Si3N4-TiN-Y2O3 ceramics derived from chemically modified perhydropolysilazane

Citation
Y. Iwamoto et al., Si3N4-TiN-Y2O3 ceramics derived from chemically modified perhydropolysilazane, J MATER RES, 14(11), 1999, pp. 4294-4301
Citations number
29
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS RESEARCH
ISSN journal
08842914 → ACNP
Volume
14
Issue
11
Year of publication
1999
Pages
4294 - 4301
Database
ISI
SICI code
0884-2914(199911)14:11<4294:SCDFCM>2.0.ZU;2-6
Abstract
[Si-Y-Ti-O-C-N] multicomponent powders were synthesized by pyrolysis at 100 0 degrees C, in NH3 flow, of chemically modified perhydropolysilazane using 4 yttrium triisopropoxide and titanium tetrachloride. [Si-Y-Ti-O-C-N] powd ers yielded uniform and fine-grained Si3N4-TiN-Y2O3 ceramics by heat treatm ent at 1800 degrees C in N-2. The fully densified Si3N4-TiN-Y2O3 ceramics w ere also synthesized by heat treatment at 1800 degrees C, followed by powde r-vehicle hot pressing at 1800 degrees C in N-2. The resulting ceramics rev ealed that TN was dispersed as particles having a size range of about 60-60 0 nm and the fine particles less than 80 nm were dispersed within the beta- Si3N4 matrix grains.