TY - JOUR
T1 - Densification behavior and microstructure development in TiB2 ceramics doped with h-BN
AU - Nguyen, Thang Phan
AU - Hamidzadeh Mahaseni, Zahra
AU - Dashti Germi, Mohammad
AU - Delbari, Seyed Ali
AU - Le, Quyet Van
AU - Ahmadi, Zohre
AU - Shokouhimehr, Mohammadreza
AU - Shahedi Asl, Mehdi
AU - Sabahi Namini, Abbas
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - This paper aims to study the impacts of h-BN additive on the microstructural features and sintering behavior of TiB2. For this objective, two different samples of monolithic TiB2 and TiB2-5 wt% h-BN were fabricated using spark plasma sintering (SPS) technique at 1900 °C. An external pressure of 40 MPa was exerted to the specimens during the sintering, and they were maintained at the maximum sintering temperature for 7 min. The characterization of as-fabricated ceramics was carried out using thermodynamical investigations, field emission SEM, and X-ray diffractometer. The thermodynamical and XRD studies revealed that the sintering process was non-reactive for both samples. However, introducing h-BN noticeably promoted the sinterability of TiB2 through activating the liquid phase sintering mechanism, and a near-fully dense composite was attained. The fractographical assessment manifested that the intergranular fracture was the dominant type in both monolithic and h-BN doped specimens. Finally, the quantitative image analysis indicated the role of h-BN in refining the microstructure of the doped TiB2 ceramic.
AB - This paper aims to study the impacts of h-BN additive on the microstructural features and sintering behavior of TiB2. For this objective, two different samples of monolithic TiB2 and TiB2-5 wt% h-BN were fabricated using spark plasma sintering (SPS) technique at 1900 °C. An external pressure of 40 MPa was exerted to the specimens during the sintering, and they were maintained at the maximum sintering temperature for 7 min. The characterization of as-fabricated ceramics was carried out using thermodynamical investigations, field emission SEM, and X-ray diffractometer. The thermodynamical and XRD studies revealed that the sintering process was non-reactive for both samples. However, introducing h-BN noticeably promoted the sinterability of TiB2 through activating the liquid phase sintering mechanism, and a near-fully dense composite was attained. The fractographical assessment manifested that the intergranular fracture was the dominant type in both monolithic and h-BN doped specimens. Finally, the quantitative image analysis indicated the role of h-BN in refining the microstructure of the doped TiB2 ceramic.
KW - h-BN
KW - Non-reactive sintering
KW - Spark plasma sintering
KW - TiB
KW - UHTCs
UR - http://www.scopus.com/inward/record.url?scp=85084194769&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.04.223
DO - 10.1016/j.ceramint.2020.04.223
M3 - Article
AN - SCOPUS:85084194769
SN - 0272-8842
VL - 46
SP - 18970
EP - 18975
JO - Ceramics International
JF - Ceramics International
IS - 11
ER -