TEM ANALYSIS OF NANOCRYSTALLINE SiC CERAMICS SINTERED BY SPS USING Al2O3-TiO2 ADDITIVE

TEM ANALYSIS OF NANOCRYSTALLINE SiC CERAMICS SINTERED BY SPS USING Al2O3-TiO2 ADDITIVE

Nanocrystalline SiC ceramics were fabricated by spark plasma sintering (SPS) using Al2O3 and TiO2 additives, with the composition of 5, 10 and 20 wt% (Al2O3-TiO2). XRD revealed formation of a TiC phase. Mullite phase with preferred orientation was also detected in SiC with 20 wt% addition. TEM and E...

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Veröffentlicht in:Journal of Asian Ceramic Societies 2013-09, Vol.1 (3), p.267-273
Hauptverfasser: Shinoda, Y, Suzuki, Y, Yoshida, K
Format: Artikel
Sprache:eng
Schlagworte:
Additives
Ceramics
Mullite
Silicon carbide
Spark plasma sintering
Titanium carbide
Titanium dioxide
Transmission electron microscopy
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Zusammenfassung:Nanocrystalline SiC ceramics were fabricated by spark plasma sintering (SPS) using Al2O3 and TiO2 additives, with the composition of 5, 10 and 20 wt% (Al2O3-TiO2). XRD revealed formation of a TiC phase. Mullite phase with preferred orientation was also detected in SiC with 20 wt% addition. TEM and EDS identified TiC, aluminosilicate glass and mullite crystal phases. Segregation of titanium atoms in addition to aluminium and oxygen atoms was seen at the intergranular glassy phase with a thickness of 1-2 nm. The electrical conductivity was similar to Al2O3 single addition to SiC ceramics.
ISSN:2187-0764
2187-0764
DOI:10.1016/j.jascer.2013.06.004