Preparation method for synthesizing boron carbide powder at low temperature

A boron carbide and powder technology, which is applied in the field of low-temperature synthesis and preparation of boron carbide powder, can solve the problems of high product purity, high cost, and difficulty in removing magnesium oxide, and achieves the effects of low preparation cost and low energy.

Inactive Publication Date: 2010-11-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-propagating high-temperature synthesis method uses magnesium as a flux. After mixing magnesium powder, carbon black and boric acid, they react at 1700°C to form boron carbide powder. The particle size of the resulting product is small, but the magnesium oxide in the product is difficult to proces

Method used

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  • Preparation method for synthesizing boron carbide powder at low temperature
  • Preparation method for synthesizing boron carbide powder at low temperature
  • Preparation method for synthesizing boron carbide powder at low temperature

Examples

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Embodiment 1

[0022] In this embodiment, 24 grams of boric acid are placed in a beaker, 20 milliliters of glycerol is added into the beaker and stirred evenly with a glass rod, the beaker with the liquid is placed in an ultrasonic cleaner, and the heating temperature is set to 85°C, working frequency 40kHz, ultrasonic power 100W, after ultrasonic oscillation for 20 minutes, boric acid is completely dissolved in glycerol and forms a transparent liquid, add 1.6 grams of 24 nanometer activated carbon powder to the transparent liquid, and continue to ultrasonic Shake for 15 minutes to make a uniform mixed liquid.

[0023] The mixed liquid was transferred to a crucible, and the crucible was put into a tube furnace to be heated in air at a heating temperature of 550° C., a holding time of 0.5 hour, and a heating rate of 5° C. / min.

[0024] The product obtained after heating was ground with an agate mortar to form particles with a particle size of less than 1 mm.

[0025] The particles are put in...

Embodiment 2

[0030] In this embodiment, 16 grams of boric acid are placed in a beaker, 10 milliliters of glycerol is added into the beaker and stirred evenly with a glass rod, the beaker of the liquid is placed in an ultrasonic cleaner, and the heating temperature is set to 95°C, working frequency 40kHz, ultrasonic power 90W, after ultrasonic oscillation for 30 minutes, boric acid is completely dissolved in glycerol and forms a transparent liquid, add 1.6 grams of 24 nanometer activated carbon powder to the transparent liquid, and continue to ultrasonic Shake for 30 minutes to make a uniform mixed liquid.

[0031] The mixed liquid was transferred to a crucible, and the crucible was put into a tube furnace to be heated in air at a heating temperature of 450° C., a holding time of 2 hours, and a heating rate of 5° C. / min.

[0032] The product obtained after heating was ground with an agate mortar to form particles with a particle size of less than 1 mm.

[0033] The particles are put into a...

Embodiment 3

[0038] In this embodiment, 24 grams of boric acid are placed in a beaker, 30 milliliters of glycerol is added into the beaker and stirred evenly with a glass rod, the beaker with the liquid is placed in an ultrasonic cleaner, and the heating temperature is set to 75°C, working frequency 40kHz, ultrasonic power 80W, after 15 minutes of ultrasonic oscillation, the boric acid is completely dissolved in glycerol and forms a transparent liquid, add 1.2 grams of 24 nanometer activated carbon powder to the transparent liquid, and continue to ultrasonic Shake for 10 minutes to make a homogeneous mixed liquid.

[0039] The mixed liquid was transferred to a crucible, and the crucible was put into a tube furnace to be heated in air at a heating temperature of 650° C., a holding time of 3 hours, and a heating rate of 8° C. / min.

[0040] The product obtained after heating was ground with an agate mortar to form particles with a particle size of less than 1 mm.

[0041] The particles are p...

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Abstract

The invention discloses a preparation method for synthesizing boron carbide powder at a low temperature, and belongs to the field of boron carbide ceramic material. The method comprises the following steps of: mixing boric acid, glycerol and nano active carbon powder in a certain ratio by using an ultrasonic cleaner; heating the mixed liquid in a tube furnace under the condition of the heating temperature of 450 to 700 DEG C, the heat preservation time of 0.5 to 3 hours and the heating rate of 5 to 10 DEG C per minute; grinding the heated product by using an agate mortar to form granules with a granule diameter less than 1 millimeter; filling the granules into a graphite jar with screw threads, and screwing down the graphite jar; treating the graphite jar in a vacuum or argon atmosphere at a high temperature, heating the graphite jar to between 1,400 and 1,500 DEG C at a heating rate of 10 to 20 DEG C per minute, preserving the heat for 1 to 5 hours, and cooling the product along with the furnace; and screening the obtained product to obtain the boron carbide powder with the granule diameter less than 10 microns. The whole process has low energy consumption and low preparation cost, and does not introduce exogenous impurities.

Description

technical field [0001] The invention belongs to the field of boron carbide ceramic material production, in particular to a method for preparing boron carbide powder by low-temperature synthesis. Background technique [0002] Boron carbide is a ceramic material with a wide range of uses. The most prominent feature of boron carbide is its extremely high hardness. Its Mohs hardness is 9.36, second only to diamond and cubic boron nitride. In addition, boron carbide also has a low density and a melting point. High, high temperature strength, good chemical stability, good neutron absorption capacity, excellent thermoelectric performance, low expansion coefficient and other characteristics, therefore, boron carbide can be used to prepare bulletproof armor, cutting tools, special acid and alkali resistance Erosion materials, thermocouples, and atomic reactor control and shielding materials. [0003] At present, there are two main types of industrial boron carbide powder preparation...

Claims

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Application Information

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IPC IPC(8): C01B35/02
Inventor 沈卫平马明亮王青云
Owner UNIV OF SCI & TECH BEIJING
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