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Method for preparing hollow nano-structure boron carbide

A hollow nano, boron carbide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large particle size of boron carbide powder, complicated preparation process and low product purity, etc. Strong anti-oxidation ability, complete and complete reaction, and the effect of reducing the reaction diffusion barrier

Inactive Publication Date: 2016-11-23
郭舒洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high arc temperature and the large temperature difference in the furnace zone, the boron carbide powder produced has a large particle size and generally high impurity content. Usually, ball milling or other crushing methods are required to prepare the boron carbide powder required for sintering. Therefore, It is often accompanied by process steps such as pickling, which makes the preparation process more complicated, and the purity of the product is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Firstly, weigh 2kg of fresh pig manure, pile and retting at room temperature for 50 days to obtain decomposed pig manure, then weigh 8kg of corn stalks, spread them evenly under the sun, and expose them to the sun for 3 days to obtain dry corn stalks. Add 2.2kg of decomposed pig manure, 3.2kg of fresh pig manure and 7.2kg of dry corn stalks in sequence to a biogas tank with 8L of deionized water, stir and mix with a wooden stick for 3 minutes, then add phosphoric acid with a mass concentration of 12% dropwise to adjust the pH to 6.5 , airtight and anaerobic fermentation for 45 days; then collect the mixed gas produced by fermentation, and pass the mixed gas successively through a mass concentration of 30% sodium hydroxide solution and anhydrous calcium chloride to obtain purified and dry fermentation gas; then in a closed reaction kettle, Add 10g of boron oxide and 8g of sulfur powder in turn, start the agitator, set the speed to 640r / min, then feed the above-mentioned p...

example 2

[0018] Firstly, 3kg of fresh pig manure was weighed, stacked and retting at room temperature for 55 days to obtain decomposed pig manure, and then 9kg of corn stalks were weighed, spread evenly under the sunlight, and exposed to the sun for 4 days to obtain dry corn stalks, which were stored in a container. Add 2.5kg of decomposed pig manure, 3.4kg of fresh pig manure and 7.5kg of dry corn stalks in sequence to a biogas tank with 9L of deionized water. After mixing with a wooden stick for 4 minutes, add phosphoric acid with a mass concentration of 14% dropwise to adjust the pH to 6.7. , airtight anaerobic fermentation for 48 days; then collect the mixed gas produced by fermentation, pass the mixed gas successively through a mass concentration of 35% sodium hydroxide solution and anhydrous calcium chloride to obtain purified and dry fermentation gas; then in a closed reaction kettle, Add 11g of boron oxide and 10g of sulfur powder in sequence, start the agitator, set the speed t...

example 3

[0021]Firstly, take 4kg of fresh pig manure, stack and retting at room temperature for 60 days to obtain decomposed pig manure, then weigh 10kg of corn stalks, spread it evenly under the sun, and expose it to the sun for 5 days to obtain dry corn stalks. Add 2.8kg of decomposed pig manure, 3.6kg of fresh pig manure and 7.8kg of dry corn stalks in sequence to a biogas tank with 10L of deionized water, stir and mix with a wooden stick for 5 minutes, then add phosphoric acid with a mass concentration of 16% dropwise to adjust the pH to 6.8 , airtight and anaerobic fermentation for 50 days; then collect the mixed gas produced by fermentation, and pass the mixed gas through a mass concentration of 40% sodium hydroxide solution and anhydrous calcium chloride in turn to obtain purified and dry fermentation gas; then in a closed reaction kettle, Add 15g of boron oxide and 12g of sulfur powder in turn, start the agitator, set the speed to 680r / min, then feed the above-mentioned purified...

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Abstract

The invention discloses a method for preparing hollow nano-structure boron carbide, and belongs to the technical field of boron carbide preparation. Fresh pig manure is cured, dried corn straw and the fresh pig manure are added for methane fermenting to obtain mixed gas, a sodium hydroxide solution and anhydrous calcium chloride are added to purify and dry the mixed gas, then boric oxide serves as a raw material and reacts with elemental sulfur and the purified and dried fermented gas at high temperature and high pressure, and nitrogen is introduced to exhaust other gas generated through the reaction; after the material is cooled to room temperature, the material is taken out to be mixed with hydrochloric acid, unreacted boric oxide is taken out and washed to remove hydrochloric acid, and hollow nano-structure boron carbide is prepared through drying and grinding. The method has the advantages that the preparation steps are simple, and particles are not prone to agglomerate in the preparation process; the purity of the obtained product reaches up to 99.9% or above, the impurity content is low, the grain size is small, and oxidation resistance is high.

Description

technical field [0001] The invention relates to a method for preparing boron carbide with a hollow nanostructure, and belongs to the technical field of boron carbide preparation. Background technique [0002] Boron carbide can absorb a large amount of neutrons without forming any radioactive isotopes, so it is an ideal neutron absorber in nuclear power plants, and neutron absorbers mainly control the rate of nuclear fission. Boron carbide is mainly made into controllable rods in nuclear reactors, but sometimes it is made into powder to increase the surface area. Because of its low density, high strength, high temperature stability and good chemical stability. It is used in wear-resistant materials, ceramic reinforcement phases, especially in lightweight armor, reactor neutron absorbers, etc. Due to the shortcomings of boron carbide itself, such as low fracture toughness, high sintering temperature, poor oxidation resistance, and poor stability to metals, its further applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01P2004/64C01P2006/80
Inventor 郭舒洋盛海丰许博伟
Owner 郭舒洋
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