Composite aluminum powder, and preparation method, spraying method and use thereof

Abstract

The invention relates to a composite aluminum powder, and a preparation method, a spraying method and a use thereof. The composite aluminum powder can be sprayed on the surface of metal and plastic, the oxygen content of a coating layer formed on the surface of the substrate after the spraying is not more than 0.05%,and the coating layer is free from O, and can pass adhesion test and 48 h salt spray test.

Description

technical field [0001] The invention relates to the field of spraying materials, in particular to a composite aluminum powder and its preparation method, spraying method and application. Background technique [0002] Thermal spraying technology is a kind of heat source that uses gas, liquid fuel or electric arc, plasma arc, laser, etc. to powder or filament metal, alloy, ceramic, oxide, carbide, plastic, nylon and their composite materials, Heating to a molten or semi-molten state, through the power of the heat source itself, or an external high-speed airflow to atomize it, and spray it on the surface of the pretreated workpiece at a certain speed to form a firmly adhered surface layer. [0003] Cold spraying is an innovative spraying technology that does not melt or gasify the powder material, but maintains the original solid phase state with supersonic flow to make it impact on the substrate to form a film. The powder material under supersonic impact , the particle body e...

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Problems solved by technology

[0006] CN102776461A discloses a new type of iron-aluminum thermal spraying powder core wire material. The main components of the core wire material and their percentage content are as follows: 40%-70% of aluminum powder, 10%-20% of magnesium powder, 30% of iron oxide %-55%, Potassium Chloride 2%-4%, all the other are Mn, Si, S, P impurity, described Potassium Chloride uses as the oxidizer of magnesium powder, and the heat released after the magnesium powder burns makes iron oxide and The aluminum powder undergoes a thermite reaction, and the product obtained from the aluminotherm reaction reacts with the remaining aluminum powder again to form an Fe-Al intermetallic compound, and the content of the S and P impurities is controlled below 0.03%. The coating formed by spraying the above-mentioned spraying materials on the surface of the substrate has insufficient adhesion on the substrate, and due to the addition of excessive iron oxide, the electrical conductivity and thermal conductivity of the coating are compared with those obtained by using aluminum powder alone as a spraying material. layer deteriorates, thereby limiting the scope of its application

[0007] CN103255410A discloses a method for preparing a magnesium alloy anti-corrosion coating, the method uses spherical aluminum powder or spherical aluminum powder and SiC or Al 2 o 3 powder; using compressed air as the gas source, low-temperature pneumatic spraying method to prepare the coating; the composition of the collected powder is 100% aluminum powder or 70-98% aluminum powder, 30-2% hard particles, the The hard particles are Al 2 o 3 Or SiC powder; its defect is that the coating formed by the composite aluminum powder used in this scheme has insufficient adhesion on the surface of the substrate, and it is easy to fall off, and the conductivity of the coating is also reduced compared to the coating obtained by pure aluminum powder as a spraying material

[0008] Although the above-mentioned documents provide some composite aluminum powders and preparation methods thereof, and spraying methods, there is still the problem of insufficient adhesion of the coating formed by the sprayed material on the surface of the substrate, so a coating after spraying is developed on the metal And composite aluminum powder with strong adhesion and high hardness on the surface of plastic substrates is still of great significance

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