AZ91D热化学反应热喷涂陶瓷涂层热震性研究

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

为拓宽镁合金的应用领域,提高其使用性能,在镁合金AZ91D表面使用火焰喷涂技术制备Al2O3+TiO2+SiO2+ZnO+Al陶瓷涂层,通过制备涂层使其成为既有金属的强度和韧性,又有陶瓷耐高温、耐腐蚀等优点的复合材料。陶瓷涂层X射线衍射分析发现,涂层内有Mg2SiO4、MgAl2O4等新相生成,这说明在喷涂制备涂层过程中,陶瓷粉末与基体、陶瓷粉末相互之间有热化学反应进行,热化学反应的发生为涂层与基体在传统的机械嵌合和物理结合方式的基础上增添了化学结合。经热冲击试验测试,陶瓷涂层具有良好的抗热震性能。

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 AZ91 D. 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.