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Nanometer bismuth oxide-coated modified boron fuel and preparation methods thereof

A nano-bismuth oxide and modification technology, which is applied in the direction of explosives, can solve the problems of refractory melting and gasification, low combustion efficiency of boron, high melting point and boiling point, and achieve stable combustion state, high combustion efficiency and good fuel performance.

Inactive Publication Date: 2013-11-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1. Elemental boron has high melting point and boiling point, so it is difficult to melt and gasify, B 2 o 3 The boiling point of boron is also relatively high (the melting point is 460°C, and the boiling point is 1860°C), so it takes a very high temperature to make the boron particles ignite and burn, and the combustion process has to go through B 2 o 3 Evaporation of the oxide layer, which makes it more difficult for boron particles to sustain combustion;
[0009] 2. Boron has low combustion efficiency, high oxygen consumption, and produces a lot of residues, which cannot give full play to its high energy calorific value;
[0010] 3. B exists on the surface of boron 2 o 3 、H 3 BO 3 Impurities such as boron are incompatible with propellant and explosive systems
[0011] Therefore, the problem in the prior art is: how to improve the ignition performance, combustion performance and surface characteristics of boron fuel, so that the high-energy calorific value of boron fuel can be fully utilized, so that boron-containing pyrotechnics can be more widely used

Method used

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  • Nanometer bismuth oxide-coated modified boron fuel and preparation methods thereof

Examples

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Embodiment 1

[0053] Example 1 Modified boron fuel prepared by precipitation method

[0054] Taking the target product mass of 1.553g (the mass ratio of boron to bismuth oxide is 40:60) as an example, the amount of various raw materials required is: bismuth nitrate pentahydrate 1.94g, sodium hydroxide 0.68g, ultrafine boron powder 0.621 g (the average particle size is 4.9 μm), ethanol 200ml. Accurately weigh quantitative bismuth nitrate pentahydrate and sodium hydroxide, and dissolve them in ethanol respectively; under normal temperature and stirring conditions, add ultrafine boron powder to the bismuth nitrate solution, and fully stir to make it evenly dispersed in the solution; Add sodium hydroxide solution dropwise to the mixed suspension to make it fully react, filter the product, wash with deionized water and ethanol three times respectively, vacuum dry at 60°C for 2h, and calcinate at 400°C for 2h, the obtained product is The nano-bismuth oxide-coated modified boron fuel of this pate...

Embodiment 2

[0056] Example 2 Modified boron fuel prepared by precipitation method

[0057] Taking the target product mass of 1.864g (the mass ratio of boron to bismuth oxide is 50:50) as an example, the amount of various raw materials required is: bismuth nitrate pentahydrate 1.94g, sodium hydroxide 0.68g, ultrafine boron powder 0.932 g (average particle size is 5.07μm), ethanol 200ml. Accurately weigh quantitative bismuth nitrate pentahydrate and sodium hydroxide, and dissolve them in ethanol respectively; under normal temperature and stirring conditions, add ultrafine boron powder to the bismuth nitrate solution, and fully stir to make it evenly dispersed in the solution; Add sodium hydroxide solution dropwise to the mixed suspension to make it fully react, filter the product, wash with deionized water and ethanol three times respectively, vacuum dry at 60°C for 2h, and calcinate at 400°C for 2h, the obtained product is The nano-bismuth oxide-coated modified boron fuel of this patent; ...

Embodiment 3

[0059] Example 3 Modified boron fuel prepared by precipitation method

[0060] Taking the target product mass of 2.332g (the mass ratio of boron to bismuth oxide is 60:40) as an example, the amount of various raw materials required is: 1.94g of bismuth nitrate pentahydrate, 0.68g of sodium hydroxide, and 1.4g of superfine boron powder g (average particle size is 5.3μm), ethanol 200ml. Accurately weigh quantitative bismuth nitrate pentahydrate and sodium hydroxide, and dissolve them in ethanol respectively; under normal temperature and stirring conditions, add ultrafine boron powder to the bismuth nitrate solution, and fully stir to make it evenly dispersed in the solution; Add sodium hydroxide solution dropwise to the mixed suspension to make it fully react, filter the product, wash with deionized water and ethanol three times respectively, vacuum dry at 60°C for 2h, and calcinate at 400°C for 2h, the obtained product is The nano-bismuth oxide-coated modified boron fuel of th...

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Abstract

The invention discloses a nanometer bismuth oxide-coated modified boron fuel and two kinds of preparation methods thereof. The modified boron fuel comprises the components, in percentage by mass: 30-60 of superfine boron powder, and 70-40 of nanometer bismuth oxide. The first preparation method comprises the steps of metering raw materials, preparing a raw material solution, adding the boron powder, preparing a precursor and calcinating; and the second preparation method comprises the steps of metering raw materials, preparing the precursor and calcinating. The nanometer bismuth oxide-coated modified boron fuel has low ignition temperature, releases a large amount of heat, has high combustion efficiency, and has a stable combustion state when be added in an explosive formula.

Description

technical field [0001] The invention belongs to the technical field of high-energy fuels used in propellant and explosives, in particular to a modified nano-bismuth oxide coating with large heat release and high combustion efficiency added to the formula of boron-based ignition powder and boron-based delay powder with stable combustion state Boron fuel and method for its preparation. Background technique [0002] Among various fuels that can be used in the field of explosives, boron has many advantages such as high mass calorific value, high volumetric calorific value, non-toxic raw materials, non-toxic combustion products, and abundant sources, and has become a research hotspot in the field of explosives. The application of boron powder in the field of explosives mainly includes boron-based ignition powder and boron-based delay powder. As a high-energy ignition powder, boron-based ignition powder has a large heat of combustion and strong ignition ability, and has always be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B27/00
Inventor 魏永奇刘松刘厅陈昕韩爱军叶明泉潘功配
Owner NANJING UNIV OF SCI & TECH
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