C. J. Li, G. J. Yang, G. J. Liu, C. X. Li, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China; S. Q. Fan, School of Science, Xi'an Jiaotong University, Xi'an, China
The control of microstructure of TiO2 coating through processing conditions influences significantly the property and photocatalytic performance of the coating. In this study, vacuum cold spray process as a novel coating technique is employed to deposit nanostructured TiO2 coatings on glass substrates. The microstructure of the coating is characterized by scanning electron microscopy, x-ray diffraction analysis, transmission electron microscopy. TiO2 deposits were produced using different types of TiO2 powders of different particle size. The deposition characteristics of TiO2 were examined under different deposition conditions. The results showed that nanostructured TiO2 coating deposited by vacuum cold spray is different from TiO2 coating deposited by wet method.
Summary: Vacuum cold spray is employed to deposit nanostructured TiO2 coatings on glass and stainless steel substrates. The results showed TiO2 coating was stacked of particles in agglomerate of several hundred nanometers of nano TiO2 particles, presented an apparent dense microstructure, and retained the crystalline structure of the starting powder. The coating thickness can be controlled through spray pass.
