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Boron carbide micro powder and preparation method thereof

A boron carbide and micropowder technology, which is applied in the field of boron carbide micropowder and its preparation, can solve the problems of not preparing boron carbide and the like, and achieve the effects of rapid reaction, simplified preparation process and low reaction temperature

Inactive Publication Date: 2010-08-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no process for preparing boron carbide using bamboo charcoal powder as a carbon source

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, a kind of preparation method of boron carbide micropowder is characterized in that comprising the following steps:

[0014] 1), under room temperature, with diboron trioxide and average particle diameter, be that 0.1 μm bamboo charcoal micropowder carries out batching according to diboron trioxide: carbon=2: 7 molar ratio; Then earlier mechanical ball milling (raw material: the weight ratio of ball milling medium 1:2) for 2 hours, and then through the collision type airflow pulverization ball mill (grinding pressure 0.7MPa, classification wheel frequency 40 Hz) once, through the above-mentioned impact, shearing, friction, etc., to achieve sufficient mixing and high activation of raw materials , to obtain a homogeneous composite precursor;

[0015] 2) Put the homogeneous composite precursor into a graphite crucible and place it in a vacuum sintering furnace, heat it at 2000°C for 4 hours, and take it out after cooling to obtain boron carbide micropowder. I...

Embodiment 2

[0016] Embodiment 2, a kind of preparation method of boron carbide micropowder is characterized in that comprising the following steps:

[0017] 1), the average particle diameter of bamboo charcoal micropowder is changed into 0.3 μm, all the other are with embodiment 1.

[0018] 2) Put the homogeneous composite precursor into a graphite crucible and place it in a vacuum sintering furnace, heat it at 2200°C for 1 hour, and take it out after cooling to obtain boron carbide micropowder. It is determined that the particle size of the powder is 0.1-2um, and the purity is over 99%.

Embodiment 3

[0019] Embodiment 3, a kind of preparation method of boron carbide micropowder is characterized in that comprising the following steps:

[0020] 1), the average particle diameter of bamboo charcoal micropowder is changed into 0.5 μm, all the other are with embodiment 1.

[0021] 2) Put the homogeneous composite precursor into a graphite crucible and place it in a vacuum sintering furnace, heat it at 2100°C for 2 hours, and take it out after cooling to obtain boron carbide micropowder. It is determined that the particle size of the powder is 0.1-2um, and the purity is over 99%.

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Abstract

The invention discloses a preparation method of a boron carbide micro powder, which comprises the following steps: 1) mixing boron trioxide with bamboo carbon micro powder in the molar ratio of 2 to 7 at room temperature; and then mechanically grinding and crushing the mixture so as to obtain a homogeneous composite precursor; and 2) heating the homogeneous composite precursor in a vacuum sintering furnace for 1 to 4 hours at the temperature of 2,000 to 2,200 DEG C; and cooling the sintered product and taking the cooled product out so as to obtain boron carbide micro powder. The invention also provides the boron carbide micro powder prepared by the method. The boron carbide micro powder prepared by the method has the characteristics of high purity and controllable particle size distribution.

Description

technical field [0001] The invention relates to a boron carbide powder and a preparation method thereof, in particular to a boron carbide micropowder and a preparation method thereof. Background technique [0002] Boron carbide is an important special ceramic with many excellent properties. Due to its incomparable excellent performance with other materials, the depth and intensity of research on boron carbide ceramics are increasing. The hardness of boron carbide is second only to diamond and cubic boron nitride in nature, especially its nearly constant high-temperature hardness (>30GPa) is unparalleled by other materials, so it has become an important member of the superhard material family. In boron carbide, boron and carbon are mainly combined by covalent bonds (>90%), which has a high melting point (2450°C), high hardness, high modulus, and low density (2.52g / cm 3 ), good wear resistance, strong acid and alkali resistance, etc., and has good neutron and oxygen ab...

Claims

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Application Information

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IPC IPC(8): C01B31/36C04B35/565
Inventor 郭兴忠杨辉朱林
Owner ZHEJIANG UNIV
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