Abstract No.:	1350
Title:	Ceramic metastable bulks through plasma spraying
Authors:	Sergi Dosta* / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN I.G. Cano/ Thermal Spray Centre (CPT), SPAIN J.R. Miguel/ Thermal Spray Centre (CPT), SPAIN J.M. Guilemany/ Thermal Spray Centre (CPT), SPAIN
Abstract:	Ceramic bulks formed by metastable phases were produced by thermal spray based process. This process combines the atmospheric plasma spray and a liquid nitrogen quench (APS-Q process). Previous studies have demonstrated the efficiency of the process to produce metastable powders and coatings [1] and, the evolution from these metastable structures to nanomaterials have been corroborated [1,2]. In this work, self-sustained forms were obtained by APS-Q process with different geometrical shapes. Different process conditions were also considered, analysing the consequences in the final bulk microstructure. The bulk specimens were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Mechanical properties were measured through Vickers indentations evaluating the temperature behaviour. [1] I.G.Cano, S.Dosta, J.R.Miguel, J.M.Guilemany. ?Production and Characterisation of Metastable Al2O3-TiO2 Ceramic Materials?. J. Mater. Sci. 2007 (in press, JMSC6129R1) [2] S.Dosta, I.G. Cano, J.R. Miguel , J.M. Guilemany. ?Production and Characterisation of Metastable ZrO2-Al2O3 Coatings obtained by APS + Quench?. International Thermal Spray Conference. ISBN 13:978-0-087170-855-7. Beijing May 2007.

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