Abstract
This study is aiming at controlling the microstructure of plasma sprayed Al2O3-TiO2 composite coatings using freeze granulated powders. As sprayed and sintered Al2O3 + 3wt%TiO2 powders were air plasma sprayed with industry process parameters and compared with a commercial powder. The resulting coatings were investigated with respect to powder flowability, porosity and microstructure of the granules. The results showed that microstructure and melting fraction in the coatings could be tailored with the freeze granulation process and heat treatment conditions.
Highlights
Plasma sprayed alumina-titania coatings are well known for their excellent properties against wear, corrosion, thermal impact, and crack resistance
This study aims to describe the influence of the feedstock powders on the microstructure and melting fraction of AT3 coatings sprayed with an industrial standard Air Plasma Spray (APS) process
The volume of the internal pores is decreased with increased sintering temperature XRD revealed a single phase α-Al2O3 in both as-frozen granules and Amperit powder (Figure 2)
Summary
Plasma sprayed alumina-titania coatings are well known for their excellent properties against wear, corrosion, thermal impact, and crack resistance. They have been largely applied to protect structural components and machine parts in machinery, textile, and aircraft industries [1]. During the spray process, feed powder particles are injected into a plasma flame, melted and accelerated towards a substrate where they impact to form a coating [2]. The properties of the coatings depend upon the achieved microstructure, which can be controlled by both the process parameters and properties of the feedstock powder. To achieve the required feedstock with fine particles, the powder has to be reconstituted into granules with suitable size using slurry and spray drying process.
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