CaZrO3-MgO structural cerámics obtained by reaction sintering of dolomite- zirconia mixtures

FERNANDO BOOTH; LILIANA GARRIDO; ESTEBAN AGLIETTI; ABÍLIO SILVA; PILAR PENA; CARMEN BAUDÍN

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2016 vol. 36 p. 2611 - 2626

0955-2219

Processing and properties of two fine grain and dense CaZrO3-MgO based composites obtained by reaction sintering of pure ZrO2 and dolomite (CaMg(CO3)2 are described. Two dolomites with different levels of impurities were used to fabricate the materials: high purity (impurity content ~1.2wt%, materials DBZ) and impure dolomite (impurity content-6.12wt% material DNZ). Mixture molar (1:1) were attrition milled and the reaction and sintering processes were studies using dynamic techniques (DTA-TG and dilatometry). Adequate sintering schedule was selected the controlled sintering technique. The role of impurities on the physical characteristics, microstructure and mechanical properties of the obtained composites was analysed. Noticeable changes in microstructure, porosity, grain size and phases, were observed as function of final sintering temperature at a 1350, 1400, 1450 and impurity content. The obtained microstructures are discussed on the basis of the phase equilibrium relationship.