Microsturcture Observation Of Plasma-Sprayed Ti0² Coating On Mild Steel Substrate

Ng, Shih Chien (2020) Microsturcture Observation Of Plasma-Sprayed Ti0² Coating On Mild Steel Substrate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Recently, several researches have shown that lo w wear and corrosion resistance of mild steel is affecting the performance and quality of mild steel in many applications. In order to overcome this problem, titanium dioxide (Ti02) coating can be used to provide wear protection layer of coating to the mild steel substrate. In this study, plasma spray coating is selected as the coating method to prepare Ti02 coating on the mild steel substrate as it is able to exhibit great adhesion bond t o the substrate. The objectives of this study is to characterize the Ti02 feedstock powders which were used to prepare plasma-sprayed Ti02 coating on the mild steel substrate. Besides, the micro structure of plasma-sprayed Ti02 coating on mild steel substrate were observed on its surface and cross section in order to identify melted and unmelted region of as-prepared coating. From the SEM observations, it was revealed that Ti02 feedstock powders exhibit an angular and blocky morphology. The PSA result confirmed that TiOz feedstock powders were in micron-sized which is suitable for pla sma spray process. In addition, XRD analysis also showed that both Ti02 feedstock powders and plasma-sprayed Ti02 coating consists of rutile and brookite phase and the major phase is rutile since rutile is the mo st stable phase a nd usually produced at high process temperature. The thickness of the coating is around 85μm as plasma spray able to fo rm thick coating thickness compared to other coating techniques. From the observation of microstructure of plasma-sprayed Ti02 coat in g, it was found that there are several pores, unmelted particles of coating and crack present on the substrate surface. Therefore, it is concluded that it is important to optimize the parameter of plasma spray coating and condition of mild steel substrate before performing coating process in order to get a flatten and even surface of coating which is able to give desired protection and retain the properties of mild steel.

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