Materials formulated in the ZrO2-MgO-CaO system for advanced structural applications

Reference Presenter Authors
(Institution)
Abstract
14-010 Carmen Baudin Baudin, C.(Instituto de Cerámica y Vidrio, CSIC); Silva, A.(University of Beira Interior); Pena, P.(Instituto de Cerámica y Vidrio, CSIC);
The recent trends in materials engineering favour composite materials as opposed to single phase ones. In this sense, considerable improvement in the properties of ceramics has been attained by combining one or more components to obtain ceramic-ceramic composites. 
The most known multiphase ceramics for severe environments are refractories. Oxide refractories are responsible for the success of essential industries connected to high temperature processing, such as glass factories, cements and steel plants. Those oxide mixtures that are successful in the refractory field can be proposed as basis for advanced structural materials when adequate processing is used. In particular, powder conditioning and strict impurity control are necessary when natural raw materials are used.  
This work is a part of a wider project focused to the development of new multiphase oxide ceramics for structural applications of high responsibility with compositions inspired by those of refractories. CaZrO3 presents crystalline average thermal expansion coefficient and thermal conductivity similar to yttria fully stabilized zirconia (YFSZ), therefore, CaZrO3 materials can be considered as substitutes of YFSZ in structural applications. 
In this work, the ternary system ZrO2-MgO-CaO has been chosen for developing CaZrO3–based materials due to the high temperature (1982 ºC) of the eutectic point ZrO2-CaZrO3-MgO. Dense CaZrO3–MgO based composites with fine microstructure have obtained using synthetic and natural raw materials. The potential of the obtained materials for high responsibility structural applications is discussed on the basis of their microstructure and mechanical behaviour.
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