Premium
Preceramic Polymer‐Derived SiAlON as Sintering Aid for Silicon Nitride
Author(s) -
Parcianello Giulio,
Bernardo Enrico,
Colombo Paolo,
Lenčéš Zoltan,
Vetrecín Michal,
Šajgalík Pavol,
Kašiarová Monika
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13134
Subject(s) - sialon , sintering , materials science , ceramic , silicon nitride , microstructure , fracture toughness , composite material , pyrolysis , polymer , nitride , toughness , chemical engineering , layer (electronics) , engineering
Two kinds of sintering additives based on the polysiloxanes or polysilazanes filled with nano‐sized powders as SiAlON precursors were tested for the densification of Si 3 N 4 ‐based ceramics. The results showed that both systems can be successfully used as additives for the preparation of Si 3 N 4 ceramics with favorable mechanical characteristics. The ceramics were sintered with 18 wt% of preceramic polymer‐based mixture, and good fracture resistance and high hardness values were obtained after sintering in optimized conditions (temperature, dwell time, nitrogen pressure). Higher densification temperatures and longer holding times were required for sintering of samples with polysilazane‐based precursors. The best toughness values were approximately 5 MPa·m 0.5 , while the highest hardness was about 19 GPa. The differences in mechanical properties of the prepared composites can be related to the phase composition, microstructure and different chemical bonds present in the ceramic residue generated upon pyrolysis and final densification.