Journal of Welding and Joining

: Journal of KWJS. 2006;24(5):57-61. Published online January 4, 2007.; The Development of Functional Photocatalytic TiO₂-Biodegrdable Plastic Composite Material by HVOF Spraying; Hee-Seon Bang, Han-Sur Bamg, Akira Ohmori

Abstract: For the production of functional TiO₂-biodegradable plastic (polybutylene succinate:PBS) composite material with photocayalytic activity, we attempted to prepare TiO₂ coatings on PBS substrate by HVOF and plasma spraying techniques under various conditions. The microstructures of coatings were characterized with SEM and XRD analysis, and the photocatalytic efficiency of coatings was evaluated by the photo degradation of gaseous acetaldehyde. The effects of primary particle size and spraying parameters on the formation behavior, photocatalytic performance of the coatings have been investigated.
The results indicated that for both the HVOF sprayed P₂?? and P₃? coatings, the high anatase ratio of 100% can be achieved regardless of fuel gas pressure. On the other hand, the HVOF sprayed P7 coating exhibited a largely decreased anatase ratio (from 100% to 49.1%) with increasing the fuel gas pressure, which may be attributed to much higher susceptibility of heat for 7 ㎚ agglomerated powder. HVOF sprayed P₂?? and P₃? coatings show better performance as compared to that of plasma sprayed P₂?? coatings owing to the higher anatase ratio. However, the HVOF sprayed P? coatings did not show the photocatalytic activity, which may result from the extremely small reaction surface area to the photocatalytic activity and low anatase ratio.

Keywords :TiO₂-biodegradable;Plastic photocayalytic activity;HVOF spraying;Anatase ratio