采用等离子喷涂方法在304不锈钢表面制备了TiO_2、AT40(40%TiO_2,60%Al_2O_3)涂层,研究了涂层对甲基橙的光催化降解性能.采用金相分析方法和扫描电镜(SEM)观察了涂层微观结构,用X射线衍射法分析了涂层的相结构.结果表明:涂层与基体结合紧密,表面的孔隙有利于降解率的提高,锐钛型TiO_2的含量是影响光催化效果的关键,纯TiO_2涂层的降解率高于AT40涂层.
TiO_2 and AT40(40%TiO_2:60% Al_2O_3)coatings on 304 stainless steel were prepared by plasma spra-ying in order to study the properties of photo-catalytic degradation of methyl-orange. The micro-structure of the as-sprayed coatings was characterized by metallographic analysis and SEM. X-ray diffraction was used to evaluate the phase structure of the coatings. The results show that the combination of the coatings is very tightness. The porosity is propitious to im-prove the photo-catalytic property. The content of rutile TiO_2 is the key factor for the Photo-catalysis. The degradation rate of the pure TiO_2 coating is better than the AT40 coating.
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