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Rare-earth element doped Si3N4/SiC micro/nano-composites-RT and HT mechanical properties
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SYSNO ASEP 0345837 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Rare-earth element doped Si3N4/SiC micro/nano-composites-RT and HT mechanical properties Author(s) Lojanová, Š. (SK)
Tatarko, P. (SK)
Chlup, Zdeněk (UFM-A) RID, ORCID
Hnatko, M. (SK)
Dusza, J. (SK)
Lenčéš, Z. (SK)
Šajgalík, P. (SK)Number of authors 7 Source Title Journal of the European Ceramic Society. - : Elsevier - ISSN 0955-2219
Roč. 30, č. 9 (2010), s. 1931-1944Number of pages 14 s. Language eng - English Country GB - United Kingdom Keywords Si3N4 ; SiC ; Nano-composites ; Fracture toughness ; Hardness ; Strength ; Creep Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000278172600012 DOI 10.1016/j.jeurceramsoc.2010.03.007 Annotation Dense Si3N4/SiC micro/nano-composites with varying grain boundary phase composition were fabricated by hot-pressing under the same conditions. Six different sintering aids (Lu2O3, Yb2O3, Y2O3, Sm2O3, Nd2O3 and La2O3) were used. The formation of SiC nano-inclusions was achieved by in situ carbothermal reduction of SiO2 by C during the sintering process. Room temperature, fracture toughness, hardness and strength tended to increase when the cation radius of the rare-earth element used in the oxide additive decreased (i.e. from La3+ to Lu3+). The composite material with Lu2O3 sintering additive showed the highest hardness and had reasonably high fracture toughness and strength. The same micro/nano-composite also possessed the highest creep resistance in the temperature range from 1250 ◦C to 1400 ◦C and with loads in the range 50–150MPa. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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