Method for preparing nano twin crystal boron carbide powder

A technology of boron carbide powder and nano-twins, which is applied in the direction of chemical instruments and methods, nanotechnology, carbon compounds, etc., can solve the problems of low efficiency of nanometer and micron boron carbide powder, difficult removal of magnesium element, high cost, etc., and achieve the goal of preparing powder The effect of high body purity, uniform particle distribution and low cost

Active Publication Date: 2019-10-22
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, magnesium elements are often present in the boron carbide powder prepared by the magnesia thermal reduction method, which is difficult to remove completely.
(3) By the method of chemical reaction vapor deposition, boron trichloride and methane are reacted in a hydrogen atmosphere to obtain boron carbide powder. The obtained sample has high purity and small particle size, but the nanometer and Micron boron carbide powder has low efficiency and high cost

Method used

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  • Method for preparing nano twin crystal boron carbide powder
  • Method for preparing nano twin crystal boron carbide powder
  • Method for preparing nano twin crystal boron carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 100g of boric acid, put 46.1g of sucrose into a beaker, add 400ml of deionized water and stir to obtain a colorless and transparent solution.

[0043] The above colorless and transparent solution was placed on a flat heating platform, heated at 120°C and continuously stirred until the solution was evaporated to dryness to obtain a block product, which was ground into a powder.

[0044]Put the above-mentioned ground powder in a graphite crucible, put the graphite crucible in a tube furnace, first evacuate to a vacuum degree lower than 1e-2Pa, and heat it to 1500°C at a rate of 5°C / min. Keep it warm for 30 minutes, and obtain nano-twinned boron carbide powder after cooling. Such as figure 1 SEM image of the prepared nano-twinned boron carbide powder. It can be seen from the figure that the particle size distribution of the prepared boron carbide powder is uniform, and the average particle size is about 100nm. figure 2 The X-ray diffraction pattern of the prepare...

Embodiment 2

[0046] Weigh 205.8g of boric acid, put 100g of glucose into a beaker, add deionized water, mix and stir until the powder is completely dissolved, and a colorless and transparent solution is obtained.

[0047] Put the above aqueous solution on a flat heating platform and set the temperature at 150°C, stir continuously, heat and evaporate to dryness to obtain a block product, and grind the block product into a powder.

[0048] Put the above-mentioned ground powder in a graphite crucible, put the graphite crucible in a tube furnace, vacuumize to 1e-2Pa, turn on the heating system, raise the temperature to 1700°C at a rate of 10°C / min, and keep it warm for 10min. After cooling, nano-twinned boron carbide powder is obtained. Such as Figure 5 Shown is the scanning electron microscope picture of the prepared nano-twinned boron carbide powder. Figure 6 It is a transmission electron microscope bright field image of nano-twinned boron carbide powder.

Embodiment 3

[0050] Weigh 100 g of boric acid and 38 ml of glycerin into a beaker, add deionized water and stir to mix evenly to obtain a colorless transparent solution.

[0051] Put the above solution on a flat heating platform and set the temperature at 300°C, stir and heat until the solution is evaporated to dryness to obtain a block product, and then grind the block product into powder.

[0052] Put the above ground powder into a graphite crucible, heat the graphite crucible to 1450° C. in a tube furnace, hold the temperature for 120 minutes, and obtain nano-twinned boron carbide powder after cooling. Such as Figure 7 SEM image of the prepared nano-twinned boron carbide powder.

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Abstract

The invention discloses a method for preparing nano twin crystal boron carbide powder, and relates to the technical field of superfine ceramic powder preparation, and the method comprises the following steps: (1) using boric acid as a boron source and a carbon source, weighing the boron source and the carbon source, putting the boron source and the carbon source into deionized water, and uniformlystirring until the boron source and the carbon source are completely dissolved to obtain a colorless and transparent solution; (2) heating the obtained solution on a heating table until the solutionis evaporated to dryness, grinding obtained lumps into powder, and collecting for later use; (3) placing the powder in a graphite crucible, placing the graphite crucible in a tube furnace or a carbontube furnace, vacuumizing and then heating, setting the heating temperature at 1000-2000 DEG C, keeping the temperature for 0-180 min, and cooling to obtain the nano twin crystal boron carbide powder.According to the invention, the preparation difficulty of nano boron carbide powder is reduced, the product purity is improved, the yield is improved, the raw material price is low, the preparation process is simple, the prepared powder has high purity, small particle size, mild reaction conditions and low heating temperature.

Description

technical field [0001] The invention relates to the technical field of ultrafine ceramic powder preparation, in particular to a method for preparing nano-twin boron carbide powder. Background technique [0002] Boron carbide (B 4 C) is a low density (2.52g / cm 3 ), high melting point (2450°C) and extremely high hardness ceramic material, also has the advantages of high modulus, high neutron absorption cross section, etc., can be used as an excellent protective and wear-resistant material, making it widely used in many fields, Such as body armor, bullet-proof armor, knives, abrasives, high-temperature nozzle materials, control rods in nuclear reactions and radiation-proof materials, etc., boron carbide also plays an important role in lightweight bullet-proof armor materials. Due to the strong covalent bond of boron carbide, the large resistance to grain boundary movement during sintering and the low surface tension in solid state, boron carbide is an extremely difficult to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991B82Y30/00B82Y40/00
CPCC01B32/991B82Y30/00B82Y40/00C01P2006/80C01P2004/62C01P2004/64C01P2002/60
Inventor 赵智胜李鹏辉马梦冬何巨龙于栋利田永君徐波柳忠元胡文涛
Owner YANSHAN UNIV
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