TY - JOUR
T1 - Influence of SiAlON addition on the microstructure development of hot-pressed ZrB2–SiC composites
AU - Nguyen, Thang Phan
AU - Ghassemi Kakroudi, Mahdi
AU - Shahedi Asl, Mehdi
AU - Ahmadi, Zohre
AU - Sabahi Namini, Abbas
AU - Delbari, Seyed Ali
AU - Van Le, Quyet
AU - Shokouhimehr, Mohammadreza
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - The impact of SiAlON on densification behavior and microstructure of the ZrB2-SiC composite was investigated. ZrB2, SiC, and SiAlON were used as the initial materials to produce ZrB2-SiC composite by hot pressing at 1900 °C. A fully dense composite was obtained having ~99.9% relative density. High-resolution X-ray diffraction (HRXRD) assessment verified the in-situ formation of ZrC, and the presence of residual carbon, SiAlON, and ZrB2 and SiC phases in the as-sintered ceramic. Furthermore, the thermodynamic calculations confirmed the results attained by HRXRD. In addition, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized for the microstructural investigation. SEM fractographs indicated the impact of SiAlON on the hindering of grain growth and the formation of flaky phases (graphitized carbon or solidified liquid phase) at the grain boundaries. TEM studies revealed the presence of a transparent glassy phase at the particle interfaces. A significant impact of liquid phase sintering was also affirmed in the clean interfaces.
AB - The impact of SiAlON on densification behavior and microstructure of the ZrB2-SiC composite was investigated. ZrB2, SiC, and SiAlON were used as the initial materials to produce ZrB2-SiC composite by hot pressing at 1900 °C. A fully dense composite was obtained having ~99.9% relative density. High-resolution X-ray diffraction (HRXRD) assessment verified the in-situ formation of ZrC, and the presence of residual carbon, SiAlON, and ZrB2 and SiC phases in the as-sintered ceramic. Furthermore, the thermodynamic calculations confirmed the results attained by HRXRD. In addition, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized for the microstructural investigation. SEM fractographs indicated the impact of SiAlON on the hindering of grain growth and the formation of flaky phases (graphitized carbon or solidified liquid phase) at the grain boundaries. TEM studies revealed the presence of a transparent glassy phase at the particle interfaces. A significant impact of liquid phase sintering was also affirmed in the clean interfaces.
KW - Hot-pressing
KW - SiAlON
KW - Silicon carbide
KW - Transmission electron microscopy
KW - Zirconium diboride
UR - http://www.scopus.com/inward/record.url?scp=85084406720&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.04.258
DO - 10.1016/j.ceramint.2020.04.258
M3 - Article
AN - SCOPUS:85084406720
SN - 0272-8842
VL - 46
SP - 19209
EP - 19216
JO - Ceramics International
JF - Ceramics International
IS - 11
ER -