Method for coating micro/nano-metal powder by chemical vapor deposition

A chemical vapor deposition, micro-nano technology, applied in gaseous chemical plating, metal material coating process, coating and other directions, can solve the problems of difficult industrial production, complex operation process, generation of waste liquid, etc., to improve the reaction rate and heat release, high hydrophobicity, the effect of lowering the ignition temperature

Active Publication Date: 2012-07-18
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

R.J.Jouet uses C13F27COOH to coat nano-aluminum powder. Although the aluminum powder is coated with energy, the process is carried out in a solution, the operation process is complicated, and waste liquid is generated. Industrial production is difficult.

Method used

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  • Method for coating micro/nano-metal powder by chemical vapor deposition
  • Method for coating micro/nano-metal powder by chemical vapor deposition
  • Method for coating micro/nano-metal powder by chemical vapor deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1), as attached figure 1 As shown, first, the cracking tube 4 is preheated, the temperature is raised to 300° C., and the temperature is kept constant for 25 minutes, and the temperature is realized by the temperature control system 10;

[0040]2), take 2g of aluminum powder with a particle size of 5 microns and add it to the reaction chamber 5, adjust the distance between the lower port of the cracking tube 4 and the aluminum powder to 1.5-2cm, use the vacuum pump 9 to evacuate the reaction chamber 5, and connect Cooling water 7 at 20°C is circulated for cooling;

[0041] 3), open the on-off valve of hexafluoropropylene oxide (HFPO) gas tank 1, regulate flow to 30sccm by pressure reducing valve 2 and flow meter 3, enter cracking tube 4, the difluorine that HFPO decomposes in cracking tube 4 produces Carbene (CF2) free radical.

[0042] 4) Difluorocarbene (CF2) free radicals produced by decomposition are polymerized on the surface of the aluminum powder to form a poly...

Embodiment 2

[0045] 1), first, preheat the cracking tube 4, the temperature reaches 350° C., and keeps the temperature constant for 25 minutes, and the temperature is realized by the temperature control system 10;

[0046] 2), take 2g of aluminum powder with a particle size of 1 micron and add it to the reaction chamber 5, adjust the distance between the 4 lower ports of the cracking tube and the aluminum powder between 1.5-2cm, and use the vacuum pump 9 to evacuate the reaction chamber 5 to make the reaction chamber 5 is in a vacuum state, and the cooling water 7 at 20°C is connected for circulating cooling;

[0047] Subsequent steps are the same as in Example 1.

Embodiment 3

[0049] 1), first, preheat the cracking tube 4, the temperature reaches 400°C, and keeps the temperature constant for 20 minutes, and the temperature is realized by the temperature control system 10;

[0050] 2), take 2g of boron powder with a particle size of 1 micron and add it to the reaction chamber 5, adjust the distance between the 4 openings of the cracking tube and the boron powder between 1.5-2cm, and use the vacuum pump 9 to evacuate the reaction chamber 5 to make the reaction chamber 5 In a vacuum state, turn on cooling water 7 at 20°C for circulating cooling, such as figure 1 shown.

[0051] Subsequent steps are the same as in Example 1.

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Abstract

The invention discloses a method for coating micro/nano-metal powder by chemical vapor deposition, including: decomposing difluorocarbene precursor gas via a cracking pipe to generate difluorocarbene free radicals; contacting the generated difluorocarbene free radicals with micro/nano-metal powder, and due to polymerization between difluorocarbene free radicals, a compact polytetrafluoroethylene coating film is generated on the surface of micro/nano-metal powder. In allusion to disadvantages and defects of the application of micro/nano-metal powder in energy-containing materials, polytetrafluoroethylene is polymerized on the surface of metal powder by chemical vapor deposition in order to coat micro/nano-metal powder. In the invention, the ignition temperature of metal powder is effectively decreased, the ignition delay time is shortened, and the combustion speed of metal powder is improved; the surface of metal powder coated with polytetrafluoroethylene is highly hydrophobic, so that reactive metal powder can be effectively prevented from absorption of moisture and oxidation.

Description

technical field [0001] The embodiment of the present invention relates to a method for coating the surface of metal powder, in particular to a method for coating micro-nano metal powder by chemical vapor deposition, which belongs to the technical field of preparation of energetic materials. Background technique [0002] Micro-nano metal powders, especially aluminum powder, boron powder, nickel powder, etc., are widely used as high-energy additives in energetic materials. However, due to its active chemical properties, large specific surface area and surface energy, micro-nano metal powder is very easy to oxidize and agglomerate during use and storage. Usually, a dense oxide coating film is formed on its surface. Due to the inertness of the oxide layer, the oxide layer on the surface of the metal powder needs to be evaporated and melted at high temperature during the ignition and combustion process. For example, the alumina formed on the surface of the aluminum powder needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C16/00
Inventor 王军杨光成谯志强黄辉
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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