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Coating method of nano-aluminum powder

A nano-aluminum powder and coating technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of easy oxidation and deactivation of nano-aluminum powder, decrease of active aluminum content, preparation and storage difficulties and other problems, to achieve the effect of convenient operation, guaranteed metal activity, and simple process flow

Inactive Publication Date: 2017-07-28
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, nano-aluminum powder has high surface activity, and it is more difficult to prepare and store than micron-aluminum powder.
Nano-aluminum powder is very easy to oxidize and deactivate in practical applications. If the surface is covered with a 2-6nm alumina thin layer, the active aluminum content will drop significantly with the decrease of particle size. Currently, the surface coating method is commonly used to solve its oxidation deactivation. live question

Method used

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  • Coating method of nano-aluminum powder
  • Coating method of nano-aluminum powder
  • Coating method of nano-aluminum powder

Examples

Experimental program
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preparation example Construction

[0018] 1. Preparation of precursors. Disperse 4.6mmol of anhydrous AlCl3 into 60mL of toluene solution, weigh 4.0g of N(Et)3 (39mmol), and add it dropwise to the above solution. After the solid AlCl3 in the reaction bottle completely disappears, slowly add a certain amount of A large amount of LiAl H4 was reacted for 16 hours, then centrifuged, and the supernatant was the precursor Al H3 N(Et)3 solution, and the LiCl in the precursor was extracted and removed with an appropriate amount of ice methanol (0°C). The reaction equation is as follows:

[0019] AlCl 3 +N(Et) 3 →AlCl 3 ·N(Et) 3 ,

[0020] AlCl 3 ·N(Et) 3 +3N(Et) 3 +3LiAlH 4 →4AlH 3 ·N(Et) 3 +3LiCl↓

[0021] 2. Catalytic decomposition of precursors to prepare nano-aluminum powder. Pour 60mL of the precursor into a three-necked flask, connect the double-row pipes, vacuumize the system, and circulate argon for 3 times, then heat the solution to a certain temperature, add an appropriate amount of catalyst Ti(O...

Embodiment 1

[0027] Mix 100g of absolute ethanol and 100g of ether to prepare 200g of alcohol ether solution.

[0028] Pour the prepared alcohol ether solution into a stirrer, pour 200g of nano-scale aluminum powder into the stirrer, and stir at room temperature for 1 hour.

[0029] Take out the mixture of aluminum powder and alcohol ether solution that has been stirred, place it on a tray and spread it out.

[0030] Put the spread mixture into a vacuum drying oven, set the drying temperature to 35° C., and dry for 2 hours, then vacuumize to a vacuum degree of -0.07 Mpa, and start the drying oven. Prepare coated nano-aluminum powder, the quality is 202g.

Embodiment 2

[0032] Mix 500g of absolute ethanol and 500g of ether to prepare 1kg of alcohol ether solution.

[0033] Pour the prepared alcohol ether solution into a stirrer, take 1 kg of nano-scale aluminum powder into the stirrer, and stir at room temperature for 2 hours.

[0034] Take out the mixture of aluminum powder and alcohol ether solution that has been stirred in the second step, place it on a tray and spread it out.

[0035] Put the spread mixture into a vacuum drying oven, set the drying temperature to 40° C., and set the drying time to 3 hours. Then, vacuumize to a vacuum degree of -0.07 Mpa, and start the drying oven. Prepare coated nano-aluminum powder with a mass of 1.01 kg.

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Abstract

The invention relates to the technical field of metal powder surface treatment and particularly to a coating method of nano-aluminum powder. The coating method of nano-aluminum powder comprises the following steps: preparing nano-aluminum powder compound ions and an alcohol ether solution; preparing nano-aluminum powder microcapsules by a series of chemical reactions of the obtained nano-aluminum powder compound ions and the alcohol ether solution; spreading the nano-aluminum powder microcapsules, and performing drying treatment on the nano-aluminum powder microcapsules in a vacuum drying oven, so as to obtain a composite material having a core-shell structure. According to the coating method of nano-aluminum powder, the technological process is simple and convenient to implement, large-batch coating can be completed at a time, nano-aluminum powder with a better coating performance can be directly prepared, the activity of the coated nano-aluminum powder is higher, the metal activity of the nano-aluminum powder is effectively ensured, and the problem of oxidation deactivation of the nano-aluminum powder is solved.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nanometer materials and surface treatment of metal powders, and in particular relates to a nanometer aluminum powder coating method. Background technique [0002] In metal fuel, aluminum powder has a low melting point, moderate metal activity, good storage stability, low oxygen consumption, high density, rich raw materials, low cost, and high reaction rate make low-size aluminum powder in the engine A large amount of heat can be generated during the working process, and it is an ideal metal fuel, so it is often used to prepare metal fuels. [0003] However, nano-aluminum powder has high surface activity, and it is more difficult to prepare and store than micron-aluminum powder. Nano-aluminum powder is very easy to oxidize and deactivate in practical applications. If the surface is covered with a thin layer of 2-6nm alumina, the content of active aluminum will decrease signi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/30B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/30B22F1/07B22F1/102B22F1/054
Inventor 刘平安许一楠常浩王文超刘俊鹏吕方伟丁涛
Owner HARBIN ENG UNIV
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