Abstract No.:	2844
Title:	Metastable mullite coatings obtained by nanosprayquench process
Authors:	Sergi Dosta / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN Dosta Sergi / CPT Thermal Spray Centre, Spain Judith Ventayol/ CPT Thermal Spray Centre, Irene G. Cano/ CPT Thermal Spray Centre, Josep M. Guilemany/ CPT Thermal Spray Centre,
Abstract:	During the last years, competitive solutions have been studied to produce components in applications with high temperature wear and corrosion resistance needs such as heat exchangers. Deposition of ceramics like zirconia or mullite through PVD, CVD, EB-PVD and APS has been successful. One way of improvement of these components is to produce nanostructured coatings. NANOSPRAYQUENCH process appears as a cost-effective process to produce metastable mullite coatings using microstructured conventional powder as feedstock. Structural evolution from metastability to nanostructure after thermal treatments has been evaluated through DSC-TGA analysis, XRD, RAMAN and FESEM. It could be observed that a high percentage of amorphous phase evolve to pseudotetragonal at intermediate temperatures, to finally obtain a completely crystalline coating with a single orthorhombic mullite phase at higher temperatures.

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