Effect of Substrate Properties on Adhesion Strength of Cold Sprayed TiO2

Effect of Substrate Properties on Adhesion Strength of Cold Sprayed TiO2 N Irinah bt Haji Omar1,2*, K. Ogasawara1, M. Yamada1, T. Yasui1 and M. Fukumoto1 1) Department of Mechanical Engineering, Toyohashi University of Technology, 1-1, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan *Corresponding email : irinah_n@isf.me.tut.ac.jp Titanium dioxide has been the most investigated functional ceramics due to its outstanding performance in wide range of applications, chemical stability and low cost. One of the most promising properties of TiO2 is photocatalicity. In the previous studies, it was possible to fabricate pure TiO2 coatings by cold spray process. However, the details of the deposition mechanisms have not been clarified yet. The aim of this work is to investigate the effect of the substrate properties on the adhesion strength of the cold-sprayed TiO2 coatings. Experiments were carried out using several substrate materials with various substrate temperatures. Process parameters that changed systematically was substrate temperature, and the effect of these parameters on the deposition behavior of individual particles was also investigated. The tensile adhesion strength, substrate hardness, substrate surface oxide and interfacial microstructure were evaluated for the coatings. (160 words) Keywords cold spray, TiO2, substrate temperature, substrate material, bonding mechanism