TY - JOUR
T1 - Phase evolution during spark plasma sintering of novel Si3N4-doped TiB2–SiC composite
AU - Dashti Germi, Mohammad
AU - Hamidzadeh Mahaseni, Zahra
AU - Ahmadi, Zohre
AU - Shahedi Asl, Mehdi
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/11
Y1 - 2018/11
N2 - Spark plasma sintering process was employed to fabricate TiB2–SiC and novel Si3N4-doped TiB2–SiC ceramic composites at 1900 °C for 7 min under 40 MPa. The microstructural development of TiB2-based composites was significantly influenced by the addition of SiC as a reinforcement phase and Si3N4 as a sintering aid. Thermodynamic assessment, X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy disclosed the in-situ formation of TiC, B4C and SiO2 in both samples as well as TiN and BN in the Si3N4-doped TiB2–SiC sample through the chemical reactions of SiC and Si3N4 additives with the surface oxide impurities of TiB2 particles (TiO2 and B2O3). The elimination of harmful oxide layers and the in-situ formation various secondary phases had remarkable influences on the sinterability and final microstructure of TiB2.
AB - Spark plasma sintering process was employed to fabricate TiB2–SiC and novel Si3N4-doped TiB2–SiC ceramic composites at 1900 °C for 7 min under 40 MPa. The microstructural development of TiB2-based composites was significantly influenced by the addition of SiC as a reinforcement phase and Si3N4 as a sintering aid. Thermodynamic assessment, X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy disclosed the in-situ formation of TiC, B4C and SiO2 in both samples as well as TiN and BN in the Si3N4-doped TiB2–SiC sample through the chemical reactions of SiC and Si3N4 additives with the surface oxide impurities of TiB2 particles (TiO2 and B2O3). The elimination of harmful oxide layers and the in-situ formation various secondary phases had remarkable influences on the sinterability and final microstructure of TiB2.
KW - Microstructure
KW - Phase evolution
KW - SiN
KW - Spark plasma sintering
KW - TiB–SiC
UR - http://www.scopus.com/inward/record.url?scp=85052614580&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2018.08.043
DO - 10.1016/j.matchar.2018.08.043
M3 - Article
AN - SCOPUS:85052614580
SN - 1044-5803
VL - 145
SP - 225
EP - 232
JO - Materials Characterization
JF - Materials Characterization
ER -