• GUOCHAO CHEN

Articles written in Bulletin of Materials Science

• Preparation of an aluminium phosphate binder and its inﬂuence on the bonding strength of coating

In this paper, aluminium phosphate binders were synthesized using Al(OH)₃ and H₃PO₄ as the raw materials. These binders, with the curing agent MgO and ﬁller ZrO₂, were used to prepare coatings by brush painting on the carbon ﬁbre-reinforced epoxy resin matrix composites. The inﬂuences of synthesis conditions such as the P/Al ratio, concentration of the reactant and reaction temperature on the viscosity of binders and the bonding strength of corresponding coatings were investigated by using a viscometer and a universal testing machine. The structures and compositions of aluminium phosphate binders were characterized by X-ray diffraction, Fourier transform infrared and Raman spectroscopy. The results show that with a decrease in the ratio of P/Al, the degree of polymerization of the aluminium phosphate binder increases, the viscosity increases, while the bonding strength of the coating decreases. When P/Al = 3:1, the reaction product is Al(H₂PO₄)₃ with the best properties of bonding strength. As the concentration of phosphoric acid solution increases in the range of 60–80%, the viscosity increases on account of larger quantity of viscous molecules in a unit volume and higher extent of polymerization of the phosphorus oxygen tetrahedron. The compositions of aluminium phosphate binders are almost the same when the reaction temperature changes from 120 to $180^{\rm o}$C, so the viscosity of the binder and the bonding strength of the coating do not exhibit obvious changes along with temperature.

• # Bulletin of Materials Science

Volume 43, 2020
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Continuous Article Publishing mode

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