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B4C ceramic block body and rapid preparation method thereof

A ceramic block and fast technology, applied in the field of armor protection material preparation, can solve the problems of high temperature and long time, and achieve the effect of favorable performance, strong practicability, and favorable industrial production.

Active Publication Date: 2018-11-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hot pressing sintering can obtain dense sintered products, the temperature required for sintering is high (≥2100°C) and the time is long (≥1h). For example, D. Jianxin et al. used hot pressing sintering without adding sintering aids Means at 2100°C, B 4 C Ceramics; 2 o 3 As a sintering aid, almost dense B 4 Cceramics

Method used

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  • B4C ceramic block body and rapid preparation method thereof
  • B4C ceramic block body and rapid preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) 93g B 4 C powder, 5.16g Ti 3 SiC 2 Powder and 1.84g of Si powder were added to the ball mill tank of SM-QB planetary ball mill, and balls and excess absolute ethanol were added according to the ball-to-material ratio of 1:1; at a speed of 150r / min, ball milled for 3h, Mix evenly to obtain a mixed slurry; pour the mixed slurry into a vacuum rotary evaporator, and steam for 2.5 hours at a speed of 40r / min and a water bath temperature of 60°C to obtain a mixed powder precursor; put the mixed powder precursor Put it into an electric heating constant temperature blast drying oven, and dry at 30°C for 1 hour to obtain a mixed powder.

[0046] Wherein, the grinding ball is composed of a large agate ball and a small agate ball with a mass ratio of 0.1:1, the diameter of the large agate ball is 10 mm, and the diameter of the small agate ball is 1 mm.

[0047] (2) Put 100g of mixed powder into a graphite mold with an inner diameter of 25mm, then wrap the graphite mold with...

Embodiment 2

[0082] (1) Add 95g B 4 C powder, 3.68g Ti 3 SiC 2 Powder and 1.32g of Si powder were added to the ball milling tank of the SM-QB planetary ball mill, and balls and excess absolute ethanol were added according to the ball-to-material ratio of 3:1; at a speed of 300r / min, ball milled for 2h, Mix evenly to obtain a mixed slurry; pour the mixed slurry into a vacuum rotary evaporator, and steam it for 1 hour at a speed of 70r / min and a water bath temperature of 70°C to obtain a mixed powder precursor; put the mixed powder precursor into Dry at 50° C. for 0.7 h in an electric thermostat blast drying oven to obtain a mixed powder.

[0083] Wherein, the grinding ball is composed of a large agate ball and a small agate ball with a mass ratio of 1:1, the diameter of the large agate ball is 10 mm, and the diameter of the small agate ball is 5 mm.

[0084] (2) Put 100g of mixed powder into a graphite mold with an inner diameter of 25mm, then wrap the graphite mold with asbestos felt, p...

Embodiment 3

[0119] (1) 99.9g B 4 C powder, 0.074g Ti 3 SiC 2 Powder and 0.026g of Si powder are added to the ball mill tank of SM-QB planetary ball mill, and balls and excess absolute ethanol are added according to the ball-to-material ratio of 5:1; at a speed of 500r / min, ball mill for 0.5h , mixed evenly to obtain a mixed slurry; pour the mixed slurry into a vacuum rotary evaporator, and steam it for 0.2h at a speed of 100r / min and a water bath temperature of 80°C to obtain a mixed powder precursor; mix the mixed powder precursor Put it into an electric constant temperature blast drying oven, and dry at 80°C for 0.5h to obtain a mixed powder.

[0120] Wherein, the grinding ball is composed of a large agate ball and a small agate ball with a mass ratio of 10:1, the diameter of the large agate ball is 30mm, and the diameter of the small agate ball is 5mm.

[0121] (2) Put 100g of mixed powder into a graphite mold with an inner diameter of 25mm, then wrap the graphite mold with asbestos...

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Abstract

The invention relates to a B4C ceramic block body and a rapid preparation method thereof, and belongs to the field of preparation of an armor protective material. The ceramic block body comprises thefollowing components in percentage by mass: 90.8 to 99.87 percent of B4C, 0.078 to 5.52 percent of TiB2 and 0.052 to 3.68 percent of SiC. The preparation method comprises the following steps: ball-milling and mixing the B4C, Ti3SiC2 and Si powder uniformly; and sintering by a discharging plasma sintering system to obtain the ceramic block body. A discharging plasma sintering electric field can clean and activate the particle surface of mixed powder in the sintering process, so that the densification process of the mixed powder is conducted at low sintering temperature, the sintering time is greatly shortened and the density of the B4C ceramic block body obtained through sintering is up to 99.9 percent; furthermore, a second phase is generated, so that the B4C ceramic block body has excellent comprehensive mechanical property and can be applied in the field of a protective material.

Description

technical field [0001] The present invention relates to a B 4 C ceramic block and rapid preparation method thereof, specifically, relate to a kind of Ti 3 SiC 2 and Si as a sintering aid for B 4 The invention discloses a C ceramic block and a rapid preparation method thereof, which belong to the field of preparation of armor protection materials. Background technique [0002] B 4 The lattice structure of C is a rhombohedral structure, and the lattice structure belongs to n 5 3d -R 3m Lattice group, combined with each other by covalent bonds, is the third hardest material in the world, and it is a kind of superhard material in boron-rich compounds. Has excellent physical, chemical and mechanical properties, such as: low density (2.52g / cm 3 ), high hardness (35-45GPa), high melting point (2450°C), good oxidation resistance and corrosion resistance, high temperature thermoelectricity, high neutron absorption and scattering cross section, and high chemical stability. Du...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/65
CPCC04B35/563C04B35/65C04B2235/3813C04B2235/3826C04B2235/6562C04B2235/666C04B2235/77C04B2235/96
Inventor 张朝晖宋奇尹仕攀程兴旺胡正阳王浩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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