Characterization Of TiO2 Coating Prepared By Thermal Spray Process

Mohamad, Marina (2019) Characterization Of TiO2 Coating Prepared By Thermal Spray Process. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Anatase phase of Ti02 is easily transform to rutile phase by conventional thermal spray process due to the high processing temperature. The transformation is reversible and not desirable as it will reduce photocatalytic activity of Ti02. Therefore, coating technique that require low process temperature is needed to preserve the formation of anatase phase in the as-prepared coating. In this project, Ti02 anatase coating were fabricated using cold spray process. Prior to the coating, the as-received Ti02 powders were characterized using SEM, XRD and PSA. Then, the agglomerated Ti02 powder was injected into nitrogen gas stream and deposited onto copper substrate. The process temperature involved were 350°C and 600°C. The prepared coatings were characterized by SEM, XRD and surface roughness. The hardness measurement was also measured on the cross section of the coating. The XRD analysis on the as-received Ti02 powders showed that only anatase phase was exist. SEM observation showed that the powders were in agglomerated form composed of nanoparticles as the primary particles. PSA revealed that the Ti02 powders were homogeneously distributed. The study showed that the thickness of coating was increased with increasing of the process temperature during the cold spray deposition. The surface roughness of the coating was decreased as the temperature was increased. Moreover, XRD analysis confirmed that the anatase phase was preserved after the deposition of the coating. Therefore, cold spraying is suitable process to produce Ti02 anatase phase coating

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