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Aluminum powder surface self-activation method

A self-activation, aluminum powder technology, applied in the field of aluminum powder surface self-activation and aluminum powder surface treatment, can solve the problems of incomplete combustion of aluminum powder, long delay time, slow energy release, etc., to reduce ignition temperature and improve energy density. , the effect of improving stability

Inactive Publication Date: 2019-02-01
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, through fluorine and Al 2 o 3 The reaction at a lower temperature eliminates the oxide layer on the surface of the aluminum powder, so that the aluminum core is completely exposed to the oxidant, so that a complete reaction occurs, which can solve the problems of incomplete combustion of aluminum powder, high ignition temperature, long delay time, and slow energy release.

Method used

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  • Aluminum powder surface self-activation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 0.2g of C 13 f 25 COOH was dissolved in 15 mL of ether solvent to form an organic fluorine solution, and 5 grams of micron aluminum powder (average particle size of 50 microns) was added to the cyclohexane solution, and dispersed by ultrasound for 30 min. Add ether solution to the aluminum powder dispersion at a rate of 5mL / min, stir at 30°C for 2h, centrifuge, wash twice with cyclohexane, and dry in a vacuum oven at 50°C for 5h to obtain self-activated aluminum on the surface of organic fluorine pink. The TEM image of the self-activated aluminum powder on the organic fluorine surface prepared in this example is attached. figure 1 shown, from the attached figure 1 It can be seen that the surface of the aluminum powder has been completely covered by organic fluorine.

Embodiment 2

[0030] 0.3g of C 13 f 25 COOH was dissolved in 15 mL of ether solvent to form a solution of organic fluoride, and 5 grams of nano-aluminum powder (average particle size: 20 nm) was added into the cyclohexane solution, and dispersed by ultrasound for 30 min. Add ether solution to the aluminum powder dispersion at a rate of 5mL / min, stir at 30°C for 2h, centrifuge, wash twice with cyclohexane, and dry in a vacuum oven at 50°C for 5h to obtain self-activated aluminum on the surface of organic fluorine pink.

Embodiment 3

[0032] 0.2g of C 7 f 14 COOH was dissolved in 15 mL of acetonitrile solvent to form a solution of organic fluoride, and 5 grams of nano-aluminum powder (average particle size of 50 nm) was added to the absolute ethanol solution, and dispersed by ultrasound for 30 min. Add ether solution into the aluminum powder dispersion at a rate of 5mL / min, stir at 50°C for 2h, centrifuge, wash twice with absolute ethanol to completely evaporate the solvent, move to 50°C for 5h in a vacuum oven to obtain organic fluorine Surface self-activating aluminum powder.

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Abstract

The invention discloses an aluminum powder surface self-activation method. The method includes steps: adding aluminum powder into an anhydrous solvent, mixing, and stirring to disperse uniformly to form aluminum powder dispersion liquid; dissolving organic fluoride into a solvent to form organic fluorine solution, adding the organic fluorine solution into the aluminum powder dispersion liquid by acertain rate, and stirring to volatilize the solvent in which the organic fluoride is dissolved at a certain temperature, so that organic fluoride is slowly separated out by crystallization on the aluminum powder surface to form a compact surface activation layer; centrifugally separating to remove the solvent, washing, and performing vacuum drying at 60 DEG C to obtain organic fluorine surface self-activated aluminum powder. By forming of the organic fluorine self-activation layer on the aluminum powder surface, the aluminum powder ignition temperature can be effectively lowered while ignition delay time is shortened, combustion efficiency of aluminum powder in oxidants is improved while the energy releasing rate is increased, and the organic fluorine surface activation layer is effective in aluminum powder oxidation, so that stability is improved.

Description

technical field [0001] The invention relates to a method for treating the surface of aluminum powder, in particular to a method for self-activating the surface of aluminum powder, and belongs to the technical field of energetic material processing. Background technique [0002] Aluminum powder, as a highly active metal fuel, is widely used in explosives, propellants and pyrotechnics due to its high calorific value and low cost. However, the oxide layer on the surface of aluminum powder reduces the activity of aluminum powder, slows the combustion reaction, and increases the ignition temperature, which limits the energy improvement of energetic materials. Especially for submicron and nanometer aluminum powder, the problem of surface oxide layer has become the primary problem restricting its use. At present, in order to solve the surface oxidation problem of aluminum powder, improve the stability of aluminum powder, reduce its ignition temperature, increase energy density and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B45/32C06B21/00
CPCC06B21/0008C06B45/32
Inventor 王军聂福德徐瑞娟屈延阳
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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