Research on Thermal-shock Resistance of Thermo-chemical Reaction Flame Spraying Ceramic Coatings on AZ91D

To broaden the application of magnesium alloy,improve their performance,ceramic coating(Al2O3+TiO2+SiO2+ZnO+Al) was produced by flame spraying on the surface of magnesium alloy AZ91D.The magnesium alloy becomes into a new type of composite material with metal performance(strength and toughness)and ceramic properties(high-temperature resistance,corrosion resistance and so on).MgSiO4,MgAl2O4 and so on were found in the coatings by X-ray analysis.That means in the process of flame spraying accompanied by a thermo-chemical reaction,it happened between the ceramic powder and the matrix,ceramic powder and ceramic powder.A new way of combining was found in the process of thermo-chemical reaction,that was chemical combining.The traditional ways were machinery chimeric and physical combining.The thermal shock test shows that ceramic coatings have good thermal-shock resistance.