http://www.cnr.it/ontology/cnr/individuo/prodotto/ID43288
Microstructure and Properties of alumina-sic nanocomposites prepared from ultrafine powders (Articolo in rivista)
- Type
- Label
- Microstructure and Properties of alumina-sic nanocomposites prepared from ultrafine powders (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Sciti D., Vicens J. Bellosi A. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Titolo
- Microstructure and Properties of alumina-sic nanocomposites prepared from ultrafine powders (literal)
- Abstract
- Alumina - Silicon Carbide nanocomposites were produced and studied under
different aspects: characteristics of the starting materials, processing,
microstructure and mechanical properties. The raw materials were two kinds
of fine SiC powders (30 and 45 nm) and two Al2O3 powders (60 and 140 nm).
Different compositions (amounts of SiC in the range 0.5 - 5 vol %) were
performed and the characteristics of the resulting materials compared. The
oxygen enrichment in SiC nanopowder due to specific powder treatments was
controlled, in order to optimize powder processing routes. Densification
tests of Al2O3-SiC powder mixtures were performed both by pressureless
sintering and hot pressing route.
The addition of SiC reduced the densification rate and favoured a
refinement of the matrix. Improvement of mechanical properties over
monolithic alumina was obtained in composites with the 45 nm SiC. The
study pointed out that the critical factor for the success of these
materials is the choice of the raw SiC powders in terms of grain size and
state of agglomeration. The addition of this ultrafine SiC strongly
affected the microstructural evolution, even at low volumetric fractions.
The results do not substantiate any remarkable effect by dispersoids in
the tested nanosize range.
(literal)
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