caa a22 4500 388021543 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1557/JMR.1998.0047 doi S0884291400042849 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0047 Microstructural development of Si3N4-SiC-Y2O3 ceramics derived from polymeric precursors [Elektronische Daten] [Si-Y-O-C-N] amorphous powders were synthesized by the pyrolysis at 1000 °C in N2 of chemically modified perhydropolysilazane using n-decyl alcohol and yttrium tri-methoxide. [Si-Y-O-C-N] amorphous powders yielded a unique fibrous microstructure by heat treatment in N2 at 1800 °C. The fibrous microstructure was composed of β-Si3N4 whiskers of submicron in diameter and more than 10 μm in length. Fully dense Si3N4 -SiC-Y2O3 ceramics were also fabricated by heat treatment at 1800 °C followed by powder-vehicle hot pressing at 1700 °C. After these two-step processings, [Si-Y-O-C-N] amorphous powders yielded a unique fine-grained microstructure composed of submicron grains with high aspect ratio. Copyright © Materials Research Society 1998 Iwamoto Yuji Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2-4-1 Mutsuno Atsuta-ku, Nagoya 456, Japan Kikuta Ko-ichi National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya 462, Japan Hirano Shin-ichi Department of Applied Chemistry, School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya 464-01, Japan Journal of Materials Research Cambridge University Press 13/2(1998-02), 353-361 0884-2914 13:2<353 1998 13 JMR https://doi.org/10.1557/JMR.1998.0047 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0047 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Iwamoto Yuji Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2-4-1 Mutsuno Atsuta-ku, Nagoya 456, Japan NATIONALLICENCE 700 1- Kikuta Ko-ichi National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya 462, Japan NATIONALLICENCE 700 1- Hirano Shin-ichi Department of Applied Chemistry, School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya 464-01, Japan NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/2(1998-02), 353-361 0884-2914 13:2<353 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge