Modified aluminum powder as well as preparation method and application thereof

A technology for modification of aluminum powder, applied in the field of modified aluminum powder and its preparation, which can solve the problems of low coating rate of aluminum powder, poor interface bonding force between coating and aluminum powder, etc.

Active Publication Date: 2022-01-21
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional process of coating and modifying the surface of aluminum powder basically adopts a simple mechanical mixing coating method. The disadvantage of this type of method is that the interface bonding force between the coating and the aluminum powder is poor, resulting in the coating of the aluminum powder. low rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Melting aluminum ingots at 750°C to obtain molten aluminum;

[0034] (2) 15 parts by mass of polyvinylpyrrolidone, 60 parts by mass of trifluoroethyl methacrylate and 35 parts by mass of ethanol are uniformly mixed to obtain a mixed solution;

[0035] (3) Heat the molten aluminum to 850°C, spray it with a nitrogen flow of 15MPa to obtain a directional atomized aluminum powder beam; at the same time, use a nitrogen flow of 8MPa to spray the mixed liquid to obtain a directional mixed liquid jet; set the atomization The injection angle between the aluminum powder beam and the mixed liquid jet is 40°, so that the atomized aluminum powder beam and the mixed liquid jet are in contact at the impact area, and the temperature of the impact area is controlled at 650°C to obtain a composite aluminum powder with a microporous structure on the surface;

[0036] (4) the polytetrafluoroethylene that will be made up of the polytetrafluoroethylene of 15% mass content, the copper oxi...

Embodiment 2

[0038] (1) Melting aluminum ingots at 780°C to obtain molten aluminum;

[0039] (2) 15 parts by mass of polyvinylpyrrolidone, 40 parts by mass of hexafluorobutyl acrylate and 45 parts by mass of ethanol are uniformly mixed to obtain a mixed solution;

[0040] (3) Heat the molten aluminum to 800°C, spray it with a nitrogen flow of 10MPa to obtain a directional atomized aluminum powder beam; at the same time, use a nitrogen flow of 5MPa to spray the mixed liquid to obtain a directional mixed liquid jet; set the atomization The injection angle between the aluminum powder beam and the mixed liquid jet is 20°, so that the atomized aluminum powder beam and the mixed liquid jet are in contact at the impact area, and the temperature of the impact area is controlled at 480°C to obtain a composite aluminum powder with a microporous structure on the surface;

[0041] (4) the polytetrafluoroethylene that will be made up of the polytetrafluoroethylene of 15% mass content, the copper oxide ...

Embodiment 3

[0043] (1) Melting aluminum ingots at 760°C to obtain molten aluminum;

[0044] (2) 15 parts by mass of polyvinylpyrrolidone, 60 parts by mass of pentafluoropropyl acrylate and 45 parts by mass of ethanol are uniformly mixed to obtain a mixed solution;

[0045] (3) Heat the molten aluminum liquid to 820°C, spray it with a nitrogen flow of 12MPa to obtain a directional atomized aluminum powder beam; at the same time, use a nitrogen flow of 8MPa to spray the mixed liquid to obtain a directional mixed liquid jet; set the atomization The injection angle between the aluminum powder beam and the mixed liquid jet is 30°, so that the atomized aluminum powder beam and the mixed liquid jet are in contact at the impact area, and the temperature of the impact area is controlled at 600°C to obtain a composite aluminum powder with a microporous structure on the surface;

[0046] (4) the polytetrafluoroethylene that will be made up of the polytetrafluoroethylene of 10% mass content, the copp...

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Abstract

The invention relates to modified aluminum powder as well as a preparation method and application thereof. The modified aluminum powder is obtained through bidirectional airflow mixing to obtain composite aluminum powder with a microporous structure on the surface, and then the composite aluminum powder is coated with a polytetrafluoroethylene-copper oxide-thinned graphite flake ternary composite material. According to the modified aluminum powder as well as the preparation method and application thereof, when the modified aluminum powder is used as an energetic material, the problems that traditional aluminum powder is low in enthalpy value and long in specific impulse signal can be solved, the coating rate of the aluminum powder is high, interface bonding is firm, the particle dispersity is good, the enthalpy value of a product is high, the performance is excellent, and the modified aluminum powder can be used in chemical power enterprises, civil blasting and other industries with the high enthalpy value requirement and the short specific impulse signal requirement.

Description

technical field [0001] The invention relates to the technical field of metal powder treatment, in particular to modified aluminum powder and a preparation method thereof. Background technique [0002] Aluminum powder has excellent properties such as high activity, low melting point and good gloss, and is often used in military industries such as solid propellants. However, the surface of aluminum powder is easily oxidized, and it is also prone to chemical reaction and deterioration in corrosive media, resulting in attenuation or loss of its excellent performance. Therefore, coating and modifying the surface of aluminum powder to improve its hydration resistance and oxidation resistance is the key to its successful application in energetic materials. The traditional process of coating and modifying the surface of aluminum powder basically adopts a simple mechanical mixing coating method. The disadvantage of this type of method is that the interface bonding force between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/102B22F1/16B22F1/05C06B45/32C06B33/00C06B21/00C06B23/00
CPCB22F9/082C06B45/32C06B33/00C06B21/0083C06B23/009B22F2009/0864
Inventor 刘春轩高平平曹柳絮张扬罗任戴青松吴云谢屹
Owner CENT SOUTH UNIV
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