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Titel: Microstructural characterization of Al2O3-SiC nanocomposites
Verfasser: Schmid, Herbert K.
Aslan, Mesut
Assmann, Steffen
Nass, Rüdiger
Schmidt, Helmut K.
Sprache: Englisch
Erscheinungsjahr: 1998
Quelle: Journal of the European Ceramic Society. - 18. 1998, 1, S. 39-49
SWD-Schlagwörter: Mikrostruktur
Nanokomposit
Aluminium oxydatum
Rissausbreitung
Korngrenze
Kornwachstum
Nanostrukturiertes Material
Sintern
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: Al2O3 composite ceramics containing 10 vol% SiC nanoparticles were prepared by pressureless sintering. SiC particles < 150 nm detach from the matrix grain boundaries during grain growth and are predominantly observed in intragranular positions, whereas larger SiC particles retain intergranular positions. Thermal expansion mismatch causes local residual tensile stresses in the matrix grains, giving rise to strain contrasts in TEM imaging; occasionally microcracking around intragranular inclusions &ge; 100 nm is observed in thin TEM foils. It appears that the volume fraction of intragranular SiC particles in the size range 100 < d < 150 nm should not exceed &asymp;0.5% in high strength/high toughness Al2O3-SiC nanocomposites. The interaction between propagating cracks and internal stress fields around intragranular inclusions forces a transgranular fracture mode. Grain boundary pinning by large intergranular SiC particles, in combination with solute drag inhibits matrix grain growth, while the presence of an amorphous phase at Al2O3 grain boundaries and Al2O3-SiC phase boundaries assists in densifi cation. Excess liquid phase is exuded from the interfaces during consolidation and accumulates in large pores, stabilized by the accidental agglomeration of large SiC particles.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-28853
hdl:20.500.11880/24635
http://dx.doi.org/10.22028/D291-24579
SciDok-Publikation: 11-Jun-2010
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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