Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1261-C7-1266
Mullite-alumina functionally gradient ceramicsP. PENA, J. BARTOLOMÉ, J. REQUENA and J.S. MOYA
Instituto de Cerámica y Vidrio (C.S.I.C.), 28500 Arganda del Rey Madrid, Spain
Cracks free mullite-alumina Functionally Gradient Ceramics (FGC) have been obtained by sequential slip casting of Mullite-alumina slurries with different mullite/alumina ratios. These slurries were prepared with 65 % solids content and viscosities ranging from 10 to 40 mPa.s. The presence of cracks perpendicular to the FGC layers have been attributed to residual stresses developed because of the mismatch in thermal expansion between layers. The microstructure of the different layers, and de residual stress value σR in each layer was also determined.
© EDP Sciences 1993