Preparation method of nano-aluminum powder coated with mesoporous titanium dioxide

A technology of mesoporous titanium dioxide and nano-aluminum powder, which is applied in offensive equipment, explosives processing equipment, explosives, etc., can solve problems such as unsuitable for industrial production, complex process, and small output, and achieve rapid combustion reaction, simple reaction, and The effect of low equipment requirements

Active Publication Date: 2021-06-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sol-gel method is used for preparation, the process is complicated, and the output is small and the efficiency is low, so it is not suitable for industrial production and application.

Method used

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  • Preparation method of nano-aluminum powder coated with mesoporous titanium dioxide
  • Preparation method of nano-aluminum powder coated with mesoporous titanium dioxide
  • Preparation method of nano-aluminum powder coated with mesoporous titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 1.5g of triblock copolymer Pluronic F127, 2.4mL of acetic acid, and 3.2mL of concentrated hydrochloric acid in 30mL of tetrahydrofuran in sequence, and then add 3.0mL of butyl orthotitanate dropwise under stirring conditions. Place it in a blast oven at 45°C to dry, so that the solvent is completely evaporated, and the solidified mesoporous TiO is obtained. 2 Precursor gel.

[0028] Weigh 3.0g of the precursor gel and add it to 15mL of absolute ethanol and stir evenly, then add 3mL of glycerol dropwise, disperse 0.1g of nano-aluminum powder in the solution, stir and react in an oil bath at 100°C for 6h, and collect the product by centrifugation after cooling , washed, vacuum dried, and finally annealed for 3h under vacuum or inert gas conditions to obtain mesoporous TiO 2 Coated with nano-aluminum powder.

[0029] image 3 and Figure 5 These are the SEM and TEM photos of the metal oxide-coated nano-aluminum powder prepared in this example, respectively. It...

Embodiment 2

[0031] Dissolve 1.5g of triblock copolymer Pluronic F127 and 5mL of concentrated hydrochloric acid in 30mL of isopropanol in sequence, then add 3.0mL of butyl orthotitanate drop by drop under stirring condition, after stirring evenly, place it in 45 ℃ drying in a blast oven to completely volatilize the solvent to obtain solidified mesoporous TiO 2 Precursor gel.

[0032] Weigh 3.0g of the precursor gel and add it to 15mL of absolute ethanol and stir evenly, then add 8mL of glycerol dropwise, disperse 0.1g of nano-aluminum powder in the solution, stir and react in an oil bath at 100°C for 4h, and collect the product by centrifugation after cooling , washed, vacuum dried, and finally annealed for 3h under vacuum or inert gas conditions to obtain mesoporous TiO 2 Coated with nano-aluminum powder.

Embodiment 3

[0034] Dissolve 2.0g of triblock copolymer Pluronic F127 and 6.4mL of glacial acetic acid in 30mL of tetrahydrofuran in sequence, then add 4.0mL of ethyl orthotitanate dropwise under stirring conditions, stir well, and place it at 45°C Dry in a blast oven to completely volatilize the solvent to obtain solidified mesoporous TiO 2 Precursor gel.

[0035] Weigh 2.0g of the precursor gel and add it to 10mL of absolute ethanol and stir evenly, then drop 5mL of glycerol to disperse 0.3g of nano-aluminum powder in the solution, stir and react in an oil bath at 100°C for 18h, and collect the product by centrifugation after cooling. Washing, vacuum drying, and finally annealing for 3h under vacuum or inert gas conditions to obtain mesoporous TiO 2 Coated with nano-aluminum powder.

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Abstract

The invention discloses a preparation method of nanometer aluminum powder coated with mesoporous titanium dioxide. The method first dissolves Pluronic F127 and an acidic catalyst in an organic solvent, and adds a titanium source dropwise to obtain solidified mesoporous TiO 2 Precursor gel, then disperse the precursor gel in ethanol, drop glycerin, add nano-aluminum powder, react in oil bath, and anneal to obtain mesoporous TiO 2 Coated with nano-aluminum powder. The invention has mild conditions, simple reaction process and low preparation cost, and is suitable for industrial production and batch preparation. Mesoporous TiO prepared by the present invention 2 Coated nano-aluminum powder, mesoporous TiO coated on the surface of nano-aluminum powder 2 It can effectively prevent the oxidation of aluminum powder and maintain the activity of aluminum powder; the shell can promote the vaporization of the inner core of aluminum powder, the pressure rises, and finally the shell cracks, strengthening the combustion of aluminum powder. Mesoporous TiO prepared by the present invention 2 When the coated nano-aluminum powder is added to the solid propellant for high-temperature combustion, the surface-coated TiO 2 It has obvious catalytic effect on the combustion of solid propellant, which is beneficial to improve the combustion performance of solid propellant.

Description

technical field [0001] The technical field of preparation of energetic materials of the present invention relates to a preparation method of mesoporous titania-coated nano-aluminum powder. Background technique [0002] Metallic aluminum powder is a common metal additive in solid rocket propellants. Adding aluminum powder can not only increase the energy of the propellant, but also effectively suppress the instability of the rocket engine (Zhang Wei, Cao Taiyue. Computational Research on the Combustion of Aluminum Powder Particles and the Condensation and Nucleation of Combustion Products[J]. Solid Rocket Technology, 1997, 20 (2):43-47.). Aluminum powder usually used in explosives and propellants has a diameter of about 30 μm. However, it has been found in practical applications that the use of ordinary aluminum powder and micron aluminum powder will agglomerate before ignition, causing aggregation, agglomeration or agglomeration, which will lead to incomplete combustion of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B21/00C06B23/00
CPCC06B21/0091C06B23/00C06B23/007C06B23/009
Inventor 张文超陈亚杰郑子龙吴刚刚胡斌叶家海
Owner NANJING UNIV OF SCI & TECH
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