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Method for preparing high-purity boron carbide powder

A boron carbide powder and high-purity technology, which is applied in the field of boron carbide powder preparation, can solve the problems of difficult removal and no improvement in the purity of boron carbide, and achieve the effects of small footprint, easy equipment, and simple process steps

Inactive Publication Date: 2011-08-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has a low reaction temperature and saves energy, the disadvantage is that the residual magnesium oxide in the reactant must be washed off by an additional process, and it is difficult to completely remove it.
Although the thermal energy consumption is reduced, the boron carbide purity is not improved

Method used

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  • Method for preparing high-purity boron carbide powder
  • Method for preparing high-purity boron carbide powder
  • Method for preparing high-purity boron carbide powder

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] Take by weighing 198.6 milligrams of hexagonal boron nitride (h-BN), purity > 99.9wt%, and 24 milligrams of graphite (purity > 99.9wt%) powders with a balance, mix evenly by stirring, the mixed powder is placed in a graphite crucible, and The crucible is placed in the graphite heater, and the graphite heater is placed in the quartz glass tube of the radio frequency furnace, and the glass tube is evacuated to 10 -3 Pa, then feed high-purity argon gas (99.99%) at 1 atmospheric pressure, so that the argon gas is in circulation, and the graphite heater rapidly raises the temperature to 2100 ° C, and keeps the temperature at 2100 ° C for 1 hour.

[0018] Such as figure 1 , shows the x-ray diffraction pattern of the resulting powder sample, identified as B 4 C, there are no diffraction peaks of other impurities in the figure, and the chemic...

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Abstract

The invention discloses a method for preparing high-purity boron carbide powder, which is characterized by comprising the following steps: (1) uniformly mixing hexagonal boron nitride and graphite powder in a molar ratio of 4:1; and (2) under the protection of atmosphere, reacting the mixture for 1 to 3 hours, and controlling the temperature to between 1,800 and 2,300 DEG C. Compared with the prior art, the method has the advantages that the purity of the obtained boron carbide is over 99.6 weight percent through test and meets the requirement on high-purity boron carbide; and in addition, the whole process has simple steps, small floor area and available equipment and is easy for industrialization.

Description

technical field [0001] The invention relates to a preparation method of boron carbide powder. Background technique [0002] Boron carbide (B 4 C) is rhombohedral, lattice constant a=0.519nm, c=1.212nm, α=66°18'. Boron and carbon are mainly combined by covalent bonds (>90%), and its structure can be described as a cubic lattice extending in the direction of the diagonal in space, forming a fairly regular icosahedron at each corner. The widely accepted boron carbide model is: icosahedron composed of B11C and rhombohedral structure composed of C-B-C chains. It is precisely because of this special combination method that it has many excellent properties, such as: (1) high melting point, super hardness, its hardness is second only to diamond and cubic boron nitride in nature, it can be used as abrasive, resistant Grinding parts and manufacturing tank bulletproof armor; (2) low density, high temperature strength, and is being studied to use it as a cermet material for jet bl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/36
Inventor 诸葛飞李润伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI