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Study on High - speed Arc Spraying of Aluminum - based Alumina

Author: langfeng Time: 2017-08-31

Study on High - speed Arc Spraying of Aluminum - based Alumina

The anti-skid handling of the ship's main deck has always been one of the problems that plagued us. Many steel structures and components on the ship,such as the top deck, equipment and equipment handling area, personnel activities corridor, helicopter deck piles and other parts of the anti-skid surface has a high demand, the friction coefficient of 0.6 or more. Shipboard helicopters and personnel safety depends mainly on helicopter tires and aprons and personnel between the soles and the deck of sufficient friction. The anti-slip surface coating is a traditional composite coating system, that is, polymer and large particle size of the organic composite coating composed of emery. The corundum has a grain size of 0.45 to 0.9 mm and a coating thickness of 1.5 mm. However, this organic coating is easy to aging, short life, the combination of corundum and polymer coating strength is low, the use of easy to fall off, poor wear resistance, and thus the friction coefficient of poor ability to maintain. In addition,the polymer coating can cause environmental pollution.
Equipment maintenance surface engineering research center using high-speed arc spraying aluminum powder core material method to effectively solve this problem. First, Al-based Al2O3 powder core was prepared. The skin is Al, the powder core is Al2O3 ceramic particles. In order to solve the problem that the deposition rate of Al2O3 ceramic particles is low and the bonding strength with aluminum matrix is ​​poor, a thin layer of ultrafine aluminum powder is coated on the surface of Al2O3 particles, so that ultrafine aluminum powder is first melted due to low melting point, Al2O3 particles of the heating effect, and the formation of intermittent aluminum film can greatly improve the bonding strength with the aluminum matrix.
This new type of anti-skid coating in the hunting submarine main deck on the practical application. When working, first spray a layer of corrosion-resistant pure aluminum coating on the substrate, used to prevent seawater corrosion of steel, and then continue to spray a layer of Al-based Al2O3 anti-skid coating, and finally using dilution deck paint sealing treatment, see Figure 5. Practical application shows that the composite coating depends on the role of Al2O3 particles with a good anti-skid effect, but also has excellent corrosion resistance. Has become an effective means of anti-skid handling of ships.
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