Method for achieving aluminum powder passivation by wrapping aluminum powder with zirconium oxide

A technology of zirconia and aluminum coating, which is applied in the direction of gaseous chemical plating, metal material coating process, coating, etc., can solve the problems of affecting performance and deterioration of nano-aluminum powder, and achieves convenient operation and good passivation effect , The effect of simple process

Active Publication Date: 2017-03-15
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although nano-aluminum powder has the above-mentioned various advantages and characteristics, it is very easy to react with oxygen molecules and water molecules in the air, resulting in the deterioration of nano-aluminum powder, thus affecting its performance

Method used

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  • Method for achieving aluminum powder passivation by wrapping aluminum powder with zirconium oxide
  • Method for achieving aluminum powder passivation by wrapping aluminum powder with zirconium oxide
  • Method for achieving aluminum powder passivation by wrapping aluminum powder with zirconium oxide

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Effect test

Embodiment 1

[0054] In this embodiment, atomic layer deposition technology is used to coat zirconia with a thickness of 100 cycles (about 10 nm) on the surface of nano-aluminum powder to passivate the aluminum powder. The method includes the following steps:

[0055] (1) Weigh 0.2 grams of nano-aluminum powder with an electronic balance, put it into a holder with a filter screen at the bottom, then put the powder holder into the cavity of the atomic layer deposition reactor, and cover the cavity , turn on the switch of the vacuum pump to vacuumize, and the outlet pressure of the cavity is 1Pa.

[0056] (2) Heating the chamber, the temperature of the reaction chamber is set at 150°C. During the heating process, nitrogen gas is continuously fed in at a flow rate of 100 standard milliliters per minute as the fluidization gas to pre-disperse the aluminum powder, and the outlet of the chamber is The pressure is 40Pa;

[0057] (3) When the temperature of the chamber is stable at 150°C, the atom...

Embodiment 2

[0065] In this embodiment, atomic layer deposition technology is used to coat zirconia with a thickness of 10 cycles (about 1 nm) on the surface of nano-aluminum powder, and the aluminum powder is passivated. The method includes the following steps:

[0066] (1) Weigh 0.05 grams of nano-aluminum powder with an electronic balance, put it into a holder with a filter screen at the bottom, then put the powder holder into the cavity of the atomic layer deposition reactor, and cover the cavity , turn on the switch of the vacuum pump to vacuumize, and the outlet pressure of the cavity is 0.5Pa.

[0067] (2) Heating the chamber, the temperature of the reaction chamber is set at 120°C. During the heating process, nitrogen gas is continuously fed in at a flow rate of 50 standard milliliters per minute as the fluidization gas to pre-disperse the aluminum powder, and the outlet of the chamber is The pressure is 200Pa;

[0068] (3) When the temperature of the chamber is stable at 120°C, t...

Embodiment 3

[0076] In this embodiment, atomic layer deposition technology is used to coat the surface of nano-aluminum powder with zirconia with a thickness of 1000 cycles (about 100nm) to passivate the aluminum powder. The method includes the following steps:

[0077] (1) Weigh 5 grams of nano-aluminum powder with an electronic balance, put it into a holder with a filter screen at the bottom, then put the powder holder into the cavity of the atomic layer deposition reactor, and cover the cavity , turn on the switch of the vacuum pump to vacuumize, and the outlet pressure of the cavity is 0.8Pa.

[0078] (2) Heating the chamber, the temperature of the reaction chamber is set to 180°C. During the heating process, nitrogen gas is continuously fed in at a flow rate of 500 standard milliliters per minute as the fluidization gas to pre-disperse the aluminum powder, and the outlet of the chamber is The pressure is 500Pa;

[0079] (3) When the temperature of the chamber is stable at 180°C, the ...

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Abstract

The invention discloses a method for achieving aluminum powder passivation by wrapping aluminum powder with zirconium oxide. The method comprises the following steps that firstly, the aluminum powder needing to be wrapped is placed in a powder clamping device with the bottom provided with a filter net, and then the powder clamping device is placed in a cavity of an atom layer deposition reactor to be subjected to vacuum pumping; secondly, the cavity is heated, the cavity is constantly inflated with fluidization gas in the heating process, and the aluminum powder is pre-scattered; thirdly, when the cavity temperature reaches the preset temperature, the atom layer deposition reaction is started, and a layer of zirconium oxide film is deposited on the surface of the aluminum powder; and fourthly, the third step is repeatedly conducted, multiple layers of zirconium oxide films are deposited on the surface of the aluminum powder, and aluminum powder passivation is achieved. According to the method, the atom deposition technology is used for wrapping the surfaces of aluminum powder particles with a layer of zirconium oxide film with the nanometer thickness, aluminum powder passivation is achieved, and the beneficial effects that operation is convenient, and the technology is simple are achieved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and more specifically relates to a method for passivating aluminum powder coated with zirconia. Background technique [0002] Nano-aluminum powder is a spherical powder with an average particle size of 50nm. It has a large specific surface area and can provide greater combustion enthalpy than ordinary aluminum powder. It can be used as a high-efficiency catalyst, activated sintering additive, and conductive coating on the surface of metals and scrap metals. Treatment agents, conductive film layers, high-grade metal pigments, composite materials, etc., are widely used in aerospace, chemical industry, metallurgy, shipbuilding and other fields, especially in solid rocket propellants and military explosives, which have broad application prospects. [0003] Although nano-aluminum powder has the above-mentioned various advantages and characteristics, it is very easy to react with oxygen molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/40C23C16/455
CPCC23C16/405C23C16/45525
Inventor 陈蓉曲锴单斌竹鹏辉段晨龙赵凯
Owner HUAZHONG UNIV OF SCI & TECH
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