Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-955-C7-960
Elaboration and TEM structural study of interfaces in composites produced by precipitationJ. DU1, A. TRAVERSE2, A. PEYROT1, 3, M. BACKHAUS-RICOULT3 and S. HAGÈGE1
1 CNRS-CECM, 94407 Vitry, France
2 CNRS-CSNSM, 91405 Orsay, France
3 CNRS-LPM, 92195 Meudon, France
Model ceramic matrix composites have been manufactured in a wide range of materials using the precipitation of a metal (Cu, Ni, Cr) in a ceramic matrix (nitride AIN or oxides MgO, Al2O3) providing, in each case low energy configurations at the heterophase interfaces. In connection to microelectronic applications, copper metallic particles precipitate in AIN after implantation by copper ions and anneal of the ceramic matrix. Faceted particles are imaged by HRTEM and are associated to a low energy structural and chemical configuration. Internal reduction experiments have been carried out on (Mg,Ni)O, (Mg,Cu)O and (Al,Cr)2O3 mixed oxides; the morphology, chemical composition and orientation relationship of the different precipitates are obtained through TEM observations and discussed in terms of interfacial energy and precipitate growth mechanism and kinetics. Conventional and high resolution TEM in conjonction to structural models have allowed a comprehensive description of the interface.
© EDP Sciences 1993