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A device and method for online reversible coating of nanometer metal powder

A nano-metal powder and coating technology, which is applied in the field of online reversible coating devices, can solve the problems of no relevant reports, limit the use of metal nano-powder, and it is difficult to avoid oxidation, so as to achieve convenient use and storage, and convenient and effective removal , to avoid the effect of surface oxidation

Inactive Publication Date: 2017-11-14
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing coating technology can play a certain role of surface coating and anti-oxidation protection on the nano-metal powder, there are still two common problems in the process of use. One is to coat the nano-metal powder after preparation, As a result, it is difficult to avoid oxidation during the transfer process before the nano-metal powder is coated; the second is that a permanent coating layer is formed on the surface of the nano-metal powder, and the clean surface of the nano-metal powder cannot be restored during later use. Therefore, the excellent surface properties of nano-metal powders cannot be exerted
Chinese invention patent ZL200510021797.4 discloses a preparation method and device for organically coated metal nanopowder, which can coat a layer of hydrocarbon layer with a thickness of several nanometers on the surface of metal nanopowder, effectively preventing the oxidation of metal nanopowder , but the hydrocarbon layer formed by high-pressure plasma has a dense structure and is insoluble in any organic solvent, so the hydrocarbon layer coated on the surface cannot be effectively removed in the later use process, which limits the further application of metal nanopowder in some fields. use
On-line organic coating of nanometer metal powder, and the surface coating technology that the coating layer can be completely removed during later use has not yet been reported.

Method used

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  • A device and method for online reversible coating of nanometer metal powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 It is a schematic structural diagram of the device for online reversible coating of nanometer metal powder of the present invention.

[0027] Table 1 shows the specific process parameters of the online reversible coating of nanometer metal powder in the embodiment of the present invention.

[0028] The nanometer metal powder in this embodiment is copper powder with a particle diameter of 80 nm.

[0029] The metal nano powder preparation device of the Laser Fusion Research Center of the Chinese Academy of Engineering Physics was used to prepare an inert gas flow containing nano metal powder online17.

[0030] Set the flow rate to about 0.8m 3 The inert gas flow 17 that contains the nano metal powder of / h is connected in the thermal polymerization reaction tube 1, utilizes the ring heater 2 that is surrounded on the thermal polymerization reaction tube 1 top and the heating temperature control assembly 16 to contain the inert gas flow 17 of the nano metal powd...

Embodiment 2

[0034] The specific process parameters specified in Table 1 are as follows. The nano-metal powder in this example is aluminum powder with a particle size of 200nm. Repeat the preparation process of Example 1, but the temperature of the liquid organic monomer 7 is heated to about 80°C. A polystyrene-coated aluminum nanopowder with a thickness of about 3 nm can be obtained.

Embodiment 3

[0036] The specific process parameters specified in Table 1 are as follows. The nano-metal powder in this example is iron powder with a particle size of 50nm. Repeat the preparation process of Example 1, but the temperature of the liquid organic monomer 7 is heated to about 30°C. A polystyrene-coated iron nanopowder with a thickness of about 5 nm can be obtained.

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Abstract

The invention provides a device and method for online reversible coating of nanometer metal powder. The method utilizes supporting devices to flow the inert gas flow containing styrene organic monomer vapor into the inert gas flow containing nano-metal powder at a certain temperature, and the styrene gas molecules collide with the nano-metal powder and are adsorbed on the nano-metal powder. Due to the certain temperature and catalytic polymerization of the nano-metal powder, styrene gas molecules self-polymerize on the surface of the nano-metal powder to form a layer of polystyrene organic coating with a thickness of several nanometers. The device and method of the present invention can prepare polystyrene-coated nano-metal powder, which can avoid the oxidation of nano-metal powder, and in the later use process, the polystyrene coating can be completely dissolved in most organic solvents , to restore the clean surface of nano metal powder.

Description

technical field [0001] The invention belongs to the field of nano-metal material preparation, and in particular relates to an online reversible coating device and method of nano-metal powder. Background technique [0002] Due to the characteristics of surface effect, quantum size effect and macroscopic quantum effect, nano metal powder has different mechanical, thermal, optical, electrical, magnetic and chemical properties from ordinary metal powder materials. It has broad application prospects. However, nano-metal powders have large specific surface area and high surface activity. During the preparation and use, they will be oxidized due to exposure to the atmosphere, which will affect the surface state and characteristics of nano-metal powders, and even cause safety problems such as high temperature or combustion, which seriously hinders the development of nano-metal powders. Practical applications of metal powders. With the further development of nano science and techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B82Y40/00
CPCB82Y40/00B22F1/102
Inventor 罗江山李喜波徐习斌李恺谭秀兰康晓丽张吉强陈龙罗炳池金雷李文琦张建波
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS