Young’s modulus and hardness of multiphase CaZrO 3 -MgO ceramics by micro and nanoindentation

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

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2018 vol. 38 p. 2194 - 2201

0955-2219

The aim of this work is to determine the values of the hardness and elastic modulus of the phases present in CaZrO3-MgO-ZrO2 composites and to analyse their contribution to the composite properties. Two materialspreviously developed with the same major phases (CaZrO3, MgO and c-ZrO2) present in different volumefractions and grain size have been analysed. The hardness and Young?s modulus of each phase determined bynanoindentation are independent from the specific composite and coincident with nanoindentation values forsingle phase bulk materials. The contribution of the individual phases to Young?s modulus of the multiphasematerials is in agreement with calculations using the nanoindentation values and the Voight upper limit of the?rule of mixtures?. Scale effect due to microcracking has been observed for micro-hardness values of the compositesand differences between calculations and experimental values are related to this effect.