Method for improving high-temperature thermal reaction properties of aluminum powder through surface modification

A technology of surface modification and reaction performance, applied in metal processing equipment, transportation and packaging, etc., can solve the problem of low combustion heat, achieve simple production equipment, improve high temperature thermal reaction performance, improve high temperature oxidation rate and heat release rate Effect

Active Publication Date: 2018-10-23
永州市中新再生资源有限公司
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  • Description
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Problems solved by technology

It is not difficult to see from the existing literature that the thermal reaction performance of aluminum powder fuel is improved through surface modification. However, the energetic system is a multi-component system with a strict ratio. Or carbon, the heat of combustion itself is not high, and only a small amount of energy is released during the combustion process, but its components occupy a certain mass share, which is not conducive to improving the overall energy performance of the energetic system

Method used

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  • Method for improving high-temperature thermal reaction properties of aluminum powder through surface modification
  • Method for improving high-temperature thermal reaction properties of aluminum powder through surface modification
  • Method for improving high-temperature thermal reaction properties of aluminum powder through surface modification

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: according to the following steps modified aluminum powder

[0024] (1) Under normal temperature and pressure, 5 kg of aluminum powder was added to 1000 kg of water, and the power was 60 watts for ultrasonic dispersion to obtain an aqueous phase suspension of aluminum powder; the particle size range of the aluminum powder was 100 nanometers;

[0025] (2) Add a certain amount of modifier to the aluminum powder suspension at one time, and the whole process is carried out under stirring at 500 rpm. After reacting for 1 hour, the product is centrifuged and washed, and dried at 45°C to obtain modified aluminum powder; the modifying agent is hydrochloric acid, and the concentration of hydrochloric acid in the aluminum powder suspension is 0.1mol / L.

Embodiment 2

[0026] Embodiment 2: according to the following steps modified aluminum powder

[0027] (1) Under normal temperature and pressure, 12.5 kg of aluminum powder was added to 1000 kg of water, and the power was 210 watts for ultrasonic dispersion to obtain an aqueous phase suspension of aluminum powder; the particle size range of the aluminum powder was 1 micron;

[0028] (2) Add a certain amount of modifier to the aluminum powder suspension at one time, and the whole process is carried out under stirring at 750 rpm. After 0.75 hours of reaction, the product is centrifuged and washed, and dried at 45°C to obtain modified aluminum powder; the modifying agent is sulfuric acid, and the concentration of sulfuric acid in the aluminum powder suspension is 0.2mol / L.

Embodiment 3

[0029] Embodiment 3: modify aluminum powder according to the following steps

[0030] (1) Under normal temperature and pressure, 20 kg of aluminum powder was added to 1000 kg of water, and the power of 360 watts was ultrasonically dispersed to obtain an aqueous phase suspension of aluminum powder; the particle size range of the aluminum powder was 10 microns;

[0031] (2) Add a certain amount of modifier to the aluminum powder suspension at one time, and the whole process is carried out under stirring at 1000 rpm. After 0.5 hours of reaction, the product is centrifuged and washed, and dried at 45°C to obtain modified aluminum powder; the modifying agent is ammonium fluoride, and the concentration of ammonium fluoride in the aluminum powder suspension is 0.3 mol / L.

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Abstract

The invention discloses a method for improving high-temperature thermal reaction properties of aluminum powder through surface modification. According to the method, a modifying agent is added to an aluminum powder aqueous phase suspension solution; the modifying agent belongs to an acid solution or fluoride; an inertia oxidation layer on the surface of aluminum powder is subjected to microcorrosion through the modifying agent, and the modified aluminum powder with the porous rough surface is formed. The high-temperature oxidation rate and heat release rate of the aluminum powder are increasedthrough the modified aluminum powder, and then the high-temperature oxidation combustion performance of the aluminum powder is improved.

Description

technical field [0001] The invention relates to a material modification method, in particular to a method for improving the high-temperature thermal reaction performance of aluminum powder through surface modification. Background technique [0002] Due to its high density, low oxygen consumption and high heat of combustion, aluminum powder has a significant effect on increasing specific impulse, coupled with abundant raw materials and low cost, so it is widely used as metal fuel in propellants, explosives, The field of energetic materials such as thermite. Usually, the surface of aluminum powder is covered by a layer of smooth and dense aluminum oxide film, and the oxidation film on the surface of aluminum powder needs to be broken and evaporated when it is ignited and burned. How to improve the oxidation combustion efficiency of aluminum powder has become an important problem to be solved in the actual use of aluminum powder. Gong Feiyan et al. (CN103772078A) disclose a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCB22F1/145
Inventor 程志鹏于森博居成佳褚效中张莉莉徐继明仲慧
Owner 永州市中新再生资源有限公司
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