caa a22 4500 467945756 CHVBK 20180322200725.0 cr unu---uuuuu 170328e19861101xx s 000 0 eng 10.1007/BF02431646 doi (NATIONALLICENCE)springer-10.1007/BF02431646 (NATIONALLICENCE)springer-10.1007/BF00553463 Fractographic study of the alumina and zirconia particles embedded in mullite prepared by reaction sintering [Elektronische Daten] [C. Baudin, F. Cambier, L. Delaey] Four different mullite-alumina-zirconia composites have been prepared by reaction sintering between alumina and zircon powders using magnesia or spinel (MgAl2O4) to increase the sintering and reaction rates. The microstructure of these materials can be described as composed of two parts: the first one is the mullite matrix containing various kinds of zirconia and alumina particles, whereas the second part is an amorphous phase in which alumina submatrices, zirconia and spinel particles are embedded. Examination of fracture surfaces allows one to identify the crack paths and shows that the main differences are related to zirconia inclusions. Analysis of mechanical properties and fracture features leads to the conclusion that crack deflection and microcracking are operative toughening mechanisms for the various materials. Moreover, a crack bowing mechanism is proposed to explain the higher modulus of rupture found for the series of materials prepared with magnesia as a reaction sintering aid. Chapman and Hall Ltd., 1986 Baudin C. Department Metaalkunde en Joegepaste Materiaalkunde, K.U.L., Leuven, Belgium aut Cambier F. Centre de Recherches de l'Industrie de la Céramique, Mons, Belgium aut Delaey L. Department Metaalkunde en Joegepaste Materiaalkunde, K.U.L., Leuven, Belgium aut Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4024-4028 0022-2461 21:11<4024 1986 21 10853 https://doi.org/10.1007/BF02431646 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02431646 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Baudin C. Department Metaalkunde en Joegepaste Materiaalkunde, K.U.L., Leuven, Belgium aut NATIONALLICENCE 700 1- Cambier F. Centre de Recherches de l'Industrie de la Céramique, Mons, Belgium aut NATIONALLICENCE 700 1- Delaey L. Department Metaalkunde en Joegepaste Materiaalkunde, K.U.L., Leuven, Belgium aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/11(1986-11-01), 4024-4028 0022-2461 21:11<4024 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553463 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer