Effect of Binders on Aluminum-based Composite Sealing Coatings and Coating Properties
Aluminum based composite coatings are mainly used for sealing coatings on low-temperature components of aircraft engines.In this paper,aluminum based composite coatings were prepared using mechanical mixing technology and sprayed with wear-resistant sealing coatings.Four different phosphate binders with different densities were compared and analyzed to prepare aluminum based composite sealing coatings and their performance.The results showed that the density of the binder had a significant impact on the viscosity of aluminum based composite sealing coatings,and the appropriate viscosity of the coating was beneficial for spraying,resulting in a coating with a uniform microstructure by using a phosphate binder with density of 1.45 g/cm3 to prepare aluminum based composite coatings,the viscosity was moderate,the spraying process is stable,and the coating structure is uniform,with a hardness of 67.3 HR15Y and a bonding strength of 6.18 MPa.As a sealing coating,the performance is good;The formation of a network structure through heating,dehydration,and polymerization of phosphate is the main factor for the strong bonding performance of the coatings.The higher the proportion of phosphate used,the more phosphate molecules are distributed in the coating,and the denser the three-dimensional network structure formed,which is conducive to improving the bonding strength of the coating.
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