金属蜂窝载体表面负载活性氧化铝涂层的研究

采用高温氧化法对合金FeCrAl金属基体进行预处理，使用AlOOH胶浸渍活性涂层，考察了氧化温度、氧化时间、料浆配方、制备条件以及焙烧温度等因素对涂层的影响。利用XRD、SEM、BET和超声波振动等方法研究了样品的表观性能和涂层的结合性能。结果表明，950 ℃氧化10 h的氧化处理可以在金属基体上形成粗糙的表层，增加涂层粘结能力。在料浆的制备过程中，加入添加剂以及提高活性涂层的焙烧温度都可以明显提高涂层与金属载体的结合力,得到的涂层牢固，比表面积达212 m²·g^-1，满足工业应用要求。

Study on loading of γ-alumina washcoat on FeCrAl metallic honeycomb support

Alumina washcoat on metallic honeycomb support was prepared using pseudoboehmite, HNO₃, and other additives after high temperature oxidation pretreatment. The microstructure and surface properties of the washcoat/metallic honeycomb were investigated by XRD, SEM, BET and ultrasonic vibration. The results showed that rough layers formed on metal foil surface during pre oxidation at 950 ℃ for 10 h, which exhibited excellent compatibility with γ alumina based washcoat. Properties of the washcoat were affected by properties of the slurry gel, such as types of the surfactants, viscosity,solid content, particle size and particle size distribution. The washcoat, with BET surface area of 212 m²·g^-1, had excellent resistance to attrition and met the requirement of commercial application.