TY - JOUR
T1 - Effects of graphite nano-flakes on thermal and microstructural properties of TiB2–SiC composites
AU - Sadegh Moghanlou, Farhad
AU - Nekahi, Sahar
AU - Vajdi, Mohammad
AU - Ahmadi, Zohre
AU - Motallebzadeh, Amir
AU - Shokouhimehr, Ali
AU - Shokouhimehr, Mohammadreza
AU - Jafargholinejad, Shapour
AU - Shahedi Asl, Mehdi
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - In the last decades, the production of ultra-high temperature composites with improved thermo-mechanical properties has attracted much attention. This study focuses on the effect of graphite nano-flakes addition on the microstructure, densification, and thermal characteristics of TiB2–25 vol% SiC composite. The samples were manufactured through spark plasma sintering process under the sintering conditions of 1800 °C/7 min/40 MPa. Scanning electron microscopy images demonstrated a homogenous dispersion of graphite flakes within the TiB2–SiC composite causing a betterment in the densification process. The thermal diffusivity of the specimens was gained via the laser flash technique. The addition of graphite nano-flakes as a dopant in TiB2–SiC did not change the thermal diffusivity. Consequently, the remarkable thermal conductivity of TiB2–SiC remained intact. It seems that the finer grains and more interfaces obstruct the heat flow in TiB2–SiC–graphite composites. Adding a small amount of graphite nano-flakes enhances the densification of the mentioned composite by preventing the grain growth.
AB - In the last decades, the production of ultra-high temperature composites with improved thermo-mechanical properties has attracted much attention. This study focuses on the effect of graphite nano-flakes addition on the microstructure, densification, and thermal characteristics of TiB2–25 vol% SiC composite. The samples were manufactured through spark plasma sintering process under the sintering conditions of 1800 °C/7 min/40 MPa. Scanning electron microscopy images demonstrated a homogenous dispersion of graphite flakes within the TiB2–SiC composite causing a betterment in the densification process. The thermal diffusivity of the specimens was gained via the laser flash technique. The addition of graphite nano-flakes as a dopant in TiB2–SiC did not change the thermal diffusivity. Consequently, the remarkable thermal conductivity of TiB2–SiC remained intact. It seems that the finer grains and more interfaces obstruct the heat flow in TiB2–SiC–graphite composites. Adding a small amount of graphite nano-flakes enhances the densification of the mentioned composite by preventing the grain growth.
KW - Graphite nano-flakes
KW - Laser flash technique
KW - Microstructure
KW - TiB–SiC composite
UR - http://www.scopus.com/inward/record.url?scp=85078253903&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.01.192
DO - 10.1016/j.ceramint.2020.01.192
M3 - Article
AN - SCOPUS:85078253903
SN - 0272-8842
VL - 46
SP - 11622
EP - 11630
JO - Ceramics International
JF - Ceramics International
IS - 8
ER -