loaded into the mold cavity, and is formed by dry pressing under the pressure of 35MPa, and the pressure holding time is 5s to p...

Embodiment 3

[0042] Weigh the liquid phase sintered boron carbide bulletproof material composition and its mass percentage described in Table 1 Example 3, and the weighed boron carbide, α-Si 3 N 4 , α-SiC and carbon black are put into a ball mill, wet-milled with deionized water as a medium, and a binder phenolic resin that accounts for 14% of the slurry mass is added. After 6 hours, the ball-milled slurry is passed through a 120-mesh screen. ;

[0043] The sieved slurry is sprayed and granulated through a spray granulation tower. During spray granulation, the inlet temperature of the granulation tower is 240 °C, the outlet temperature is 120 °C, the speed of the feeding pump is 100r / min, and the speed of the atomizing disc is 14000r. / min, pass the granulated slurry through a 60-mesh sieve for later use;

[0044] The above-mentioned granulated slurry is loaded into the mold cavity, and is formed by dry pressing under the pressure of 100MPa, and the pressure holding time is 20s to prepar...

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Abstract

The invention relates to a liquid-phase sintered boron carbide bulletproof material and a preparation method thereof. The bulletproof material comprises the following components by mass: 60 to 98% of boron carbide, 1 to 20% of alpha-Si3N4, 1 to 10% of alpha-SiC, 0 to 3% of carbon black and 0 to 25% of an Al-Y additive. The preparation method comprises the following steps: weighing raw materials, putting the weighed boron carbide, alpha-Si3N4, alpha-SiC and carbon black into a bowl mill and successively carrying out wet milling with deionized water as a medium and screening; then carrying out spray granulation and screening; subjecting obtained slurry to dry-pressing molding so as to prepare a green body; and finally, subjecting a processed biscuit to sintering in the presence of the Al-Y additive under the protection of argon so as to prepare the liquid-phase sintered boron carbide bulletproof material. The bulletproof material provided by the invention has volume density of 2.59 to 2.72 g / cm3 and good hardness, bending strength, breaking tenacity, elasticity modulus, etc., production cost is low, and production efficiency is high.

Description

technical field [0001] The invention relates to a liquid-phase sintered boron carbide bulletproof material and a preparation method thereof, belonging to the technical field of material synthesis. Background technique [0002] Ceramic materials have excellent comprehensive properties such as high strength, high hardness, high temperature resistance, oxidation resistance, low high temperature creep performance, excellent wear resistance at high temperature, low thermal expansion coefficient, and low density. It is obviously superior to metal materials, polymer materials and their composite materials in terms of , dynamic effects, etc., and has been practically applied in military protection, and has become one of the three leading materials in armor protection. All countries in the world attach great importance to the research of ceramic composite bulletproof materials, which mainly focus on ceramic-metal composite, ceramic-polyester sheet composite, steel-ceramic-steel compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 李友宝励永平
Owner NINGBO DONGLIAN MECHANICAL SEAL
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