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Al2O3 // 3Y-TZP // Graphene multilayers produced by tape casting and spark plasma sintering. A rheological, sintering and characterization study

AuthorsBorrell, Amparo; Salvador, M. D.; Rayón, Emilio; Gutiérrez-González, C. F. ; Rincón, Acacio; Moreno Botella, Rodrigo María; Chinelatto, Adriana S. A.
Issue Date2014
CitationCIMTEC 2014
AbstractThe aim of this work is to propose a procedure to obtain dense and free defects multilayered alumina-zirconia coatings with graphene. Green tapes of alumina alumina+5vol.%3Y-TZP and alumina+5vol.%3Y-TZP mixed with graphene-oxide (2 vol.%) were obtained by aqueous tape casting. of the three compositions. The rheological behaviour of concentrated suspensions was optimized considering the sonication mode and time and the content of deflocculant. Green tapes were punched and laminated in order to form ceramic laminates alternating up to 18 layers The obtained multilayer discs with 20 mm in diameter were sintered by spark plasma sintering (SPS) technique at 1400 ºC under vacuum and with pressure. By means of optical and electronic microscope images of the ceramic cross-sections, it was revealed that the sintered laminates had a high green density and layer thicknesses of 100 µm without any apparent defect showing a good cohesion between them. Raman spectroscopy analysis confirmed the presence of tetragonal zirconia in alumina coatings and revealed carbon content inside all the samples. Nanoindentation results revealed that hardness and elastic modulus values were similar for all coatings, being higher than 27 GPa and 300 GPa, respectively.
DescriptionTrabajo presentado al 13th International Ceramics Congress celebrado en Montecatini Terme (Italia) del 9 al 17 de junio de 2014.
Appears in Collections:(CINN) Comunicaciones congresos
(ICV) Comunicaciones congresos
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