Method for preparing boron carbide ceramic composite material based on reaction sintering

A technology of boron carbide ceramics and composite materials, which is applied in the field of preparation of boron carbide ceramic composite materials and preparation of boron carbide ceramic composite materials based on reaction sintering, which can solve the damage of crystal structure integrity, adverse effects of mechanical property stability, and deterioration of ceramic mechanical properties To achieve the effect of protecting integrity, reducing production energy consumption and preparation cost, and improving hardness

Active Publication Date: 2015-12-09
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the process disclosed in this patent technology, while Si reacts with C in the green body, it will also react with B 4 C reacts, resulting in B in the biscuit 4 The integrity of the crystal structure of C is destroyed, which deteriorates the mechanical properties of ceramics and adversely affects the stability of mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing boron carbide ceramic composite materials based on reaction sintering, comprising the following steps:

[0031] Step 1: put 170 g of boron carbide powder with a particle size range of 40 to 100 μm, and 30 g of titanium powder with a particle size of less than 3 μm, and put them into a mixer and stir for 1 hour to obtain a uniformly mixed powder;

[0032] Step 2, put the mixed powder into a graphite container, put it into a vacuum furnace, and keep the vacuum degree not lower than 2×10 -3 Pa, after heat preservation treatment at 1000°C for 1 hour; pass the powder out of the furnace after cooling with the furnace through a 320-mesh vibrating sieve to remove the powder under the sieve, and obtain a composite boron carbide powder coated with a layer of metal titanium on the surface;

[0033] Step 3: Add 88g of composite boron carbide powder, 10g of carbon black powder, and 2g of phenolic resin powder into a ball mill, then pour 100ml of denatured alco...

Embodiment 2

[0037] A method for preparing boron carbide ceramic composite materials based on reaction sintering, comprising the following steps:

[0038] Step 1: put 160 g of boron carbide powder with a particle size range of 40 to 100 μm, and 40 g of titanium powder with a particle size of less than 3 μm, and put them into a mixer and stir for 2 hours to obtain a uniformly mixed powder;

[0039] Step 2, put the mixed powder into a graphite container, put it into a vacuum furnace, and keep the vacuum degree not lower than 2×10 -3 Pa, after heat preservation treatment at 900°C for 2 hours; pass the powder out of the furnace after cooling with the furnace through a 320-mesh vibrating sieve, remove the powder under the sieve, and obtain a composite boron carbide powder coated with a layer of metal titanium on the surface;

[0040]Step 3: Add 85g of composite boron carbide powder, 12g of carbon black powder, and 3g of phenolic resin powder into a ball mill, then pour 150ml of denatured alcoho...

Embodiment 3

[0044] A method for preparing boron carbide ceramic composite materials based on reaction sintering, the method specifically includes the following steps:

[0045] (1) According to the mass ratio of boron carbide powder and titanium powder is 15:0.5, boron carbide powder and titanium powder are placed in a mixer, stirred and mixed evenly to obtain a mixed powder;

[0046] (2) Put the mixed powder in a graphite container and put it into a vacuum furnace to control the vacuum degree ≥ 2×10 -3 Pa, and constant temperature treatment at 1000°C for 2 hours, cooling with the furnace, taking out the furnace, sieving the powder, removing the powder with a particle size of <3 μm, and obtaining a composite boron carbide powder coated with a layer of metal titanium on the surface;

[0047] (3) After mixing 85 parts of composite boron carbide powder, 5 parts of carbon black and 2 parts of phenolic resin in parts by weight, place them in a ball mill jar, then add ethanol and ball mill balls...

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Abstract

The invention relates to a method for preparing boron carbide ceramic composite material based on reaction sintering. The method comprises the following steps: depositing a layer of metallic titanium on the surface of boron carbide powder, mixing the boron carbide powder with carbon black powder, phenolic resin powder and industrial alcohol, carrying out ball milling, drying, granulating to obtain a precursor mixed powder, placing the precursor mixed powder in a die to produce a precursor pressed compact, disposing powdery or blocky silicon on the precursor pressed compact, placing the obtained compact in a vacuum furnace, carrying out silicon infiltration reaction sintering, cooling in a furnace, and removing superfluous silicon on the surface to obtain the boron carbide ceramic composite material. Compared with the prior art, the method has the advantages of simple process steps, effective solving of the problem of high temperature and high pressure sintering needed by routine technologies, low production energy consumption and preparation cost, and very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of bulletproof ceramics, and relates to a method for preparing a boron carbide ceramic composite material, in particular to a method for preparing a boron carbide ceramic composite material based on reaction sintering. Background technique [0002] At present, boron carbide ceramics is the material with the lowest density and the highest hardness among the human body protection materials that have been practically used. It has good bulletproof comprehensive performance and can maintain the combat mobility of equipment personnel to a large extent. Boron carbide itself has a series of excellent properties such as high hardness, high melting point, low density, high wear resistance, and high neutron absorption, and is widely used, but it also has two fatal weaknesses: one is difficult to sinter, due to carbonization Boron and carbon in boron ceramics are combined with strong covalent bonds (the composition of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/628
Inventor 吴晓林文松杨亚云
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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