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A kind of high toughness pressureless sintered boron carbide bulletproof material and preparation method thereof

A boron carbide and high toughness technology, applied in the field of high toughness pressureless sintered boron carbide bulletproof material and its preparation, can solve the problems of limiting the wide application of boron carbide, difficult sintering of boron carbide materials, complicated processes, etc., and achieves high cost performance, high density Small, good ballistic performance

Active Publication Date: 2015-09-23
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 2.2MPam. 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. reduces the sintering temperature to 1700-1800°C, but the hardness of the material drops below 30Gpa, and the fracture toughness is only 2.5-3.2MPam 1 / 2 , and the process is complicated and the cost is high

Method used

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  • A kind of high toughness pressureless sintered boron carbide bulletproof material and preparation method thereof
  • A kind of high toughness pressureless sintered boron carbide bulletproof material and preparation method thereof
  • A kind of high toughness pressureless sintered boron carbide bulletproof material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh the composition and mass percentage of the high-toughness pressureless sintered boron carbide bulletproof material as described in Example 1 of Table 1, and put the weighed boron carbide, TiC, α-SiC, and carbon black into a ball mill to remove Ionized water is used as the medium for wet grinding. During the wet grinding process, a binder phenolic resin accounting for 5-15% of the mass of the slurry is added. After wet grinding for 1-3 hours, the slurry passes through a 120-mesh screen;

[0029] The sieved slurry is sprayed and granulated through the spray granulation tower. During the spray granulation, the inlet temperature of the granulation tower is 180-230°C, the outlet temperature is 85-120°C, and the speed of the feeding pump: 45-90r / min , the rotation speed of the atomizing disc is 14000r / min, and the granulated slurry is passed through a 60-mesh sieve for later use;

[0030] Put the above-mentioned granulated slurry into the cavity of the mold, dry press m...

Embodiment 2

[0033] Weigh the composition and mass percentage of the high-toughness pressureless sintered boron carbide bulletproof material as described in Example 1 of Table 1, and put the weighed boron carbide, TiC, α-SiC, and carbon black into a ball mill to remove Ionized water is used as the medium for wet grinding. During the wet grinding process, a binder phenolic resin accounting for 5-15% of the mass of the slurry is added. After wet grinding for 1-3 hours, the slurry passes through a 120-mesh screen;

[0034] The sieved slurry is sprayed and granulated through the spray granulation tower. During the spray granulation, the inlet temperature of the granulation tower is 180-230°C, the outlet temperature is 85-120°C, and the speed of the feeding pump: 45-90r / min , the rotation speed of the atomizing disc is 14000r / min, and the granulated slurry is passed through a 60-mesh sieve for later use;

[0035] Put the above-mentioned granulated slurry into the cavity of the mold, dry press m...

Embodiment 3

[0038] Weigh the composition and mass percentage of the high-toughness pressureless sintered boron carbide bulletproof material as described in Example 1 of Table 1, and put the weighed boron carbide, TiC, α-SiC, and carbon black into a ball mill to remove Ionized water is used as the medium for wet grinding. During the wet grinding process, a binder phenolic resin accounting for 5-15% of the mass of the slurry is added. After wet grinding for 1-3 hours, the slurry passes through a 120-mesh screen;

[0039] The sieved slurry is sprayed and granulated through the spray granulation tower. During the spray granulation, the inlet temperature of the granulation tower is 180-230°C, the outlet temperature is 85-120°C, and the speed of the feeding pump: 45-90r / min , the rotation speed of the atomizing disc is 14000r / min, and the granulated slurry is passed through a 60-mesh sieve for later use;

[0040] Put the above-mentioned granulated slurry into the cavity of the mold, dry press m...

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Abstract

The invention relates to a high-toughness pressurelessly sintered boron carbide bulletproof material and a preparation method thereof, belonging to the technical field of material synthesis. The bulletproof material comprises, by mass, 70 to 95% of boron carbide, 0.5 to 15% of TiC, 1 to 15% of alpha-SiC and 0 to 2% of carbon black. The preparation method comprises the following steps: weighing raw materials, putting the weighed boron carbide, TiC, 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 under the protection of argon and carrying out grinding and polishing so as to prepare the high-toughness pressurelessly sintered boron carbide bulletproof material. The bulletproof material provided by the invention has volume density of 2.50 to 2.59 g / cm3 and good hardness, bending strength, breaking tenacity, elasticity modulus, etc.

Description

technical field [0001] The invention relates to a high-toughness pressureless sintered boron carbide bulletproof material and a preparation method thereof, belonging to the technical field of material synthesis. Background technique [0002] With the large-scale development of lethal weapons in modern warfare, earlier bulletproof materials can no longer meet the performance requirements of bulletproof materials. It is of great national defense strategic significance to seek bulletproof materials with superior performance. Metal materials, as early bulletproof materials, have the disadvantages of being easily penetrated by bullets and having low bulletproof coefficients, and the density of metal is high, and its thickness cannot be increased arbitrarily, otherwise the combat capability of soldiers will plummet. Ceramic materials have excellent comprehensive properties such as high strength, high hardness, high temperature resistance, oxidation resistance, low high temperatur...

Claims

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Application Information

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