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Method for preparing nano boron powder

A nano-boron and B2O3 technology is applied in the field of preparation of nano-boron powder, which can solve the problems of high consumption of raw materials for thermal explosion reaction, limited effect of regulating reaction, and difficulty in improving the purity and particle size of boron powder.

Inactive Publication Date: 2010-10-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have limited effects on regulating the reaction, and the method of adopting excessive reactants will also lead to thermal explosion reaction and excessive consumption of raw materials, and it is difficult to significantly improve the purity and particle size of boron powder

Method used

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  • Method for preparing nano boron powder
  • Method for preparing nano boron powder
  • Method for preparing nano boron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 27.38 g of B 2 o 3 , 23.64 g Mg, 7.52 g KBH 4 , the endothermic reaction rate is 30%, then the raw material mass ratio B 2 o 3 :Mg:KBH 4 1:0.86:0.28, where the B 2 o 3 It is industrial diboron trioxide powder, the size is 100-300 mesh; Mg is industrial magnesium powder, the size is 100-300 mesh; KBH 4 The purity is 96wt.%, and the size is 100-300 mesh. Add the weighed raw materials into a high-speed mixer (18000 rpm), mix for 6 minutes, and make it evenly mixed; put the mixture into a reaction tank, vibrate it and put it into an argon-protected heating furnace, and heat it at 830 Incubate at ℃ for 13 minutes to initiate a self-propagating reaction; take out the crude reaction product, add excess 0.5M hydrochloric acid to soak the crude product, and then heat and stir at 60℃ for 8 hours to dissolve impurities in the product, suction filter, wash with water several times, and filter cake Vacuum drying at 80° C. for 12 hours yielded 8.68 grams of nano-boron p...

Embodiment 2

[0041] Weigh 22.57 g of B 2 o 3 , 13.52 g Mg, 15.03 g KBH 4 , the endothermic reaction rate is 60%, then the raw material mass ratio B 2 o 3 :Mg:KBH 4 1:0.60:0.67, where the B 2 o 3 It is industrial diboron trioxide powder, the size is 100-300 mesh; Mg is industrial magnesium powder, the size is 100-300 mesh; KBH 4 The purity is 97wt.%, and the size is 100-300 mesh. Add the weighed raw materials into a high-speed mixer (18,000 rpm), mix for 10 minutes, and make it evenly mixed; put the mixture into a reaction tank, vibrate it and place it in an argon-protected heating furnace, and heat it at 800 Incubate at ℃ for 15 minutes to initiate a self-propagating reaction; take out the crude reaction product, add 0.5M hydrochloric acid to soak the crude product, and then heat and stir at 60℃ for 12 hours to dissolve impurities in the product, suction filter and wash with water several times, and filter cake at 80 ℃ vacuum drying for 16 hours to obtain 8.89 g of nano boron powde...

Embodiment 3

[0043] Weigh 25.80 g of B 2 o 3 , 20.27 g Mg, 10.05 g KBH 4 , the endothermic reaction rate is 40%, then the raw material mass ratio B 2 o 3 :Mg:KBH 4 1:0.79:0.39, where the B 2 o 3 It is industrial diboron trioxide powder, the size is 100-300 mesh; Mg is industrial magnesium powder, the size is 100-300 mesh; KBH 4 The purity is 96wt.%, and the size is 100-300 mesh. Add the weighed raw materials into a high-speed mixer (18000 rpm), mix for 12 minutes, and make it evenly mixed; put the mixture into a reaction tank, vibrate it and place it in an argon-protected heating furnace, and heat it at 750 Incubate at ℃ for 15 minutes to initiate a self-propagating reaction; take out the crude reaction product, add 5M hydrochloric acid to soak the crude product, and then heat and stir at 60℃ for 16 hours to dissolve the impurities in the product, suction filter, wash with water several times, and filter the cake at 80℃ Vacuum dried for 24 hours to obtain 8.67 grams of nano-boron p...

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Abstract

The invention relates to a method for preparing nano boron powder. B203, Mg and KBH4 are taken as reaction materials, and mixed at the protection of argon at the temperature of 700-850 DEG C to trigger the self-propagating reaction; and the obtained reaction rough product is separated and purified to obtain the nano boron powder. The method of the invention has the following beneficial effects: (1) reactivity diluent KBH4 is added in a B203 / Mg system on the basis of synthesizing boron powder by traditional magnesiothermic reduction and by virtue of endothermic reaction, so as to control heat effect of the reaction system, realize energy conserving effect and control self-propagating reaction temperature, thus restraining side reaction and by-product impurities, effectively improving the purity of the product and acquiring amorphous boron powder with higher purity; (2) reaction product particles are avoided from sintering and agglomerating due to the generation of H2O and H2; realizing to refine and control boron powder granularity to prepare the nano boron powder; and (3) the method of the invention has moderate and controllable reaction conditions, simple process and reduced energy consumption, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of preparation of ceramic materials, in particular to a preparation method of nano boron powder. Background technique [0002] The combustion calorific value of elemental boron is about 58.81MJ / kg, more than double that of elemental carbon, about 1.9 times that of aluminum, and 2.3 times that of magnesium, and its volumetric calorific value reaches 137.94KJ / cm 3 , about three times that of hydrocarbon fuels, 1.66 times that of aluminum, and 3.09 times that of magnesium. Amorphous boron powder has the advantages of large specific surface area, high combustion calorific value, no pollution, and convenient portability. It is often used as boron-rich solid fuel and widely used in military and military fields such as aerospace, missile solid propellant, and new metallurgical material synthesis. Amorphous boron powder is also used in the igniter of automobile airbags, the neutron absorber of nuclear reactors, and in the fi...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/626
Inventor 谷云乐王吉林张来平张占辉钱琼丽
Owner WUHAN INSTITUTE OF TECHNOLOGY
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