Please use this identifier to cite or link to this item: doi:10.22028/D291-24534
Title: Preparation of Al2O3/SiC nanocomposites with in-situ formed SiC
Author(s): Hopf, Jürgen
Aslan, Mesut
Schmidt, Helmut K.
Language: English
Year of Publication: 2006
OPUS Source: Ceramic forum international. - 83. 2006, 4, S. E39-E44
SWD key words: Nanokomposit
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Powder mixtures containing Al2O3, SiO2 and carbon black were calcined at 1625°C to form nanoscaled SiC within Al2O3 by means of the carbothermal reduction of SiO2. The prepared powders contained 5 and 10 vol. % SiC. These powders were densified by hot pressing, and composite ceramics with densities up to 99 % obtained. Microstructural analyses of the hot-pressed composites showed a monogeneous distribution of SiC particles with a particle size mainly under 100 nm. The fracture mode was intragranular. The fracture toughness determined by the ICL method using the Niihara approach for Palmqvist cracks was in the range of 5 MPa-m0,5. The fracture strength determined in a four-point bending test was around 540 MPa for the hot-pressed samples and around 630 MPa for the hot-pressed and postannealed samples.
Link to this record: urn:nbn:de:bsz:291-scidok-31039
Date of registration: 3-May-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
NT - Materialwissenschaft und Werkstofftechnik
Former Department: bis SS 2016: Fachrichtung 8.4 - Werkstoffwissenschaften
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