Characterization of Slurry Sprayed Mullite-Alumina based Thermal and Environment Barrier Coating
Department of Production & Industrial Engineering, PEC University of Technology, Chandigarh, India
ABSTRACT
Mullite-Alumina-based coatings were deposited on mild steel by a relatively simple and low-cost surface deposition technique based on the slurry spray technique (SST) developed for thermal and environmental barrier coating (TEBC) applications. There are many techniques to fabricate TEBC such as flame spray, HVOF, cold spray, Electric arc spray, EB-PVD and APS coatings. Thus, in this article mullite-alumina based TEBC is fabricated using SST process while maintaining its simplicity and cost effectiveness of fabrication technique. Properties like porosity, thickness of coating, hardness of coating are characterized according to Taguchi’s experimental design based on L9 orthogonal array. Microstructures of sprayed coating is studied by SEM and XRD. This mullite-alumina based Thermal and Environment Barrier coatings using SST reveal uniform coating deposits with adequate adhesion strength which is comparable with that produced from traditional techniques.
