Characterization Of Feedstock Powder With Different Morphology For Plasma Sprayed Titania Coating

Ahmad, Aina Syuhada’ (2019) Characterization Of Feedstock Powder With Different Morphology For Plasma Sprayed Titania Coating. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In recent years, several research has shown that thermal spray techniques, especially atmospheric plasma spraying (APS), can be used to get TiO2 coatings which can apply in various applications and improve properties of the substrates. In this work, the characterization of feedstock powder with different morphology for plasma sprayed titania coating were studied. Three different powder with different morphologies, which were fused and crushed TiO2 powder (6505), agglomerated TiO2 powder (Tayca), and agglomerated spray dried TiO2 powder (6233C) were used as the feedstock materials to prepare sintered dense TiO2 pellets which mimic or simulate the titania coating using APS method. The properties of the feedstock powders were confirmed using particle size analyzer (PSA), scanning electron microscope (SEM) and x-ray diffraction (XRD). Then, each powder were pressed using uniaxial pressing to form dense bodies and sintered at 1000°C to simulate the actual temperature for the APS coating process. The properties of sintered dense TiO2 pellets were characterized using SEM, XRD and the hardness were measured using hardness tester. The presence of anatase, brookite and rutile phase in the TiO2 powders were confirmed by XRD. PSA and SEM confirmed that all the TiO2 powders were in micro meter sized which are favourable for plasma spray process. This study found that sintered dense body made from Tayca powder having the highest hardness with lower porosity as compared to dense bodies made from 6233C and 6506 powder which due to the property of the initial powder which is agglomerated of nanoparticles. XRD analysis also reveals that all the initial phase of TiO2 were transformed to other phase after the sintering process. Hence, it is concluded that sintering of dense TiO2 powders have changed the properties of the initial feedstock powders

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