Abstract
Agglomerated and clushed TiO_2 powders were sprayed by cold spray equipment on an Aluminum (JIS A-1100) substrate. DYMET 412k manufactured by OSPC was used as cold spray equipment and the process gas was compressed air. Sprayed specimen were observed and analyzed by FE-EPMA. Gas decomposition test was carried out using acetaldehyde gas under ultra-violet (365nm) and visible (405nm) LED irradiation. Their impacted particle morphology on substrate was different. Clushed TiO_2 powder could not form coating and their particles were put into substrate. Agglomerated TiO_2 particle powder could form very thin coating and the sprayed plate could decompose acetaldehyde gas under both LED irradiations. It was indicate that cold spraying was useful method to deposit photocatalytic powder.
