Effect of processing parameter on hydrolysis method to produce titanium dioxide for thermal spray process

Mohamad Fadzil, Nurzurida (2022) Effect of processing parameter on hydrolysis method to produce titanium dioxide for thermal spray process. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Titanium dioxide (TiO2) is a white form powder primarily used for various applications. It has become the most famous substance due to its unique properties, which are allowed as pigments, coatings, foods, and most importantly, one of the most promising components in the photocatalysis mechanism. One of the most famous environmental photocatalysis applications is for air purification or as a coating for surfaces such as buildings. Application photocatalyst for coating faces shows promising results since the surface coated with titanium dioxide can sustain as mould free for many years. This study aims to analyze the effect of processing parameters such as the stirring speed and stirring time on the hydrolysis method to produce TiO2. The as-synthesized TiO2 powders will be used as the feedstock for thermal spray process. During the hydrolysis method, the titanyl sulphate was hydrolyzed with distilled water at different stirring times (4hrs, 6hrs, and 8hrs) at 350 rpm and different stirring speeds (60 rpm, 125 rpm and 350 rpm) for 8hrs. The white precipitate was formed from the hydrolysis process would be dried in an oven for 10hrs at 120ºC. All the samples were characterized using XRD, PSA, FTIR, and SEM. XRD confirmed the presence of anatase as the only phase in all the synthesized TiO2 powders. The results show that when the sample was stirred for 8 hours at 350 rpm, the most agglomerated particles were produced with a 15.51 µm particle size and a 19.28 nm crystallite size, making it the best fit for thermal spray application. PSA and SEM images reveals that increased of stirring rates would enhance the agglomeration process and result in a more even distribution of sizes. SEM images also show that the particles are packed most densely and form spherical shapes with better agglomeration when the stirring rates are increased by increasing the stirring time and speed. This study demonstrated the significance of processing parameters on the development of naturally agglomerated micron-size anatase structures using TiO2 as a feedstock for the thermal spray process, which can allow a stable and better performance during coating or photocatalysis applications.

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