Effect of temperature on the sintering behavior of CeO2-La2O3 doped with silicate

Caio Daniel Barros de Alecrim, Jorge Luís Marques Garcia, Luiz Francisco dos Santos Neto, Olyverson Lyra Porto, Juliana Pereira Flor, Catia Fredericci

Resumo

This paper evaluates the sintering behavior of CeO2-La2O3-silicate at different temperatures. The sintered compact of this system may be a candidate to be used as a refractory lining for biomass (sugarcane bagasse) gasifier. The raw material (CeO2-La2O3-silicate powder) was
characterized by granulometric distribution, differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and dilatometry. Cylindrical compacts of this powder were heat treated at 1200 ºC, 1300 ºC and 1400 ºC for 1 h and characterized by X-ray diffraction (XRD), micro Raman spectroscopy, SEM/EDS, shrinkage and apparent porosity. The results show that the sintering degree of the samples increases with temperature, reaching shrinkage of about 16 % and apparent porosity of 3.5 % at 1400 ºC. The XRD and Raman spectroscopy results revealed that a cerium/ lanthanum silicate was formed which is stable against melting at temperature as high as 1400 ºC. The study of the reactivity of the bagasse ash and the CeO2-La2O3-silicate refractory will be presented in a future publication.

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