Optimization of the sintering schedule for multiphase materials obtained by reaction sintering of ZrO2- CaMg (CO3)2,

F BOOTH,; L.B. GARRIDO; E.F. AGLIETTI ; P. PENA ; C. BAUDÍN

Toledo

Congreso; ECERS XIV International Conference European Ceramic Society; 2015

Reaction sintering is a classic process for manufacturing multiphase advanced ceramic materials. This method is based on thermal treatment of mixtures of incompatible compounds. Reaction and sintering occur during the thermal treatment; such processes may or may not occur simultaneously. The fundamental problem is to adjust the thermal cycle in a way that the complete reaction of the components as well as high density is achieved. Adjusting the thermal cycling presents additional problems when part of components experience significant weight loss during the heat treatment.This work is a part of a larger study on the capability of multiphase materials based on CaZrO3, and ZrO2 for advanced structural applications. Ceramic and refractories based on MgO-CaZrO3-c-ZrO2 are also interesting materials for structural applications and in particular have high resistance to corrosion attack, the process of reaction sintering of dolomite-zirconia mixtures is described and discussed.Composites constituted by CaZrO3, MgO and c-ZrO2 with density higher than 99% of the theoretical density using maximum sintering temperatures between 1350 and 1450ºC have been obtained. The microstructures were analyzed a function of the sintering conditions.